Distributed Control
System
YOKOGAWA
Yokogawa Electric Corporation
2-9-32 Nakacho, Musashino-shi
Tokyo, 180-8750
JAPAN
TRAINING CENTRE
TRAINING CENTRE
YOKOGAWA INDIA LIMITED
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Basic Control Loop
Basic Loop
Transmitter
SV
PV
4-20 mA
I/P
I/P
Convertor
MV
Controller
4-20 mA
Pneumatic Signal
(0.2 to 1 Kg/cm2 or 3 to 15 psi)
Final Control Element
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Process Control Systems
Process control systems are classified into
¾ Analog Control Systems
¾ Digital Control Systems
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Analog Control System
Analog Control System
Operational Amplifier
Transmitter
Signal
Conversion
1 to 5V DC
4-20 mA DC
I/P
Set Point
Final Control Element
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Digital Control System
Digital Control System
Memory
Unit
Control
Unit
1 to 5V DC
A/D
4-20 mA DC
D/A
I/P
Digital
Input
Unit
Output
Unit
Processor
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Arithmetic
Unit
Set
Point
Digital Control System
Digital Control Systems are further classified
into
¾ Centralized Control Systems
¾ Distributed Control Systems
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Centralized Control System
Centralized Control System
Centralized Control , Centralized Monitoring
PV1
Input
Signals
from
Field
PV2
PV3
MV1
Centralized
Processing
MV2
MV3
Unit
PVn
MVn
CPU
SV1 SV2 SV3
SVn
Set Points
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Output
Signals
to
Field
Centralized Control System
Drawbacks Of CCS:
¾ If the CPU fails the entire plant gets affected.
¾ Redundancy concept was not available.
Redundancy is having two controllers. One would be
active and the other would be standby. If the active
controller fails, the standby controller takes over.
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Distributed Control System
Distributed Control System
Distributed Control
PV1
Input
Signals
from
Field
Centralized Monitoring
MV1
Output
Signals
to Field
FCS
PV8
MV8
SV
8
SV1
PV9
MV9
FCS
PV16
OPS
OPS
MV16
SV16
SV9
PV17
MV17
FCS
PVn
MVn
SV17
SVn
Set Points
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Communication
Bus
Basic Components of DCS
FCS (Field Control Station):
Used to control the process. All the instruments and
interlocks created by software reside in the memory
of the FCS. All the field instruments like transmitters
and control valves are wired to the FCS.
OPS (Operator Station):
Used to monitor the process and to operate various
instruments.
Communication Bus:
Used to communicate between the FCS and the OPS
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Advantages of DCS
9 Control function is distributed among multiple CPUs (Field
Control Stations). Hence failure of one FCS does not affect the
entire plant.
9 Redundancy is available at various levels.
9 Instruments and interlocks are created by software.
9 Generation and modifications of the interlocks are very flexible
and simple.
9 Information regarding the process is presented to the user in
various formats.
9 Field wiring is considerably less.
9 Maintenance and trouble shooting becomes very easy.
9 Cost effective in the long run.
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DCS Evolution
CENTUM was released in 1975
as the world-first DCS
(Distributed Control System),
and has been progressed.
CENTUM CS 3000 is
the latest Yokogawa DCS.
From ’98 (1458 Systems)
CENTUM CS
From ’93 (2113 Systems)
CENTUM-XL
From ’88 to ‘00 (1703 Systems)
CENTUM/CENTUM V
From ’75 to ‘93 (1983 Systems)
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As of March ‘03
CS3000 - System Configuration
Ethernet
HIS / ENG
Remote Domain System
HIS
CGW
V net
BCV
CS, CS 1000
CENTUM-XL, -V
MXL
PFCS
ooo
LFCS
FFCS
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KFCS
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CENTUM CS 3000 - Major Components
•
FCS (Field Control Station)
• Reliable controller.
• Cost-effective and capable I/O subsystem.
•
HIS (Human Interface Station)
• The operator station based on Windows XP or Windows2000. (Both
are selectable.)
• HIS provides easy & flexible operation.
