2/14/2023 2:11 PM | |
Joined: 9/27/2006 Last visit: 10/17/2024 Posts: 12289 Rating: (2687)
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Helllo Devandra_Thakur; Have yu followed te wiring recommendations for the SM 335, specified in Ch 2 of the manual for the module? https://support.industry.siemens.com/cs/ca/en/view/1398483 First, to prevent interference coupling between AI channels, the manual describes a specific way to connect them to the input signals and the main grounding point, with shielded twisted-pair cables., See the sceenshot below. Next, the manual provides hints on hw to handle analog input channels that are unused, therefore are susceptible to cross-talk: "Analog inputs which are not wired Short the analog inputs of SM 335 which are not wired and connect them to MANA. Disable all analog inputs which are not wired in HW Config in order to optimize interference resistance at the SM 335 and reduce the cycle time in "free cycle" mode. You can also use analog inputs which are not wired to monitor the encoder supply or analog outputs. This also increases interference resistance". Check your present wiring scheme and apply these recommendations, this should help eliminate the interference readings you are getting. Hope this helps, Daniel Chartier |
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