Output to PLC

[sal7 0]

Hi, What i am trying to achieve is to out to a plc so that a light comes. I am trying to achieive this via some MES/SCADA software, when i send a value through the software it should switch on the light. I am doing this through OPC server and a data logger. When i send the Value through it does go through the OPC server and i can see that value in the data logger i just dont know of any commands to use in Twidosoft to say when that value comes into a memoryword or memoryflag or an input or any other command in twido, the output should be to switch the light on. any help would be much appreciated Regards, Sal

[aggattapauer 2]

I suppose you are trying to write the value 1 in the PLC memory word 0 (modbus address 400001) and you want to light on the first output %Q0.0. In the software you may write (in editor list) the following lines: LD [ %MW0 = 1 ] ST %Q0.0 END Meanings: first line = load the memory word 0 and when it is equal to 1 second line = store the logic result (1 true, 0 false) to the output %Q0.0 third line = cycle finished so update the outputs If you want to write a bit rather than a word for instance %M0 you may write as follows: LD %M0 ST %Q0.0 END Load the bit 0 and store the value in the output Q0.0

[sal7 0]

Hi, I tried that, but it is not working, i can see the value hit the data logger and have checked the OFS client to see if that MW is good but still cannot get it to put a value in the PLC. Regards, Sal

[sal7 0]

i got it i was making a silly mistake, thanks for all your help. Regards, Sal

[aggattapauer 2]

hi, I'm happy for you. Can you post how you have solved the problem?

[sal7 0]

Yeash sure thing. The OFS server was in the wrong PLC mode. i have options of UNITY, PL7, CONCEPT, X-TEl, and ORPHEE. For this particular type i had to select in CONCEPT. So i could see everything hit the datalogger and the OFS data quality was good but was not getting through to the PLC. Regards, Sal