adccommunitymod (AutomationDirect) asked a question.
DL06 power-on bit?
Created Date: November 17,2003
Created By: Arrington
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Good afternoon, all. I'm writing today to ask if anyone's got experience with respect to a DL06 PLC and a power-on bit. Does the 06 offer me a power-on bit? Thank you very much! -Dan
Created Date: November 17,2003
Created by: Arrington
Good afternoon, all. I'm writing today to ask if anyone's got experience with respect to a DL06 PLC and a power-on bit. Does the 06 offer me a power-on bit?
Thank you very much!
-Dan
Created Date: November 17,2003
Created by: Arrington
A-ha! Found it... it's SP0 in DirectSoft.
Have a great day.
Created Date: November 20,2003
Created by: JimHoward
Dan,
Be certain that SP0 is what you want for your application. SP0 is energized during the first scan of the PLC, and then it is de-energized "forever ".
If you want a simple way to monitor, "Is the PLC powered-up and in run mode? " write the ladder logic...
Always On
SP1
--] [--------------------( C0 )
and then monitor C0. If the PLC is not running, C0 will de-energized (provided C0 is non-retentive, which is the default setting for the DL06).
Created Date: November 20,2003
Created by: Arrington
Thanks, Jim. I appreciate the help.
Now I'm wondering if I can use SP0 with another contact (say, X1 or even C1) as permissives for SETting another bit for use later.
Example:
SP1 X1 SET
-| |---| |---------( C1 )
I 've tried it without success, but then again I may have been doing something wrong....
-Dan
Created Date: November 20,2003
Created by: Rday
I just tried what I think your wanting and it seems to work. Since SP0 is only on for 1 scan your X1 would have to be on at start up and you would have to make the rung latch.
SP0 X1 C1
|---| |---| |----( )---|
| C1 | |
|----| |------| |
Created Date: November 20,2003
Created by: franji1
I do not understand the question. If you truly want to monitor if the PLC is RUNNING - you MUST check the RUN SPs:
If ANY of the following are ON: SP11, SP12, SP13, then the PLC is running (that means POWER ON AND in Run mode). To think "negatively ", if ALL of them are OFF (or if you could not read them because the PLC had no power), then the machine is OFF (otherwise, it's on).
Do you consider your machine "running " if the PLC is ON but is in PROGRAM mode? I would think not. Your PLC CAN be in PROGRAM mode even if the switch is in the RUN position! How? Fatal error!
Just monitor SP11, SP12, and SP13. Do NOT write any ladder logic - that won't help.
It would help if you can define SPECIFICALLY what you mean by "power on ". I would think you mean on AND in Run mode.
Created Date: November 21,2003
Created by: marksji
I certianly hope you 're trying to poll the PLC with some other device, afterall if the PLC is not running neither is your ladder logic. Just look to see if any of the following are on:
SP11, SP12, SP13
Note that you only need ONE of them to be on, not all three.