N
Hello, I've encountered something funny with a siemens S5 135u cpu928a plc. I have an output at the end of a rung that will not activate when the logic in front of it is true(there is only one contact in front). I've seen this happen when the o/p is used multiple times causing erratic behavior but I've checked the o/p and its only used once in the program. I'm using fas trak software to monitor the program and cannot figure out what is happening. Any ideas? Regards Joe n