You must register for free to get a SSO login and password. The fact that Mark tested the cables he sent you on his Series 90 Micro, and those same cables don't work for you 100 percent of the time suggests to me that there may an incompatibility between the firmware on your PLC and the software version on your PC.įirmware Update for GE Fanuc Series 90 Micro via USB to RS422 Adapter (IC690USB901) utilizing Windows 7ĭownload Series 90 Micro firmware release 3.10 at GE Automation Support web site They just connect one side of each signal's pair to signal ground. The so-called "cheater" cables don't have the OpAmps. A RS232/RS485 converter runs each RS232 signal through an OpAmp which outputs a signal and its inverse to make up the RS485 pair. RS232 measures the voltage difference between a single wire and the wire labeled "Signal Ground". The biggest difference between the two is that RS485 uses a pair of wires for each signal and interprets a one or zero based on the voltage between the pair of wires. What I was referring to about the cables is that the 15-pin port on the Series 90 Micro is RS485 while the seriel port on your laptop is RS232. While access level 4 is the highest nominal level, the OEM password, if present is above level 4. For example, I once ran into a Series 90 Micro that would not communicate at all when I used an early revision level of my Horner RS232/RS485 converter, but worked fine with newer units that had a slightly lower current draw. You could also try contacting GE tech support at 800 433-2682 to see if they have anything to suggest.Īlso, what are you using for a cable? Does it include a RS232/RS485 converter or are you using a cable that that ties one side of the transmit and receive twisted pairs to ground? I seem to remember that the Series 90 Micro was more finicky than the 90-30 about how much deviation from the officially sanctioned cabling you could get away with.
Right under the yellow line near the top of the screen it will show the CPU model and the "Software revision". Go online with Logicmaster and navigate to the "Status" menu (F3). Perhaps your version of Logicmaster and VersaPro is too recent for the firmware version of the Micro. Maybe the Series 90 Micro drops communication when confronted with a password issue?Īnother possibility could be a firmware mismatch issue. When you try to upload a password protected program from the PLC to Logicmaster you get a message that says "Insufficient privilege for attempted operation".
In the 90-30 when the original programmer applied an OEM password, you can view the configuration but not the ladder logic. I'm more familiar with the way that works on a 90-30 than a Series 90 Micro. The behavior you're describing sounds a little like there might be an OEM password applied to the PLC.
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