PL7 programming

[chrisk 0]

Hello all, I'm not really a PLC guy but I am helping to maintain and debug some TSX67's in a production environment. We have a TSX67/20 with an AES811 analog input card hooked-up to some pressure transducers and machine tachs. Looking at the program I'm having trouble understanding a certain line of code. The statement is: IF NOT IW0,2,3 THEN IW0,6->W1043->W15050 ELSE IW0,6->W1080 I'm not getting the IW0,2,3 part. It seems to always be 1 or 0 but is it an AND or an OR ? The second comma is not familar to me. Anyone out there who can explain this notation? TIA, chris

[acpi 11]

Hi, It's very basic but rather than a long speech a small image will be better to understand what it does. The IW0,2,3 is a bit from the IW0,2 word. On an AEM 811 card the channels are sampled one after the other using a multiplexing technique based on relays. This bit is probably used to test the active channel and then store the analog value in a word. For more information you shoud get the manual here : http://www.global-download.schneider-electric.com/85257849002EB8CB/all/D26C5C73F03A35A18525787000042567/$File/w913290350303a_k01_000_03.pdf JC Edited 24 Sep 2012 by acpi