531X152IOCAKG1 GE Controller Process Interface Board
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Product Specification
Product Details 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
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