(8{)} ( .)
Lifetime Supporting Member
Hi All,
We've been down this road several times before but I want to get this off of my chest. Here goes.
I am not a big fan of sequencer instructions. It's not that the is anything inherently bad about them it's just that I keep running across these agrivating PLC-2 programs. I just wrapped up such a project, hence the post.
Let's be more specific. One of our bread-and-butter job sources is retro-fitting PLC-2 processors. We usually upgrade them to SLCs. The problem is, time and time again I run across programs that are written to service sequencer instructions which, unexplicably, happen to run the process.
For some reason, the programs that I run across manipulate the sequencer masks and sequencer data. These programs are unservicable. Whenever I run across a customer with one of these applications he invariably informs me that the process is unbelievably complex blah, blah, blah, when actually, it's only the code that is satanic.
Typically I re-write the programs, cooking down the sequencers to simple ladder code, thus putting them out of their misery. The results are programs that are usually 1/3 to 1/4 of the size of the original and, Great Googly Moogly!, readable.
Cheers,
(8{)} ( .)
(Yosi)
We've been down this road several times before but I want to get this off of my chest. Here goes.
I am not a big fan of sequencer instructions. It's not that the is anything inherently bad about them it's just that I keep running across these agrivating PLC-2 programs. I just wrapped up such a project, hence the post.
Let's be more specific. One of our bread-and-butter job sources is retro-fitting PLC-2 processors. We usually upgrade them to SLCs. The problem is, time and time again I run across programs that are written to service sequencer instructions which, unexplicably, happen to run the process.
For some reason, the programs that I run across manipulate the sequencer masks and sequencer data. These programs are unservicable. Whenever I run across a customer with one of these applications he invariably informs me that the process is unbelievably complex blah, blah, blah, when actually, it's only the code that is satanic.
Typically I re-write the programs, cooking down the sequencers to simple ladder code, thus putting them out of their misery. The results are programs that are usually 1/3 to 1/4 of the size of the original and, Great Googly Moogly!, readable.
Cheers,
(8{)} ( .)
(Yosi)