•
ENG (Engineering Station)
• Engineering Station is used to do the engineering builder for all the
stations like HIS, FCS, CGW, BCV etc. ENG is a PC loaded with
Engineering software.
• The HIS can be loaded with engineering software so that it can be
used as HIS as well as ENG.
•
CGW: Communication Gateway Unit used to communicate with
supervisory computers.
•
BCV: Bus Converter is used to link two domains.
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CENTUM CS 3000 - Networks
• V-Net (Communication Bus)
• Real-time control bus.
• V-NET is a used for communication between HIS, FCS,
BCV & CGW.
• Maximum 64 Stations can be connected on the V-net.
• ETHERNET (Communication Bus)
• Ethernet is a standard network in CS3000 to connect HIS,
ENG and supervisory computers .
• Transmission speed: 10 MBPS
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FFCS Hardware View
Eight FIO slots
Detachable
bottom unit
EC401 ESB bus coupler
Power supply unit
(Note)
CP401 CPU module
AIP504 Vnet coupler (10BASE2 Vnet cable is used.)
Note: Two I/O slots are to be used for NIU extension.
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Hardware Configuration- Local Node
V net
FFCS
Up to 6
Modules
SB401
SB401
PW48X
PW48X
SB401
SB401
PW48X
PW48X
PW48X
PW48X
Minimum Configuration
ESB bus
SB401
SB401
FIO: Max. 8
PW48X
EC401
EC401
CP401
CP401
PW48X
PW48X
CP401
CP401
PW48X
FFCS
Up to 8
Modules
Maximum Configuration
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Local node
Max. 3
Hardware Configuration – Remote Node
V net
PW48X
EB401
EB401
EB401
EB401
EB401
EB401
CP401
CP401
PW48X
FFCS
Optical Repeater can be used
Expanded Remote node up to 3
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PW48X
PW48X
ER bus
EB501
EB501
PW48X
PW48X
Remote node
EB501
EB501
PW48X
PW48X
Remote node
EB501
EB501
Remote node
HIS (Human Interface Station)
The Station for Real time Plant Monitoring/Operation
Plant Operation by thousands of Graphics
Real time display of Plant Abnormalities.
Easy Operation by a mouse, a keyboard etc.
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Types of HIS
DESKTOP HIS:
A IBM PC/AT compatible machine is generally used. Apart from the general PC,
the Yokogawa PC is also supported. Specifications of the PC HIS Desktop are as
follows:
CPU
: Pentium IV Processor
Main Memory : 256 MB (Minimum)
Hard Disk
: 20 GB or more
Video Display
: 1024 x 768 or more, 256 colours
CRT Monitor
: Multi Scan 17” monitor or larger
Serial Port
: RS232C one port or more
Parallel Port
: One port or more
Extension Slot : PCI slot for V/VL net card, ISA slot for Ethernet card
Power Supply
: 200-240V AC
Basic Software : Windows NT with Service Pack ,Windows 2000 or
Windows XP
CONSOLE HIS
The floor mounted console type HIS comes with 21” monitor which has a touch
panel operation. It has an operation keyboard and an engineering keyboard.
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Application Capacity of HIS
Maximum number of tags that can be
monitored from HIS : 1000000
Maximum number of windows that can be
created per HIS : 4000
Maximum number of Trend Recording Points
per HIS
: 2304
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V net Communication
HIS
V net
Protocol
: IEEE 802.4
Access Control
: Token Passing
Trans. Speed
: 10 Mbps
Trans. Distance
: 500m to 20km
Media
: Coaxial/Optical Fibre
Std. max. length
: 185 m
Max. length
: 20 Km (with optical
repeater) 1.6 Km (with coax. repeater)
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HIS
V net : Extension Details
HIS
HIS
HIS
Optical
Fibre
Optical
Fibre
T
R
R
R
R
T
T
R
R
R
R
T
V net
Max. 500m
Max.
15 km
Max. 500m
Max.
15 km
Overall Max. 20 km
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Co-axial Cable
Max. 500m
Bus Convertor
ETHERNET
EOPS
HIS
Domain
connection
V-NET
HF BUS
BCV
EFCD
FCS
ooo
ooo
ooo
Domains are group of stations connected on the V-net.
