531X152IOCAKG1 GE Controller Process Interface Board

Product Specification

Product Details
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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