The VARAN Bus
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The VARAN Bus, the Real-Time Ethernet Bus System
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LASAL Highlights at a Glance
The VARAN Bus, the Real-Time Ethernet Bus System
 Hard real-time
 Cycle times < 100 µs and jitter < 100 ns
High data security
 For use in harsh industrial environments
 Short packet lengths up to a max. of 128 bytes
Flexible network principle
 Line, star and tree structures can be combined as desired.
 Modular machine structures
 Low system costs
 Use of inexpensive standard components
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VARAN Function Principle
Uses the Manager/Client Principle
 Guaranteed data consistency with reconfirmation of each message
 Distributed clocks are not required: synchronization with a PLL mechanism
Cycle time < 100 µs
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VARAN Function Principle
Various Tasks for Various Jobs
 Standard Ethernet packets are tunnelled
 Maximum protection against
unauthorized access!
 No firewall needed!
 Asynchronous direct access during the bus cycle
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VARAN Function Principle
VARAN Frame vs. Standard Ethernet Frame
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The VARAN Bus Speaks Safety
The VARAN Bus, Integrated Safety
 Black channel principle
 Decentralized Safety solutions
 SIL-3, IEEE 61508, PL e
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VARAN Function Principle
The VARAN Bus is Simple
 Automatic
addressing
 Simple
function
 Simple
instruction sets
 Data exchange over a
common address
range
 Up to 65,280
participants
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VARAN Function Principle
Components of a VARAN Connection
 VARAN protocol executed completely in the hardware
 Inexpensive standard components are used
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VARAN Function Principle
Electronic type label
 Unique identification for each participant
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Performance Characteristics
The VARAN Bus: Access Times
Bus cycle times
< 100 µs
Isochronous access time
2.18 µs
8 I/Os = 1 byte
5.05 µs
1 drive
16 bytes r/w
Asynchronous direct access
< 25 µs
Synchronicity-inaccuracy
< 100 ns jitter
128 bytes
Portable to Gigabit Ethernet without protocol
changes
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Data Security
High Data Security
 Industrial environment affected by disruptions
 When data is lost: Data is resent in the same bus cycle
Communication during an error
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Function principle
Flexible Network Principle
 Hot-Plug capability
 Automatic addressing
 Electronic type label
 Only 1 IP address per machine
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Function Principle
Synchronous Multi-Manager Systems
 Modular configuration of production lines
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VARAN BUS USER ORGANIZATION
VNO, Strong Together
VARAN BUS USER ORGANIZATION e.V.
 Founded in 2006, registered organization, independent
 The VNO holds the rights to the open VARAN bus technology
 Control-independent
 Unlimited VARAN technology user rights for members
 Defined connection technology
 Cooperation with organizations such as VDMA. CiA
 CANopen® mapping in VARAN
 Consultation, maintenance and development of the standard
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What is the VARAN Bus
The VARAN bus, the Real-Time Ethernet Bus System
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VARAN bus Connection Technology
The VARAN Bus, the Optimal Connection
 Industrial RJ45 (IP 20) connector
 Signal and power supply with hybrid cable
 M12 connector plug (IP67) up to 2 A
 8+4 power / Ethernet connection technology (IP67) up to 10 A
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Topology Examples
From the Smallest Sensor to the World Wide Web
Internet
Office / control level
Field level
Injection molding
machine
Injection molding
machine
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Handling
Handling
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Topology Examples
Modular Machine Construction with Central Controls
Central control
Control
computer
Service PC
Switch
TCP / IP
TCP / IP
VARAN
Injection moulding
machine
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Robot
The VARAN Bus, the Real-Time Ethernet Bus System
Conveyor
system
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Topology Examples
VARAN Bus in the Machine
TCP / IP
DVI
Length measuring
systems
TCP / IP
VARAN
VARAN
Multi Manager
Hydraulics
TCP / IP
VARAN
Drives
Temperature
control unit
Service Laptop
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The VARAN Bus, the Real-Time Ethernet Bus System
Sensors
I/O Modules
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Application Example
Package Sorting System TNT Distribution Centre
 Developed by VAN-RIET, Dutch specialist for material
handling systems
 Production increase of 80% compared to the current field bus
solution
 9,000 packages sorted per hour
 Minimum runtime: under 1 ms
 Update time < 200 µs
 Maximum scan rate with 128 VARAN digital mixed modules
=> corresponds to a maximum of 1024 I/Os networked with the VARAN bus
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Application Example
TNT Distribution Centre Package Sorting System
 Schematic diagram
Light barrier
Spring or
air actuator
(Max. 128 VDM)
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Application example
TNT Distribution Centre Package Sorting System
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VARAN Bus
With the VARAN bus you increase
performance
and data security
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