Concurrent Communication
Concurrent communication provides seamless failover for any redundant pair of hardware components. With concurrent communication, data transmission between supported controllers and I/O modules can be redundant at the logical and physical levels. For details about concurrent communication operation, see the ControlLogix EtherNet/IP Network Devices User Manual, publication 1756-UM004.
Concurrent communication can be used with the following I/O:
- FLEXHA 5000™I/O modules
- FLEX 5000®safety I/O modules
You must use any of the following communication modules to establish concurrent communication with
FLEXHA 5000™
I/O modules and FLEX 5000®
safety I/O modules:- 1756-EN4TR
- 1756-EN4TRK
- 1756-EN4TRXT
System Requirements
The following tables provide the supported firmware revisions for concurrent communication system components.
1756-EN4TR, 1756-EN4TRK, 1756-EN4TRXT Modules | FLEX 5000® EtherNet/IP™ Adapters | FLEXHA 5000™ I/O Modules |
|---|---|---|
7.001 or later | 3.011 or later | 3.011 or later |
1756-EN4TR, 1756-EN4TRK, 1756-EN4TRXT Modules | FLEX 5000® EtherNet/IP™ Adapters | FLEX 5000® I/O Modules |
|---|---|---|
7.001 or later | 6.011 or later | All revisions |
Configuration Requirements
To configure 1756-EN4TR, 1756-EN4TRK, or 1756-EN4TRXT modules for concurrent communication, apply the following settings:
- In the device definition and on the physical modules, set the communication modules to use different IP addresses.
- In the device definition, set the Concurrent Communication setting to Yes.
Concurrent Communication Setting
When you apply the preceding settings, the following occurs automatically:
- IP address swapping is disabled.
- The connection type is set to unicast.
- The I/O modules automatically connect to the communication module with concurrent communication. No additional configuration is required.
- Class 1 connections to I/O modules that do not support concurrent communication require an additional communication adapter that is not configured for concurrent communication. Class 3 connections are supported, however.
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