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Alex Krashevsky

CQM1H CPU-61 and Barcode

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23.07.03 Hi, Mr. Jay! Hi, Friends! In the project Printing Press have Plc CQM1H CPU-61, Which connect via RS 232C with Barcode and Barcode pass information to CPU-61.Controller must execution mathematical campers and quickly to give outputs. Communications between Plc and Barcode is Okay, but CQM1H CPU-61 sometimes miss outputs and every time give outputs with delay in difference intervals of time. In the process, outputs mast be is stability, because process pass quickly (Here is conveyer) And transistor outputs CPU-61 must to start Pushers, which finds on the some distance from Barcode and CQM1H CPU-61. Every Pusher is standing alone Plc CQM1H CPU-51. The CQM1H CPU-61 with Barcode is main Plc in the process, which outputs must to starts inputs for Plc’s CQM1H CPU-51 (Pushers). My generally problem: *** Miss outputs from CPU-61 *** Delay time outputs and difference intervals of outputs time in CPU-61, Although Barcode read information correctly. With best regards Alex.

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How are you communicating from the 61H to the other PLCs? Network or relays. The variation in outputs could be due to a variation in scan time. Is the scan time fairly constant? Have you tried interrupt programming? More information required.

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