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Using RSLogix5, A PLC-5/40E was programmed. There are 2 1771-A3B I/O chassis. Second chassis has ASB adapter, 5 IBDs and 4 OW16 modules. The 1st chassis has PLC, 1785-DMC1A, 1771-MCM, 2 IFEs, 2 OFEs, 1 IBD and 2 OWs modules. Both chassis use P4 power supply modules and the I/O modules are in the above said order in chasis.
Once in a while, I find that the bottom 8 inputs (out of 16) of any one IBD module are frozen in the PLC Input Data table. The changes in field signals are reflected by the IBD module LEDs properly (on/off) but the corresponding Data Table in the PLC Input file do not change. In such a situation, I have to recycle the chassis power to make everything work properly.
This happens very randomly - on different IBDs modules and may be once in 2 to 3 months!
Can someone throw some light on this problem?
Once in a while, I find that the bottom 8 inputs (out of 16) of any one IBD module are frozen in the PLC Input Data table. The changes in field signals are reflected by the IBD module LEDs properly (on/off) but the corresponding Data Table in the PLC Input file do not change. In such a situation, I have to recycle the chassis power to make everything work properly.
This happens very randomly - on different IBDs modules and may be once in 2 to 3 months!
Can someone throw some light on this problem?