FIFO instruction

[PLC4me 0]

I Looking for a FIFO instruction, I want to save the register value of DM100 every time it change so I can recall it later and see all instance it was change. What best instruction should I use and does anyone have a example this would be great. Thanks

[Nibroc 4]

Hi, What PLC model are you using ? CS/CJ Series see Omron Manual W340 section 3-17 for stack functions FIFO, LIFO, PUSH etc. Also the Manual W394 is a good read for these PLC's. CP Series, see Omron Manual W451 section 3-16 for similar functions. Let us know if you are using a different series of PLC. Note that the above manuals are freely available from Omron download sites. Nibroc

[Sleepy Wombat 27]

other alternative are DIST COLL and WSFT

[PLC4me 0]

I am using a CPM1A PLC

[beegee 7]

another option is to use indirect addressing DM50 for the pointer and increasing that value everytime you trigger the write procedure. (you can save multiple DM's by adding for instance 5 to DM50 each time you write) Don't forget to write a section to return to the beginning once your value gets too big. then you can use *D50 to write to. Beegee