PLC Programming

roxtech · Feb 28, 2011

Hi Dears,
It is possible to define any counter in PLC for detecting, how much uploaded program from PLC? If it is possible then HOW?

Regards,

uptown47 · Feb 28, 2011

As far as I'm aware, this isn't possible unless you implemented a switch that people could push everytime they've done an upload? I don't think there's an automated way of doing this...?

Unless uploading would adversely affect the scan time and there was some way of monitoring fluctuations in scan time perhaps??

daba · Feb 28, 2011

Do you mean "Downloading" - As in transferring a new program to the PLC ?

If this is Logix5000 (1756 ControlLogix/GuardLogix, 1768 CompactLogix/CompactGuardLogix, 1769 Compactlogix, 1789 SoftLogix, or DriveLogix) you are talking about, then yes, there is a way, using "Controller Logging" to CompactFlash memory card.

Get hold of Publication 1756-PM015C-EN-P and look at chapter 3.

If it is anything other than those above, I'm afraid I don't know.

Barry Kirk · Feb 28, 2011

Again, not sure about uploading, but for downloading. For many PLCs, when you download a PLC program, the PLC leaves run mode during the download. Most PLCs have a "first scan" program or bit that executes or is set on the first scan of a program after leaving stop mode.

You could hook a counter up to the first scan program or bit.

daba · Feb 28, 2011

Barry Kirk said:
Again, not sure about uploading, but for downloading. For many PLCs, when you download a PLC program, the PLC leaves run mode during the download. Most PLCs have a "first scan" program or bit that executes or is set on the first scan of a program after leaving stop mode.

You could hook a counter up to the first scan program or bit.

Which of course will count every transition into run-mode, including any power outages, deliberate or not.

Barry Kirk · Feb 28, 2011

Correct... my bad for failing to mention that.

ScottTheEngineer · Feb 28, 2011

daba said:
Which of course will count every transition into run-mode, including any power outages, deliberate or not.

Barry Kirk said:
Correct... my bad for failing to mention that.

Wouldn't the counter data be overwritten on the download?

daba · Feb 28, 2011

ScottTheEngineer said:
Wouldn't the counter data be overwritten on the download?

I think he was thinking of pulsing an external counter....

PLC Programming

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