11/13/2012 1:41 PM | |
Joined: 9/27/2006 Last visit: 9/24/2024 Posts: 12282 Rating: (2685)
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Hello MarisKu; What you are showing is the encoding mechnaism that protects front connectors in a S7-300 IO module.When you first installl a front connector in, say, an AI module, the stubs in the front of the module engage in a coded fashion. See the attachment, from the following manual: SIMATIC S7-300 CPU 31xC and CPU 31x: Installation When you remove the front connector from the module(for rewiring, or tests) the stubs are attached to the front connector, with a code that is unique to the type of module it came from. When you reinstall the front connector, you can only do so on the type of module it came from. You cannot install a front connector from a DO module in a AI module, therefore protecting the module from errors in wiring. Hope this helps, Daniel Chartier |
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