Bus Convertor is used to link two domains.
BCV is used to connect CS, CS 1000, CENTUM-XL,CENTUM-V AND MXL to CS3000
system
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Operation Windows
Information regarding the process is gathered as well
as monitored by the following Standard Operation
windows on the HIS.
•
•
•
•
•
•
•
•
•
Tuning Window
Control Group Window
Trend Window
Process Alarm Window
Operator guide Message Window
Graphic Window
Overview Window
Process Report Window
Historical Report Window
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System Message Window
These buttons are provided for
calling various functional
windows on the HIS
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Type the TAGNAME to call
the instrument faceplate
window
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System Message Area
SYSTEM MESSAGE AREA ICONS
Various windows can be
accessed by selecting
the respective icons in the
System Message Area
These windows can also be accessed by the keys
on the Operator Keyboard
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Operation Keyboard
OPERATION
KEYBOARD
Operation Keyboard
All the operations can be performed with the help
of the Operation Keyboard. The same
operations can also
be performed by touch functions available
on the System Message Area Icons.
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Operation Windows
From this window, you can open the
following windows.
1. Overview Window
2. Control Window
3. Tuning Window
4. Trend Window
5. Graphic Window
6. Alerm Window
7. Operator Guide message
Window
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Instrument Faceplate Window
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Tuning Window
Select this icon to display
the Tool box
Select this icon to display
the Tuning Window
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Tuning Window
TUNING WINDOW displays all the
Tuning parameters of the instrument.
The Tuning Window is used to set up the
alarm setting as well as the loop tuning
parameters.
Only the items indicated with a “= “ can
be changed.
Displaying a “Tuning Window”
1.Double click on a Tag’s name on a
“Control Window” and a faceplate window
will appear. Select the “Tuning “
window icon from the toll box.
2. Select “NAME icon in the System Message
Area” then enter the “TAGNAME”.
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Tuning Window
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Mode Status
MAN (Manual)
AUT (Auto)
CAS (Cascade)
PRD (Primary Direct)
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Manual Mode
MANUAL MODE:
In manual mode, the MV pointer
appears in red colour and the SV pointer
appears in yellow colour. MV of the
instrument can be changed by
increment/decrement keys or through
data entry box. The SV of the
instrument can be changed either by set
point change key or using ITEM and
DATA in the data entry box.
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Auto Mode
AUTO MODE:
In auto mode, the SV pointer appears in
red colour and the MV pointer appears
in yellow colour. SV of the instrument
c a n
b e
c h a n g e d
b y
increment/decrement keys or through
data entry box. The MV of the
instrument cannot be changed by any
method.
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Cascade Mode
CASCADE MODE:
In a cascade loop the output of the primary
controller (MV1) goes as set point of the
secondary controller (SV2). The output of
the secondary controller (MV2) goes to
the final control element. For a cascade loop,
the primary controller can be in AUT or MAN
mode, but the secondary controller has to be
in CAS mode. In cascade mode both the SV
and MV pointers appear in yellow colour.
The SV and MV of the instrument cannot
be changed.
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Primary Direct Mode
PRD: PRIMARY DIRECT MODE
In a normal cascade loop the output of the
primary controller (MV1) goes as set point of
the secondary controller (SV2). The output
of the secondary controller (MV2) goes
to the final control element.
In PRD mode the output of the primary
controller (MV1) directly goes to the final
control element. The secondary controller is
bypassed and cannot be operated.
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Selecting/Deselecting PRD Mode
To select PRD mode:
Go to the tuning window of the Secondary
controller.
Select PRD Icon. Confirm.
To select CASCADE mode:
Change the mode status of the secondary
controller to CAS.
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Mode Sub Status
IMAN (INITIALIZATION MANUAL
MODE)
In a cascade loop, if the cascade is
broken by taking the secondary
controller from CAS to either AUT or
MAN mode, IMAN appears as the mode
sub status of the primary controller.
