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The Communications Request function block has four inputs and two outputs. The first input is an enable input. Generally a one-shot coil is used to enable the COMMREQ function. This prevents multiple messages from being sent. 

The second input (IN) is the starting location of the COMMREQ command block. The SYSID input is used to indicate which rack and slot to send the message to (physical location of Analog module). The last input (TASK) is set to the channel number to be configured. In the above example, channel 1 of rack 1, slot 7 will be configured and the COMMREQ command block starts at Register 0001.

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The Communications Request (COMMREQ) function is a conditionally executed function that communicates a particular request, through the ladder logic program, to the Analog module.

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