raveon Posted March 27, 2012 Report Posted March 27, 2012 (edited) I have a FX-1N that appears to working normally. After 3 processor changes and the Matsushita GT-11 has be repalced with new as well, still no go. The error is displayed in the GT-11 as ERFF. All cables have been replaced. ERFF fault says its a PLC issue. We are stuck - all 3 shifts. We need help. Thanks Edited March 27, 2012 by raveon Quote
kaare_t Posted March 27, 2012 Report Posted March 27, 2012 If you connect the computer directly to the PLC and use debug, what error code(s) can you read out? Does this occur if you disconnect the OP and reset the PLC? Quote
raveon Posted March 27, 2012 Author Report Posted March 27, 2012 The only error we get is at step 2065. Invalid operation error. We are dividing one D register by another D whose value is 0. It makes no difference if the OP is hooked up or not Quote
kaare_t Posted March 27, 2012 Report Posted March 27, 2012 You are getting error because of the DIV by 0. Check if the value is > 0 before doing dividing. Quote
Crossbow Posted March 27, 2012 Report Posted March 27, 2012 You should always code a compare in front of a divide to ensure the divisor is not zero. Common sense code elimintates a lot of PLC errors. Quote
Sergei Troizky Posted April 4, 2012 Report Posted April 4, 2012 (edited) The ERFF (no communication) error on GT11 display has nothing with the PLC program execution*. The display should communicate even with stopped PLC. Verify the display communication settings to match the ones of the PLC. Verify the communication cable. If all these is OK, the PLC port is out of order (if this is the integrated mini-din port). One of our customers had exactly this recently. *If the display is connected to an optional RS232 communication board port, the latter may become inaccessible for PC or HMI when subject to RS instruction execution. Which port is the display connected to? Edited April 4, 2012 by Sergei Troizky Quote
raveon Posted May 11, 2012 Author Report Posted May 11, 2012 Sergey Thank-you very much. The first display was fried. The second display got fried because of a loose wire on a reset PB. It had absolutely nothing to do with the PLC. The GT11 didn't like having voltage spikes I guess. The loose wire was in a remote spot and was not visible. no excuses though. We all made it harder than it had to be. thanks everyone Quote
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