7/30/2014 10:27 AM | |
Posts: 1058 Rating: (93) |
Hello Mishal, there are many differences in detail, but main thing is thatthe FM355 comes with 4 built in controller channels and you can assign inputs and outputs to these control channels. So the whole controlling is done by the FM355. If you use standard I/O, you would have to implement the control algorithm in your PLC software, by using SFB41/FB41 or others. I this case your PLC will have the workload of controlling, whereas with FM355 the controllin would be done by the card. This might also be a safety issue, as it would work, even when your PLC is down. For more detailled information read: SIMATIC S7-300 FM 355 closed-loop control module FM 355 C Getting Started regards |
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