Eric @ SM Posted November 18, 2015 Report Share Posted November 18, 2015 It's been a while since I've had to deal with this, as I've changed companies over a year ago, but one of my old customers contacted me and is having an issue with a V570-57-T20B that is plugged into an EX-A2X adapter. The adapter has a DI16 and RO8 attached. He is getting a blinking COM light, and obviously because of that nothing is working. These components are all installed on a fuel tanker truck, and they control the fuel delivery systems, so obviously this is a bit of an issue. He's replaced the EX-A2X, same result. Could this be a cable problem, or a problem with the DI16 (it is first in line after the EX)? Installation is a good 1k miles away from me, so it's not like I can just go look at it... Quote Link to comment Share on other sites More sharing options...
cantcliff Posted November 19, 2015 Report Share Posted November 19, 2015 Could be a wiring issue. *edit* I would double check some of the 0v lines to make sure they are all on commons. I had issues with communications once that was caused by that. Quote Link to comment Share on other sites More sharing options...
Eric @ SM Posted November 23, 2015 Author Report Share Posted November 23, 2015 I can have him check the 0V side, but I doubt that to be the issue as everything has power and this is a straight 12VDC system ("L" model expansions). I'm beginning to suspect the expansion cable but again, since I can't just go look and check myself it's hard to make that determination. Anyone have the pin-outs on that cable? It is a custom made (~28ft long) cable. Quote Link to comment Share on other sites More sharing options...
cantcliff Posted November 23, 2015 Report Share Posted November 23, 2015 Even if everything has power, the EX-A2X *requires* that the communications module and the PLC are on the same power supply (Page 5 of the documentation for the adapter). I've experience this issue in my own box when first using on of these as I missed that portion of the documentation as well and used a secondary power supply to power the EX-A2X but was having comms issues like you're having. Both units must power up simultaneously as well. How long have they been running that cable? If they wired it as a standard RJ45 network cable it won't work. There is definitely something different about the EXL-CAB100 as even plugging it in backwards can cause communication issues (Personal experience for not reading labels). Quote Link to comment Share on other sites More sharing options...
Eric @ SM Posted December 3, 2015 Author Report Share Posted December 3, 2015 They do get powered by the same source, as I've experienced the timing issue before. The cable is one I made myself shortly after the EX-A2X was released to replace the EX-A1, so while I know it uses an RJ cable and ends, I know it only uses 6 wires of the 8 and that they are different end to end. I was going to have him make a new cable. I actually just realize a customer sent in an EX-A2X so I can get the pin assignments myself. Quote Link to comment Share on other sites More sharing options...
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