1. 10 Dolog

10 Dolog

I am not familiar with the software or the specific card you are using, so I don't know the actual commands. When using the original 984LL software some Modicon analog cards needed to be configured before you could read them. This usually consisted of writing values into specific 4x registers to tell the card what type of analog signal was going to be seen on each channel as well as what channels will be active (this only had to be done once at each power up).

Then each time you want to read a value you write a value to a different register to tell the card what channels (up to two at a time) to scan and which 3x register to put the each value into. This allows you to read some inputs at different rates then other inputs. In effect, you need to create your own input multiplexer. There might be some more information (Modicon has lots of examples for 984LL commands) on your specific card.

The software used is in AKF language and the program is Dolog B. I have at this moment a AEG A500 PLC, programmed with a DOS computer and having trouble loading the software after a power failure; The supply unit of the PLC was malfunctioning and a have succesfully repaired this. However, getting the software in the RAM of this old PLC is very difficult. I have problems with the memory allocation and i will try on monday to clear this out for my costumer. I have a German copy of the description of this PLC 'A500 Vademecum', complete with the AKF instruction set and the hardware configuration. I wish you good luck and if needed I can give you a copy of the Vademecum. You have clicked on the '?'

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