GE PACSystems RX7i, User Manual

Page: 123 / 276

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