vasovas Posted August 10, 2020 Report Share Posted August 10, 2020 Hello, I have an issue reading the values of HSC by Ignition SCADA. PLC type: SM35-J-R20. Shortly, there is a simple logic calculating the total output from the machine, PNP proximity sensor is used to measure the number of the passing products, and it is connected to HSC input of the PLC. SCADA monitors the current and the previous value of the counter, and in case the counter has been reset when the batch is being changed (the previous value is bigger than the current value), the previous value is memorized and it is added to the current counter value, at the same time a tag value is incremented by 1 (this tag is like a flag, a proof that the counter has been reset) . Now, the problem: without reset of the counter, the flag shows increments, and the output is not calculated properly. The most important: 50% of the machines are equipped with SM35-J-R20, and the rest - with Omron CJ1M; the problem never has been faced on Omron machines. The communication protocol used for both type PLC is Modbus TCP. Any ideas what might be the root cause? Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.