531X152IOCAKG1 GE Controller Process Interface Board

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The timer shown in Figure 4.7 is reset on the first scan. On the second scan, it

starts timing. After 5seconds, it energizes a bit called“COMINIT”, which is used

to trigger the COM_REQ. It also energizes a bit called“RTMINIT”. On the next scan,

“COMINIT”is turned off, and the RTMINIT bit causes the timer to be disabled indefinitely.

Temporary (%T) data types are used for these two bits, so that their state is not

retained through a reset.After the COM_REQ has been executed, it writes status

data to the status register specified in theCOM_REQ data block. This register is

monitored by the ladder logic to determine the successful (or unsuccesful) result

of the COM_REQ. It is good practice to clear the status register just prior to execution
of the COM_REQ, ensuring the validity of future data.

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