GFK-2224Q January 2017 110
Chapter 7 Programming SRTP Channel Commands
This chapter describes how to implement PLC to PLC communications over the Ethernet network using SRTP
Channel commands:
▪ SRTP Channel Commands
- Channel Operations
- Aborting and Re-tasking a Channel
- SRTP Channel Commands in a Redundant System
- Executing a Channel Command
▪ COMMREQ Format for Programming Channel Commands
- Establish Read Channel
- Establish Write Channel
- Send Information Report
- Abort Channel
- Retrieve Detailed Channel Status
▪ Programming for Channel Commands
- COMMREQ Example
- Sequencing Communications Requests
- Managing Channels and TCP Connections
- Use Channel Re-Tasking to Avoid using up TCP Connections
- Client Channels TCP Resource Management
- SRTP Application Timeouts
▪ Monitoring Channel Status
▪ Differences between Series 90 and PACSystems SRTP Channels
7.1 SRTP Channel Commands
The SRTP Channel commands are a set of client PLC commands that can be used to communicate with a
server PLC.
A Channel command can establish a channel to execute multiple periodic reads or writes with a single initiation
of a COMMREQ function. A Channel command can also be used to execute a single read or write.
There are five Channel commands:
▪ Establish Read Channel
▪ Establish Write Channel
▪ Send Information Report
▪ Abort Channel
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