Dec 8, 2013
Ground faults for AS-Interface must be avoided. No news here. In this case we were confronted with an AS-Interface system composed of three networks and suddenly all three networks reported a ground fault. How is that possible? Systematic troubleshooting makes it easy and fast to figure out what is going on.
The second topic today deals with connecting two e-stops in series to a single safe input module. Everything worked until the installers tested an e-stop. Now they were not able to restart. Strange? Fortunately, there are LEDs on the safety modules to troubleshoot these kinds of situations.