Hey, all. Quick electrical question: if I want to check the Safe Outputs on a SafeRDC, can I do it with a continuity tester, and if so, which X40 pin should I use as the "common"?
Background: A client has a working system that they recently had to replace the SafeRDC after the EEPROM memory stopped accepting writes. All settings appear to have been successfully written to the new SafeRDC card, and the Mastering Reference has been carried out. The robot is showing no errors, and the settings in Safety Config match what they were before, so there's no reason to suspect data corruption.
The problem is that right now the pendant Diagnostic screen shows the outputs for Monitoring Spaces 6&7, and the Monitoring Status, are closed (and the Space outputs change state if the robot is jogged past the boundaries). But the Safety PLC is not seeing those "relay contacts" close. The safety inputs to the robot all appear to be working correctly, so I don't think the X40 cable has been disconnected. The only signals "missing" are the robot outputs.
What I'd like to do is disconnect the X40 cable at the RDC box, and use a continuity tester directly on the pins. Looking at the SafeOperation manual, Monitoring Space 6 is OUT_A0_A and OUT_A0_B, on pins D1 and D2, respectively. So if I put one lead of my tester onto D1, where should the other lead go? I'm guessing B5 (+24V_AUSG_A). And for D2, B6 (the _B channel). But before I go risking a short and frying a brand-new RDC, I'd love to get a sanity check as to whether I'm right or not.