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Maholobob

eaton elc and hmi problems

4 posts in this topic

ELC PV28NNDR with ELC COEMNETM and HMI06CE panel I've got the rs 232 cable hooked up to the network card but the HMI shows com error 3 can't read...can't write. When I plug the 232 into the PLC I lose my power light but the other cards still show a power light. Need help getting these two to talk. No program in the plc and only a tester in the hmi, can't get the plc to talk to my computer either....

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I don't know this PLC, but I dabbled with RS232 comms some 20 years ago. Is it a sealed cable that has been bought, or a home made cable? Losing the power light would make me think of an earth fault, so could plugging it in be shorting anything? If the cable is a home made one, I would take the covers off of the end, check the wiring and quality of soldering. You only need 3 wires for the RS232 comms, but they usually use a few status bits, so may require a few pins linked out at one end or the other. There are examples of this on the net. Good luck

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I had similar issues in the past and it was because the DC was grounded on the + side. Since the PLC is floating, it was not affected but the HMI is referenced on the _ side and when they were plugged in together it would take out the PLC and any of the analog cards as well.

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