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GFK-1541B Chapter 4 Programming Modbus/TCP Channel Commands 4-31
4
Commreq. CLOSE_REQ is a one-shot (Positive Transition) coil, activating once when
READ_SUCCESS transitions from OFF to ON.
Rung # 13
: The MOVE WORD function moves a zero to the CRS word referenced in the
Command Block (see rung #9). This clears the CRS word. This rung also resets the
CLOSE_FLT output coil of the COMMREQ Function Block in rung #15.
14
15
16
Rung # 14
: The BLKMV INT functions set up the COMMREQ Command Block contents.
When this rung is activated, the constant operands are moved into the memory beginning at the
address indicated in the instruction. The constant operands in this example are defined in the
Close Modbus/TCP Connection Example in this chapter.
Rung # 15
: The COMMREQ Function Block has three input parameters and one output
parameter.