adccommunitymod (AutomationDirect) asked a question.
Do More Mystery
Created Date: March 03,2016
Created By: winterrossi
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I was called in to work early this morning because our dust collection system wouldn't start. It was stuck in the middle of the shutdown sequence, but everything was off. It's running on an H2-DM1E. I came in and found that the PLC was in program mode. I changed it to run and everything is fine. Anybody got any idea how it could have gotten into program mode?:confused:
Created Date: March 03,2016
Created by: kewakl
Any entries in the event log or system status?
Was the Mode Switch in Run/Term/Stop position? Maybe someone 'helped ' you by sliding to STOP then back to TERM. (this should be logged in the event log)
Created Date: March 03,2016
Created by: winterrossi
It just shows a bunch of "system turned on " and "system turned off " messages.
Created Date: March 03,2016
Created by: kewakl
That is some Turning OFF and then Back ON.
Is this a power cycle?
S169, Thu Mar 03 02:23:41 2016, System was turned off
S170, Thu Mar 03 02:23:52 2016, System was turned on
S171, Thu Mar 03 04:52:22 2016, System was turned off
S172, Thu Mar 03 04:52:42 2016, System was turned on
S173, Thu Mar 03 04:55:27 2016, System was turned off
S174, Thu Mar 03 04:55:43 2016, System was turned on
S175, Thu Mar 03 05:01:14 2016, System was turned off
S176, Thu Mar 03 05:03:35 2016, System was turned on
S177, Thu Mar 03 05:11:18 2016, System was turned off
S178, Thu Mar 03 05:13:58 2016, System was turned on
S179, Thu Mar 03 05:14:58 2016, System was turned off
S180, Thu Mar 03 05:38:14 2016, System was turned on
Do you have any entries in the System Status - LAST ERROR0 - LAST ERROR7
Created Date: March 03,2016
Created by: winterrossi
System Status has no errors showing. The last 5 are where the startup guy was cycling power to the cabinet. The first one I'm not sure about. I'll have to ask the night shift maint guy if something happened when he shut it down last night. Even if power did cycle, I can't understand why it went into program mode
Created Date: March 03,2016
Created by: kewakl
Even if power did cycle, I can't understand why it went into program mode
True, especially without a fault entry.
Created Date: March 03,2016
Created by: BobO
After it reboots 10 times due to a hardware watchdog, it drops into program mode. The watchdogs will show up as power cycles. Look at the contents of $WatchdogReboots and $WatchdogReboot. The first counts the total number, the second is a flag to tell if the most recent reboot is due to a watchdog.
Created Date: March 03,2016
Created by: winterrossi
After it reboots 10 times due to a hardware watchdog, it drops into program mode. The watchdogs will show up as power cycles. Look at the contents of $WatchdogReboots and $WatchdogReboot. The first counts the total number, the second is a flag to tell if the most recent reboot is due to a watchdog.
0 and OFF. What resets those?
Created Date: March 03,2016
Created by: BobO
0 and OFF. What resets those?
Clearing the PLC or manually clearing those locations. Doesn't sound like a watchdog. Good.
The other possibility is the base being unstable or a module improperly seated, resulting in an apparent I/O change. Any kind of base configuration change will drop to program.
...and also Ethernet I/O failing.
Created Date: March 03,2016
Created by: winterrossi
Hmm. Ethernet I/O failure could be the issue, but I don't see any evidence of that. It doesn't show any dropped packets or faults on the I/O monitor screen
Created Date: March 03,2016
Created by: BobO
Hmm. Ethernet I/O failure could be the issue, but I don't see any evidence of that. It doesn't show any dropped packets or faults on the I/O monitor screen
Probably the only artifact of a failure after it has cleared is the Last Error Code field for the failed slave. You can view that from the Ethernet I/O Monitor dialog.