IMAN indicates that
– Cascade loop is broken
– Primary controller is bypassed
– Primary controller cannot be operated due
to SV tracking.
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SV Tracking
SV tracking:
The output of the primary controller
(MV1) automatically tracks the set point
of the secondary controller (SV2) to
have bumpless transfer to CAS mode.
To bring the primary controller out of
IMAN mode
Change the mode status of the
secondary controller to CAS. The
primary controller will automatically
c o m e
o u t
o f
I M A N
mode.
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Clamped Positive
CLP+ (CLAMPED POSITIVE)
In auto mode, if MV of the instrument is
increased beyond MH value, MV gets
clamped at the MH value and C appears
on the instrument faceplate .
MHI alarm also appears on the
instrument as well as in the Process
Alarm Window.
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Clamped Negative
CLP- (CLAMPED NEGATIVE)
In auto mode, if MV of the instrument is
decreased below ML value, MV gets
clamped at the ML value and C appears
on the instrument faceplate.
MLO alarm also appears on the
instrument as well as in the Process
Alarm Window.
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Process Alarm Status
ALARM STATUS
PROCESS
STATUS
ALARM
ITEM TO BE
SET IN THE
TUNING
SETTINGS
PV BAR
COLOUR
TAG MARK
COLOUR
REMARKS
PANEL
NR
PROCESS
NORMAL
----------
----------
GREEN
GREEN
----------
HH
PV VERY
HIGH
PV > HH
HH
RED
RED
----------
HI
PV HIGH
PV > PH
PH
RED
RED
----------
LL
PV VERY
LOW
PV < LL
LL
RED
RED
----------
LO
PV LOW
PV < PL
PL
RED
RED
----------
DV+ / -
DEVIATION
ALARM
DV > DL
DV = PV - SV
DL
DEVIATION
LIMIT
YELLOW
YELLOW
VEL + / -
VELOCITY
ALARM
VEL =
VL
VELOCITY
LIMIT
YELLOW
YELLOW
IOP + / -
INPUT
OPEN
INPUT IS OUT
OF RANGE
CHECK RAW
VALUE IN
TUNING
WINDOW
RED
RED
OOP
OUTPUT
OPEN
OUTPUT LINE IS
OPEN
RED
RED
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PV/
T
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RAW IS
ACTUAL INPUT
INTERMS OF %
Process Alarm Status
ALARM STATUS
PROCESS
STATUS
ALARM
SETTINGS
ITEM TO BE
SET IN THE
TUNING
PV BAR
COLOUR
TAG MARK
COLOUR
REMARKS
PANEL
MHI
MV HIGH
MV > MH
MH
YELLOW
YELLOW
OCCURS ONLY
IN CAS/ AUTO
MODE
MLO
MV LOW
MV < ML
ML
YELLOW
YELLOW
OCCURS ONLY
IN CAS/ AUTO
MODE
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Alarm Sub Status
AOF (Alarm Output Off)
CAL (Calibration)
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Alarm Sub Status
AOF (Alarm Output Off)
Normally when an alarm occurs
• The tag mark changes colour depending on the type
of the alarm.
• Audible alarm is heard.
• The alarm status (HI/LO/HH/LL etc…) is displayed
on the process alarm window.
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Alarm Sub Status
AOF (Alarm Output Off)
In AOF mode:
The tag mark changes to dark blue colour irrespective
of the alarm.
Audible alarm is put off.
The alarm status is displayed only on the instrument
faceplate.
All the alarms status except IOP & OOP on the
Instrument are not displayed on the process alarm
window.
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Selecting / Deselecting AOF
To put the instrument to AOF mode:
Go to the tuning window of the instrument.
Select AOF icon. Confirm.
To bring the instrument back to normal
mode:
Go to the tuning window of the instrument.
Select AOF icon once again. Confirm.
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Alarm Sub Status
CAL (Calibration)
When an instrument is put in CAL mode
• CAL appears on the instrument faceplate.
• The PV bar changes to cyan colour.
• The Instrument automatically comes to MAN mode.
• The actual transmitter input is bypassed.
• PV of the instrument can be changed.
