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| 11/28/2007 11:20 PM | |
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Posts: 5 Rating:
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Hi, I had questions regarding wiring this the SM 331 AI 8 x 16 bit module (6ES7331-7NF-0AB0). For wiring the current inputs, does it matter where the input goes? I am using the Top Connect TPA modules to interface to it. I want to use channels 4 and 5 as current input, and 6 and 7 for voltage inputs. The voltage inputs are working fine, however I keep reading 8000 (underflow) for my current inputs. So for channel 4, I have jumpered B to B, and C to C on the 2 TPA terminal blocks and I connect the 4-20 source to B and return to C. Using a multimeter, I read 4mA. But the PLC reads 8000. I connected the inputs what would be pins 32 and 33 of the module, instead of 12 and 13. Does this matter? I know in the manual it shows the current going into the left side, but since they are jumpered anyways, I didn't think it would be an issue. Does the ribbon cable orientation different for the bottom 4 channels than the top 4? The voltage inputs, which existed before I worked on this, have ribbon cables that are not oriented like in the manual. The marker on the ribbon cable is on the triangle side of the 16pin connector on one end, but flipped over so it doesn't line up with the triangle on the other cnd. However this input is detected properly by the PLC. Thanks for any input |
| 12/2/2007 8:24 PM | |
Joined: 1/7/2006 Last visit: 3/9/2025 Posts: 2705 Rating:
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Hi, Please look for the handbook of the MTA modules... instead of the TPA modules of Top Connect. Marshalled Termination Assemblies ET 200M Remote I/O Modules If you already have the TPA modules, then please look in the handbook S7-400Hof the H-System in chapter F Connection examples for redundant I/Os. |
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I hope that the answer will help, if you have still questions, don't hesitate to ask me. |
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| 12/12/2007 9:23 AM | |
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Posts: 3 Rating:
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Supposing you are talking about the 6ES7331 7NF00-0AB0. Left side has several 250 Ohm resistance. They are there to use it with the current sensors. When the current goes from pin 2 to pin 3 (for example), a voltage is generated between this pins due to the 250 Ohms. If you calculate, 4 mA generate a 1V voltage, and 20 mA generate a 5V voltage. This voltage has to be wired to the 22 and 23 pins (in this case) where the op-amps of the right side can translate the voltage given depending of the configuration given in the HW-Config. Please note that I'm always refering to the pins of the module I hope this has been helpful for you You can find more information of the analog input modules in the following address. https://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&lang=es&siteid=csius&aktprim=0&extranet=standard&viewreg=WW&objid=10805159&treeLang=es Best regards |
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