QUOTE (Crossbow @ Aug 15 2009, 10:10 AM)

I've been asked this question about Mitsubishi and others before. KEEP is like a set/reset, but a reset will reset all of the KEEP bits, not just one. There are ways to write a similar function in code, but there is no KEEP instruction or equivalent I have found in Modicon, Mitsubishi, Idec, or Siemens S7-200.
Crossbow, I did a quick research for the keep instruction.
I found that it's the same SET / RESET but in only one block with the RESET priority.
Joao should use the SET COIL and RESET COIL for his logic, for compatibility with other PLC brands, like Schneider, Rockwell and Siemens and for ease readability/maintenance by other technicians.