Eric @ SM Posted November 18, 2015 Report 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...
cantcliff Posted November 19, 2015 Report 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.
Eric @ SM Posted November 23, 2015 Author Report 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.
cantcliff Posted November 23, 2015 Report 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).
Eric @ SM Posted December 3, 2015 Author Report 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.
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