GE PACSystems RX7i, User Manual

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Chapter 7. Programming SRTP Channel Commands
GFK-2224Q January 2017 113
7.2 COMMREQ Format for Programming Channel Commands
The Channel commands described in this chapter are sent using the Communications Request (COMMREQ)
function.
The Communications Request is triggered when the logic program passes power to the COMMREQ Function
Block.
(Enable )
-------------
(Command Block address)
(Rack/Slot Location of
the Ethernet Interface)
(Task value)
-
-
-
-
Function Faulted (logic)
COMM
REQ
IN FT
SYSID
TASK
-
CommReq Delivered
Figure 49: COMMREQ for Programming Channel Commands
For the Channel Commands, the parameters of the COMMREQ are:
Enable: Control logic for activating the COMMREQ Function Block.
IN: The location of the Command Block. It can be any valid address within a word-oriented area of (%R, %AI,
%AQ, %P, %L, or %W).
SYSID: A hexadecimal word value that gives the rack (high byte) and slot (low byte) location of the Ethernet
Interface. For the PACSystems CPU embedded Ethernet interface, enter the rack/slot location of the CPU
module.
Rack Slot Hex Word Value
0 0 0000H (RXi and CPE400)
0 4 0004H
3 4 0304H
2 9 0209H
4 2 0402H
TASK: For the PACSystems Ethernet module, Task must be set to zero.
For the PACSystems CPU embedded Ethernet interface, Task must be set to the value 65536 (10000H) to
address the CPU’s Ethernet daughterboard.
Caution
Entering an incorrect TASK value may cause the Ethernet Interface to fail.
FT Output: The FT output is set if the PLC CPU (rather than the Ethernet Interface) detects that the COMMREQ
fails. In this case, the other status indicators are not updated for this COMMREQ.