Internet PLC Forum
General => Technical support => Topic started by: skj1402 on April 25, 2007, 04:28:30 AM
-
My master T100 needs to control a number of contacts within my T100 slave unit and I understand that I would need to use the 'Write Relays' command to do this. Within this command is a Channel # identifer, each channel containing 8 bits (maybe you wouldn't mind providing an example showing how relays are addressed and then turned on and off by using this command?).
However, I also note that there is a 'Write Single I/O bit' command (Wb) contained in the E10 manual, that can write to an individual bit. This appears not to contain a channel # identifier; only a bit position identifier. Can I therefore assume that I can't use this command within a T100, and if I can, how would I address the channel #'s?
-
"Write Relay" command "WR" will write to the internal relay channels in the slave PLC. Each relay channel is 8 bit.
E.g. if you execute "@xxWR0055nn*' where xx is the ID and nn is the FCS, what happens is that relay bit #1 to #8 will be turned ON alterately:
RELAY 8 7 6 5 4 3 2 1
binary 0 1 0 1 0 1 0 1 (HEX &H55)
If you execute "@xxWR01F0nn*'
RELAY 16 15 14 13 12 11 10 9
binary 1 1 1 1 0 0 0 0 (HEX &HF0)
Wb command is supported on M-series PLCs with firmware revision of r47 and above. You can view the command from the T100MD+ user manual:
http://www.tri-plc.com/MD-man.pdf
Look for page 4-16.
-
Thanks for those very useful examples. All is now made clear (except you got the Hex value equivalents the wrong way round. :)
As for the Wb command, this unfortunately wasn't contained in the blue User Guide manual that I received with my T100's, so thanks also for refering me to the updated version on your site, which I've swiftly printed out!! ;D
-
Thanks. Somehow when I cut and paste over I changed the wrong part :) Have corrected it in the last post to avoid confusing other readers.