• All the alarms checking on the instrument are
bypassed.
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Selecting / Deselecting CAL
To put an instrument in to CAL mode:
Go to the tuning window of the instrument.
Select CAL icon. Confirm.
To bring the instrument back to normal
mode:
Go to the tuning window of the instrument.
Select CAL icon once again. Confirm.
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Importance Level
Importance level is assigned to an
instrument when it is created in the
engineering builder. There are 8 importance
levels.
1 – Important tag with confirmation
5 – Important tag without confirmation
2 - General tag without confirmation
6 - General tag with confirmation
3 - Auxillary tag –I without Confirmation
7 - Auxillary tag –I with Confirmation
4 - Auxillary tag –II without Confirmation
8 - Auxillary tag –II with Confirmation
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Security Level
Security level is assigned to an instrument
when it is created in the engineering builder.
There are 8 security levels.
Tuning Parameters are displayed with = or :
depending on the security level.
Parameters displayed with = can be
changed in the current key position.
Parameters displayed with : cannot be
changed in the current key position.
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Security Level
KEY POSITION/
MONITORING
OPERATION
ACCESS LEVEL
FACEPLATE DISPLAY
FACEPLATE OPERATIONS,
PROCESS DATA INPUT
OPERATIONS
OFF
ON
ENG
OFF
ON
ENG
1
O
O
O
O
O
O
2
O
O
O
*1
O
O
3
O
O
O
*2
O
O
4
O
O
O
X
O
O
5
O
O
O
X
X
X
6
X
O
O
X
X
O
7
X
X
O
X
X
X
8
X
X
X
X
X
X
O : Can be executed
X : Cannot be executed
*1 : Only the PV alarm settings, SV, MV and block mode can be changed
* 2 : Only the SV, MV and block mode can be changed
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Control Drawing Display
Select this icon to
call the Control
Drawing display
Control drawing display
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Control Group Window
Select this icon to display
the Tool box
Select this icon to display
the Control Group
Window
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Control Group Window – 8 Instruments
Control group windows are used to
display multiple instrument faceplates.
Maximum 8 or 16 instrument faceplates
can be displayed in one Control Group
Window
Normally the instruments are monitored and
operated from this window.
Double click on the instrument TAGNAME to
display the Tuning Window of the instrument.
Select the Upper Window Key to come back to
Control Group Window
.
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Control Group Window – 16 Instruments
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Trend Window
Select this icon to display
the Tool box
Select this icon to display
the Trend Window
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Trend Window
TREND WINDOW records the PV, SV and
MV of various instruments.
Trend can be displayed in Trend Group
Format or in Trend Point Format.
Maximum 8 pens can be assigned in one
Trend Group Window
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Trend Group Window
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Trend Point Window
Double click here
to call the Trend
Point Window
Trend Point
Window
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Calling Instrument from Trend Window
Double click here
to call the
Instrument
faceplate
Window
Instrument
Faceplate
Window.
Instrument can
be operated from
this window.
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Process Alarm Window
Select this icon to call the
Process Alarm Window
PROCESS ALARM WINDOW displays the
latest 200 process alarms.
Alarms can be acknowledged either as a
Group or as Individual alarm.
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Process Alarm Window
This icon displays the current
PV Values of the instruments
that are in alarm
This icon is used to acknowledge
the process alarms.
This icon displays the important
tags (High Priority Alarms) that
are in alarm.
PROCESS ALARM WINDOW displays the
latest 200 process alarms.
Alarms can be acknowledged either as a
Group or as Individual alarm.
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Operator Guide Message Window
Select this icon to call the
Operator Guide Message
Window
OPERATOR GUIDE MESSAGE WINDOW
displays the predefined messages to guide
the operator regarding the current process
status and /or the actions to be taken.
OG messages can be acknowledged either as a
Group or as Individual message.
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Graphic Window
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Overview Window
Select this icon to display
the Tool box
Select this icon to display
the Overview Window
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Overview Window
Overview Window displays the overview of the
current process status.
Information regarding the process is distributed
among the various display blocks.
32 Display Block s per Overview Window.
Each block gives dynamic information regarding the
process.
