GE PACSystems RXi User Manual
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Chapter 8. Gigabit Ethernet (GbE) Interface Overview and OperationGFK-2816F August 2015 185Rung #11: When ETH_READY is set the CRS word for the Modbus TCP Read COMMREQis monitored for a status of 1, indicating that the Read COMMREQ completed successfully.The CRS word change to 1 sets coil READ_SUCCESS.Rung #12: When READ_SUCCESS is set it triggers CLOSE_REQ, which enables executionof the BLKMOV, MOVE and COMMREQ functions for the Close Modbus TCP ConnectionCOMMREQ. CLOSE_REQ is a one-shot (Positive Transition) coil, activating once whenREAD_SUCCESS transitions from OFF to ON.Rung #13: The MOVE WORD function moves a zero to the CRS word referenced in theCommand Block. This rung also resets the CLOSE_FLT output coil of the COMMREQfunction block in rung #15.Rung #14: The DATA_INIT_COMM function sets up the COMMREQ Command Blockcontents. When this rung is activated, the constant operands are moved into the memorybeginning at the address indicated in the instruction. The constant operands in this exampleare defined in the Close Modbus TCP Connection example on page 168. |
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