LIEBERT® SITEIO-E™ SSW-28IOE™
Product Specification
Description
The Liebert SSW-28IOE is a
general-purpose IO module that can be
used to control multiple pieces of
equipment simultaneously.
The unit comes assembled and installed
in an enclosure; see Enclosure
Mounting Diagrams on page 2 and 3.
The 32-bit microprocessor-based device is
designed to monitor up to 28 analog,
digital and/or dry contact signals and
control up to four outputs. These outputs
can be any combination of analog and
digital.
The outputs are controlled through
custom programming defined by the user. These outputs support manual control override
capabilities through switches on the module. Individual hardware jumpers set input signal-type
selections. Screw terminal blocks are provided to terminate power, input and output signal wiring.
Module Dimensions and Layout
11.295" (286.9mm)
.23" (5.84mm)
.23" (5.84mm)
1.25"
(31.75mm)
2.5"
(63.5mm)
7.5"
(190.5mm)
2.5"
(63.5mm)
1.25"
(31.75mm)
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Enclosure Mounting
The enclosure may be mounted on a wall or on the floor. Refer to the following diagrams for
your application.
Enclosure Mounting Diagrams
0.88"
(22.2mm)
0.88"
(22.2mm)
12.5" (317.5mm)
1" (25.4mm)
1" (25.4mm)
A
11"
(279.4mm)
11"
(279.4mm)
1"
(25.4mm)
1" (25.4mm)
12.5" (317.5mm)
R 0.107"
(2.71mm)
0.88"
(22.2mm)
0.4"
(10.2mm)
DETAIL A
2
R 0.188"
(4.76mm)
0.88"
(22.2mm)
Enclosure Mounting Diagrams (continued)
14.25" (362mm)
12"
(304.8mm)
3.35"
(85mm)
B
3.92"
(99.6mm)
1.15"
(29.3mm)
1.25"
(31.8mm)
1.5"
1.5"
(38.1mm) 1.5" (38.1mm)
(38.1mm)
5.88" (149.2mm)
5.25"
(133.4mm)
2.5"
(63.5mm)
1.5"
(38.1mm)
1.5"
0.6"
1.5" (38.1mm) (15.1mm)
(38.1mm)
5.88" (149.2mm)
3
1.13"
(28.6mm)
0.88"
(22.2mm)
DETAIL B
Specifications
Power
24VAC ±10%, 50-60Hz, 95VA; 26VDC ±10%, 44W
Dimensions
W x D x H: in. (mm)
Overall:
7-1/2 x 2-3/4 x 11-5/16 (190.5 x 70 x 287)
Weight, lb. (kg)
12.2 (5.53)
Communication
•
•
•
Mounting:
5 x 2-3/4 x 10-13/16 (127 x 70 x 275)
One (1) Ethernet 10/100BaseT RJ-45 port for BACnet/IP communication, half duplex
BACnet Support: Conforms to the Advanced Application Controller (B-AAC) Standard Device Profile as
defined in ANSI/ASHRAE Standard 135-2004 (BACnet) Annex L
Rnet: Local laptop and/or BACview access port. Conforms to the BACnet Advanced Application
Controller (B-AAC) Standard Device as defined in BACnet 135-2001 Annex L.
Inputs
28 Inputs, configurable for 0-5VDC, 0-10VDC, 0-20mA, RTD, thermistor or dry contact
Input Resolution
14 bit A/D
Input Pulse Frequency
40 pulses per second. Minimum pulse width (on or off time) required for each pulse is 25 msec
Outputs
4 outputs for 24VDC relay driver, 0–10 VDC (minimum resistance to ground must be 500 Ohms), or 0-20 mA
(maximum resistance to ground must be 800 Ohms)
(Device must share same ground as the control module; total output current from all outputs and Aux Power
Out connection must not exceed 400 mA at 125°F [52°C] or 300 mA at 140°F [60°C]
Output Resolution
12 bit D/A
Microprocessor
32-bit Motorola Power PC microprocessor with cache memory, Fast Ethernet controller, high-performance
32-bit communication co-processor and I/O expansion CAN co-processor
Memory
16 MByte non-volatile battery-backed SDRAM (12 MBytes available for use)
8 MByte flash memory, 32-bit memory bus
Real-Time Clock
Battery-backed real-time clock keeps track of time in event of power failure
Environmental
Operating Range
20°F to 140°F (-29°C to 60°C); 10 to 90% relative humidity, non-condensing.
Note: Control modules should be installed within the building.
Protection
Built-in surge and transient protection circuitry for power, network, input, and output connections; Incoming
power is protected by a replaceable 3A fuse. Automatically resetting internal solid-state polyswitches protect
network connections. The power, network, input and output connections are also protected against voltage
transient and surge events.
Battery
10-year Lithium CR123A battery provides a maximum of 720 hours data retention during power failures. To
extend battery life, battery backup turns off after a number of days defined in the module driver.
Agency Listings
UL-916 (PAZX), cUL-916 (PAZX7), FCC Part 15-Subpart BClass A, CE EN50082-1997
Wiring Specifications
Max. Wire
Connection Length, ft. (m)
Ethernet
10 BaseT
Signal Type
Gauge,
Min.
Signal
Type
Description
328 (100)
(CAT5)
N/A
Thermistor 1
Precon type 2 (10 kOhm at 77°F). Input voltages should be from 0.489 to
3.825VDC for thermistors.
Thermistor
Dry Contact
1000 (305)
22 AWG
Dry contact
A 5VDC wetting voltage detects contact position, resulting in a 1 mA maximum
sense current when the contacts are closed
0–5 VDC
1000 (305)
26 AWG
0–5 VDC
0-10VDC
Source Output Impedance: <200Ohms
Input Impedance: 20kOhm
0–10 VDC
1000 (305)
26 AWG
0–20 mA
Input resistance on the positive (+) terminal: 250 Ohms
Aux Power Out terminal is capable of supplying 24VDC to multiple 4– 20 mA
transducers; total current demanded must not exceed 200 mA
Ext. power supply required if voltage measured from the Aux Power Out terminal to
Gnd is less than 18VDC
0–20 mA
3000 (914)
26 AWG
RTD 1
Platinum - 1 kOhm at 32°F (0°C)
Nickel/Iron - 1 kOhm at 70°F (21°C)
Balco TS8000 - 1 kOhm at 70°F (21°C)
Input voltages should be from 0.6–1.2 V.
100 (30)
22 AWG
RTD
Pulse
Pulse counting up to 40 pulses per second. Minimum pulse width (on or off time)
Counter 2
required for each pulse is 25 msec
1. To use a thermistor or RTD not listed above, a custom translation table for the sensor must be
set up.
2. Liebert Site IO-E can perform pulse counting for dry contact or voltage inputs if input is
assigned to a Pulse to Analog Input microblock.
Liebert Corporation
1050 Dearborn Drive
P.O. Box 29186
Columbus, OH 43229
Telephone: 1-800-877-9222
Facsimile: 1-614-841-6022
www.liebert.com
© 2011 Liebert Corporation
All rights reserved throughout the world. Specifications subject
to change without notice.
® Liebert and the Liebert logo are registered trademarks of
Liebert Corporation. All names referred to are trademarks or
registered trademarks of their respective owners.
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