Double click on the display block to more details.
3 Types of Display Blocks
•Single Tag Block
•Window Display Block
•Comment Block
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Overview Window
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Process Report Window
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Historical Message Report Window
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Sequence Tables
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Sequence Tables
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Logic Charts
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Logic Charts
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System Status Window
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System Alarm Window
SYSTEM ALARM WINDOW displays the
latest 100 system alarms.
Alarms can be acknowledged either as a
Group or as Individual alarm.
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Navigator Window
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Digital Inputs
System Code : %ZnnusccSddss
%Z - Process Input/Output
S - Station
nn - node number
dd - Domain number
u
- I/O unit number
ss - Station number
s
- Slot number
cc - Channel number
Digital Inputs are contact inputs from field to CS3000.
Digital Inputs are used to indicate the
i) ON / OFF status of pumps, motors, heaters, etc.
ii) OPEN / CLOSE status of on-off valves. Digital Inputs are used
only as a condition signal in the Sequence Table. They cannot be
used as an action signal in Sequence Table.
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Digital Inputs Syntax
Conditions
TAGNO.PV.ON
Y
N
DI = OFF
PV = 0
PV=1
DI=ON
VALVE
PV=1
DI=1
Contact is closed in field
OPEN
PV = 0
DI = 0
CLOSE
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Contact is open in field
Digital Outputs
System Code : %ZnnusccSddss
%Z - Process Input/Output
S - Station
nn - node number
dd - Domain number
u
- I/O unit number
ss - Station number
s
- Slot number
cc - Channel number
Digital Outputs are contact outputs from CS3000 to field.
Digital Outputs are used to
i) Switch ON / OFF pumps, motors, heaters etc
ii) OPEN / CLOSE on-off Valves.
Digital Outputs can be used as condition signals or as action signals
in sequence table. If Digital Output is specified as Latched i.e. H, it
has to be made ON on a particular condition and has to be made OFF
on another condition
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Digital Outputs Syntax
PUMP
PV=1
DO=1
OFF PV = 0
ON
Condition
Output relay is
energised
TAGNO.PV.ON
N
Y
CO1
Y
Y
ON PV = 1
N
Y
TAGNO.PV.L
PV=0
DO=0
Output relay is
deenergised
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Action
OFF
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Y
Y
TAGNO.PV.H
Y
TAGNO.PV.P
Y
N
ON PV=1
OFF PV=0
Latch & Unlatch
Whenever Digital Outputs, Switches and Annunciators are used in
sequence table as an action signal, they have to be specified as L (or) H
Input
Start
Output
Unlatched (L)
(level triggered)
Stop
R-1
Start
Output
Latched (H)
(edge triggered)
Stop
R-1-1
(Latching or hold on contact)
Output pulse (P)
The O/P is turned ON only once, for approx..1sec. When condition is true.
If the condition goes false and then true again,output is turned ON again
for a second.
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Switches
Switches are classified into Global switches and Common Switches.
Global Switches are common to all FCS. The status of global switches
are transmitted to other FCS through link transmission. Hence they can
be set and referred in any FCS.
Common Switches are used to within the FCS. They are specific to each
FCS.
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Global Switches
Max.256 GS/FCS
System Code: %GSxxxxSddss
%GSxxxx - Switch number (0001 - 0256)
dd
ss
- Domain number
- Station number
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Common Switches
Max.4000 SW/FCS
System Code: %SWxxxxSddss
%SWxxxx - Switch number (0001 - 4000)
dd
ss
- Domain number
- Station number
Switches are used to store intermediate variables in the interlocks.
Switches are internal flags that can be set and reset whenever required.
Switches are used for auto / man selection, pump selection, speed
selection, bypass selection etc..
Switches No. 1 - 200 are used by the system. Hence the user can use
switches from 201 - 4000.
