steverino pussycat (Customer) asked a question.
BX-08TA is it possible one channel is bad?
Per the print, I double and triple checked my wiring:
and to start off I only had neon lighting connected for a shake down cruise:
I'm accustomed to the neon lights being dim due to leakage current, but Y10, (third channel) leaks but does not go live. I tried the 120V solenoid in the back as well, no current flows when showing on my laptop Y10 is on, the LED is on, all the other channels work as expected.
It is possible that the output is bad. The BX-08TR is better suited to this application, and you won't get leakage current through your lights.
It's worth noting that the solenoid can create coil backlash, or back EMF, when power is removed from the coil. This can exceed 50-80 volts, damaging card outputs. The addition of a 22051 surge protector across the coil will keep this from creating issues in the long-term on relay outputs.
I put an RC network across all relay and solenoid valve coils, or a backwards facing diode on DC applications to cope with field collapse.
Oh, and apologies for leaving this out . . . The neon lights were only for "live" testing the application. I had a box I made with incadescent bulbs to indicate outputs and switches to simulate inputs and by golly (fixed) if I know where I put it. :-)
For our outputs, we like using the Zip Link modules. Perhaps you already looked into these. You will need to design a larger enclosure though. The Zip Link relay module simply plugs into the PLC output module, keeps your 120VAC circuits from your PLC DC, separates your field circuits from your PLC circuits, has replaceable relays, has higher current ratings, and some relay modules have built-in circuit protection. (the plug-in relays are cheaper than the PLC module) However we prefer the DINnector terminal block supplemental circuit protectors for the output circuits rather than the module fuses. The DINnectors allow for easy disconnecting/connecting of the output circuits and you do not need to keep fuses on hand, Also look at the Zip Link transorb module, which might be easier than designing and connecting the RC circuits. Also keep in mind the PLC needs space on all side for cooling air flow.