PLC 5 via MV171-MCM to Fuji PXR4 temp controller
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joereini
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Monday 13 December 2004 4:48:46 pm |
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PLC 5 via MV171-MCM to Fuji PXR4 temp controller
We're reading via MODBUS from the Fuji PXR4 controllers, but have not been able to write setpoint values to the PXR4s. Any ideas?
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Thursday 20 January 2005 11:02:24 am |
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RE:PLC 5 via MV171-MCM to Fuji PXR4 temp controller
Some devices/controllers have internal configurations that must be used to enable writing to them. Even if you can already read values from them, they might require a different configuration setting or jumper in the controller to allow them to be written to. Also, make sure you are writing to the correct addresses and are not trying to write multiple registers to non-contiguous ranges. You can also configure the MVI71-MCM to report errors from your commands. If you examine these error codes, it may help you diagnose your problem. And, you can use the built-in Data Analyzer to look at your Modbus commands going out to the controller and see what response, if any, the controller returns. This will also give you additional insight that may lead you to a solution. If you are still having trouble, you can send your ladder logic code to ProSoft Tech Support for analysis, to be sure you don't have any logic or configuration errors; or call them at 661-716-5100 for additional help via telephone.
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