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Switches Syntax
Condition
TAGNO.PV.ON
Action
Y
N - PV=0, SW=OFF
PV=1, SW=0N
N
CO1
Y
TAGNO.PV. L
Y
TAGNO.PV.H
Y
N- PV=0
TAGNO.PV.P
Y
PV=1
BYPASSSW
PV=1,
SW=ON
BYPASS
PV=0,
SW=OFF
NORMAL
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Timer
Timers are used to introduce time delays in Sequence Table.
Second timer
Timer Types
Minute timer
Max time - 9999 secs (or) 9999 Mins.
PH = Maximum time the timer should count
PV = Actual time the timer has counted
DV = PH-PV i.e.the time left to finish counting
DL = Deviation limit
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Timer Operation
1. When the timer is started, PV starts incrementing
automatically
Alarm status is NR
2. When the timer has finished timing, i.e. when PV = PH
Alarm status is CTUP
3. When the timer is stopped while timing
status is STOP
Alarm
4. When the timer is paused while timing
PAUS
Status
5. When the DV < DL
is
alarm status is PALM
Any of the alarm status can be referred in sequence table
as a condition signal.
90
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Counter
Used to count internal events or external pulses.
Counter PV updates by one every time the counter is
started
INT - Internal counter
Counter types
P - Pulse counter
Max.9999 Counts
Counter operation is same as timer except that pause
option is not available.
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Operator Guide Messages
Operator Guide Messages are used to guide the operator
regarding the current process status and/or the actions to be
taken. Operator Guide messages are also activated through
sequence table on a specific condition. Operator Guide
messages appear on operator guide message panel.
System Code: %OGXXXX
Condition
CO1
Y
%OGXXXX.PV.NON
Y
Action
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Message
Annunciator messages are user defined alarms. Annunciator
messages are also activated through sequence table on a
specific condition. Annunciator messages appear on Alarm
Summary Panel.
System Code: %ANxxxxSddssaa
Condition
CO1
Y
N
C02
Action
%ANXXXX.PV.L
%ANXXXX.PV.H
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Y
Y
N
Sequence Instruments
Sequence instruments (or) status input output instruments
are used to
i) Switch ON/OFF motors, pumps, heater etc..
ii) OPEN / CLOSE on-off valves
iii) Indicate the ON/OFF status of motors, pumps, heaters
etc.
iv) Indicate the OPEN/CLOSE status of on-off valves.
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Model SO-1
One DO is linked with the instrument.
Loop Connection
Condition
Tag No.
OPEN
MV = 2
DO = ON
C01 Y
SO - 1
C02
SI0 Model
OUT
Action
TAGNO.CSV.2
Wiring
CLOSE
MV = 0
DO = OFF
DOTAGNO.PV
(OR) %Znnuscc
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Y
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TAGNO.CSV.0
PIO
Y
Y
Model SO-2
Two DO’s are linked with the instrument.
Loop Connection
Condition
Tag No.
OPEN
MV = 2
DO1 = ON
SO - 2
C01
Y
Action TAGNO.CSV.0
Y
TAGNO.CSV.1
Y
TAGNO.CSV.2
Y
SI0 Model
OUT
MV = 1
DO1 = OFF
D02 = OFF
Wiring
DOTAGNO.PV
PIO
(OR) %Znnuscc
CLOSE
MV = 0
DO2 = ON
This DO number and the next consecutive
DO number will be taken as the 2 output
signals automatically.
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Model SI-1
One DI is linked to the instrument.
Condition
Tag No.
OPEN
PV = 2
DI = ON
TAGNO.PV.2
TAGNO.PV.0
SI - 1
IN
Action
CLOSE
PV = 0
DI = OFF
DITAGNO.PV
(OR)
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%Znnuscc
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PIO
Y
Y
Model SI-2
Two DI’s are linked to the instrument.
Condition
Tag No.
OPEN
PV = 2
DI1 = ON
TAGNO.PV.0
TAGNO.PV.1
SI - 2
Y
Y
TAGNO.PV.2
Y
IN
TRAVERSE
PV = 1
DI1 = OFF
DI2 = OFF
Action
DITAGNO.PV
PIO
(OR) %Znnuscc
CLOSE
PV = 0
DI2 = ON
This DI number and the next DI number
will be taken as the 2 answerback inputs.
