5000 Fault

I just took a QUICK look at the "power up" handler you posted ...

first thoughts: I doubt that the "unconditional" ONS rung will work the way you have it ...

secret handshake: with a ControlLogix (and incidentally with a PLC-5)
each time the processor goes into the Run mode, a PRESCAN operation takes place ... during the prescan, all ONS instructions have their "status bits" set to a ONE condition ... this is done (for better or for worse) to prevent "false triggering" when the system first starts up ... (note that this rule is slightly different for MicroLogix and SLC systems) ...

so ...

regardless of whether the "fault handler" itself ever gets executed or not, I don't think you're going to get the desired operation out of that ONS rung ...

hint: you should be able to use the "scan counter" idea I posted earlier to check out the operation of an "unconditional" ONS rung at start up ... specifically, put that rung in a "standard" (executed) routine file and switch the processor from Program mode to Run mode a couple of times ... you won't need a battery for that test ... (this will trigger a PRESCAN operation) ... notice that the unconditional ONS will NOT fire the way you might expect it to when the processor first goes into the Run mode ...

I'll try to take a closer look at your posted programs later today (or tonight) if I get some free time ...
 

Similar Topics

Does anyone know the bits to examine for processor fault status? For a simple processor status indicator. Currently I'm using from GSV...
Replies
9
Views
1,115
​Hello everyone, I triyng to link a Power Module eMB-60R from Robot Adept Viper s650 to CompactLogix, version 19.11 I followed exactly the...
Replies
9
Views
2,549
I've made a fault routine to notify operators when an IO module causes a major fault, and provided a button to manually reset the fault, but I'd...
Replies
8
Views
2,389
Hi, I have 2 safety devices (Banner EZ LS light curtains and a Keyence GS-71 Interlock) that are giving me some difficulties. The plc is a Compact...
Replies
6
Views
1,929
does anyone know how or If you can Change the default sheet size to A3 for New FBD's so that when you create a new FBD during online editing it...
Replies
0
Views
754
Back
Top Bottom