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LemmyRose

Discrete Input Module Issue on DL06 PLC

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Hi,

I have a DL06 PLC with two discrete input modules (D0-16ND3); I have two issues.

1. One module only returns appears to signal on the first 4 inputs (X100,X101,X102,X103); whereas the other one reads all 16. I switched card-slot positions and the same card hard the same issue. Is this likely a faulty module?

2. My odd X's are paired. When I turn on X201, X205 is also on (and vice versa). Same occurs for the following pairs: X203/X207, X211/X215, X213/X217. Occurs on both cards. I did not put an application on the PLC. It may be wiring issue.

Any advice on what the issue might be or how to troubleshoot it? Thanks!

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Posted (edited)

When you swapped the modules did you swap the wiring block? If not then it is most likely the module. If you did then inspect your wiring, especially the commons. It sounds like commons - signals swapped.

Edited by b_carlton

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Sounds like a dropped common.

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