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Model SIO-11
1 DI and 1 DO is linked to the instrument.
Output
Signal
Answerback
Signal
PV = 2
DI = ON
MV = 2
DO = ON
Condition
Tag No.
IN
SI0 - 11
START
TAGNO.PV.0
TAGNO.PV.2
TAGNO.ALRM.ANS+
TAGNO.ALRM.ANS-
Y
Y
Y
Y
TAGNO.MODE.AUT
TAGNO.MODE.MAN
TAGNO.CSV.2
TAGNO.CSV.0
Y
Y
Y
Y
OUT
Action
DOTAGNO.PV
PV = 0
DI = OFF
MV = 0
DO = OFF
DITAGNO.PV
STOP
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Model SIO-21
2 DIs and 1 DO are linked to the instrument.
Condition
MV = 2
DO = ON
PV = 2
DI1 = ON
TAGNO.PV.2
TAGNO.PV.1
TAGNO.PV.0
Y
Y
Y
TAGNO.MODE.AUT
TAGNO.MODE.MAN
TAGNO.CSV.0
TAGNO.CSV.2
Y
Y
Y
Y
Tag No.
OPEN
SI0 - 21
PV =10
DI1 = OFF
DI2=OFF
IN
OUT
Action
TRAVERSE
DITAGNO.PV
PV = 0
DI2 = ON
MV = 0
DO = OFF
DOTAGNO.PV
First DI No. will be taken as the first answerback signal.
Next DI No. will be taken as the second answerback signal.
CLOSE
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Model SIO-12
1 DI and 2 DOs
Condition
MV = 2
DO1 = 0N
PV = 2
DI = ON
SI0 - 12
MV =1
D01 = OFF
D02=OFF
IN
OUT
STOP
DITAGNO.PV
PV = 0
DI = OFF
Action
TAGNO.MODE.AUT
TAGNO.MODE.AUT
TAGNO.CSV.0
TAGNO.CSV.1
TAGNO.CSV.2
Y
Y
Y
Y
Y
DOTAGNO.PV
First DO No. will be taken as the first output signal.
Next DO No. will be taken as the second output signal.
REVERSE
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Y
Y
Tag No.
FORWARD
MV = 0
DO2 = ON
TAGNO.PV.0
TAGNO.PV.2
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Model SIO-22
2 DI’s and 2 DO’s
Condition
MV = 2
DOI = ON
PV = 2
DI1 = ON
SI0 - 22
PV = 1
DI1 = OFF
DI2 = OFF
IN
Action
OUT
STOP
DITAGNO.PV
First DI No.
MV = 0
DO2 = ON
DOTAGNO.PV
First DO No.
PV = 0
DI2 = ON
PUMP 2
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Y
Y
Y
TAGNO.MODE.AUT
TAGNO.MODE.MAN
TAGNO.CSV.0
TAGNO.CSV.1
TAGNO.CSV.2
Y
Y
Y
Y
Y
Tag No.
PUMP 1
MV =1
DO1 = OFF
DO2=OFF
TAGNO.PV.2
TAGNO.PV.1
TAGNO.PV.0
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Sequence Tables
Interlocks are written in the form of sequence table.
Each S.T. has 32 conditions, 32 actions and 32 rules.
General Rules:
Actions will be performed only if all the conditions in the
rule are satisfied. Even if one condition is not satisfied,
actions will not be performed.
Condition Signal: Y/N
Colour:
Red: Condition is true (satisfied)
Cyan: Condition is false (not satisfied)
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Sequence Tables
1
2
3
4
32
Conditions
C01
C02
|
|
C32
Actions
A01
A02
|
Band Colour :
|
Red : All the conditions in the
rule are satisfied.
Green : All the conditions in the
rule are not satisfied.
A32
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Virtual test Function
TEST
SYSTEM GENERATION
FUNCTION
FUNCTION
OPERATION
&
MONITORING
FUNCTION
CONTROL FUNCTION
FUNCTION
SFCS
HUMAN INTERFACE STATION
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Thank you very much for
your attention.
YOKOGAWA INDIA LIMITED
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