PLC programming

[Guest Daniel Gunn]

I am a distributor for a not off the shelf pregrammed PLC. I have acustomer that owns one. The way it is programmed we cannot control 2 solenoids at once. I have spoke with the tech dept and they tell me that they would have to rewrite the software for my particular operation. If I pursue this without there assistance will I be able do this without requiring some sort off passcode to break into the programming. Is it possible to render the chip unuseable. Am I biting off more than I can chew since I have no expierience in programming. I have until spring to do this so I would like the expierience. Any thoughts would be very helpful.

[BobB 58]

First off, how about joining the community? Which PLC? Which programming software? If the PLC program is password protected, you are probably in trouble. Some Omron PLC's have a lockout feature if too many attempts are made at defeating a password. The PLC is then useless. Some do not.

[Guest Guest_meterman]

Hi I have joined Thank You, Yuo can see my username obviously, thought I had before. Anyway the PLC is cooperatively built by A PD meter Manufacturer, Licquid Controls. is that any help?

[Guest Phil]

In simplicity, there is an answer withoutcahnging code, sinply add a rela that will enable the two solenoids at once by the energized out put of the plc. Tip it is not good practice to energize solenoids directly from a plc since it damages the output. Even if the out of the plc is rated for 10 amps. Good luck Sincerely Phil pcampling@direcway.com

[Guest Guest_meterman]

Thank you for your comments. Phil we already tried the relay trick, we have 2 pumps to start and stop at different times along with the solenoids. I am not the eltrician for this operation so I cannot tell you how the sync. was done. Dan

[BobB 58]

I gather from your reply that it is a proprietary PLC and not an Omron PLC. If this is the case then I would suggest you are almost certainly locked in to the manufacturer.

[meterman 0]

I believe you are right. Due to the fact that it is NIST traceable and weightrs and measures approved I can't use off the shelf (Omron,GE etc.) for this app. Thanks for the responses. This is a great sight!