sparkyinak
Member
This is real generic question with too many variables like the multitudes of different PLC's. It's just for ghits and siggles, for I think for a interesting discussion
Let's say you have have this machine that makes widgets. It's not a complex process like petrochemical mixing or running a smelting plant but widgets are the companies bread and butter and the process is complex enough that warrants a reliable PLC. The manufacturer of the widget machine worked with you to develope the machine. The PLC required 40 or so I/O's which they listen to your recommendations for a PLC preference for whatever your reasoning is.
Years later the widget machine is still punching out widgets day in and day out. Suddenly the PLC gives up the ghost. Total lost failure and need replacement, like yesterday. You Are handed the job to replace it, and I need the widget maker back up and running like yesterday.
Not to make anyone or company look bad here, answer the following reasonable as possible from you are at in the industry, like plant electrician, general electrical contractor, specialty contractor, manufacturer rep, etc. This is just strictly out of chariousity as a sit here on the mend.
Questions to be answered:
1. What 40 or so I/O's reliable PLC did you recommend for the widget maker and why?
2. The PLC you specified, are replacement PLC are stock on site?
3. If no to 2, what is locally available or expressed freighted in from afar?
4. How much time would it take you to replace in kind the PLC from answer 1 to get the machine operationally ready? So the time here must include the time for everything from unwiring and removal of the bad PLC, wire labeling, notes, whatever to safely rewire the PLC, install new PLC, reterminate all wiring properly, testing a must(which was 100% correct, (good job), program, verify, etc. The clock stops when widget maker is release for production.
Let's say you have have this machine that makes widgets. It's not a complex process like petrochemical mixing or running a smelting plant but widgets are the companies bread and butter and the process is complex enough that warrants a reliable PLC. The manufacturer of the widget machine worked with you to develope the machine. The PLC required 40 or so I/O's which they listen to your recommendations for a PLC preference for whatever your reasoning is.
Years later the widget machine is still punching out widgets day in and day out. Suddenly the PLC gives up the ghost. Total lost failure and need replacement, like yesterday. You Are handed the job to replace it, and I need the widget maker back up and running like yesterday.
Not to make anyone or company look bad here, answer the following reasonable as possible from you are at in the industry, like plant electrician, general electrical contractor, specialty contractor, manufacturer rep, etc. This is just strictly out of chariousity as a sit here on the mend.
Questions to be answered:
1. What 40 or so I/O's reliable PLC did you recommend for the widget maker and why?
2. The PLC you specified, are replacement PLC are stock on site?
3. If no to 2, what is locally available or expressed freighted in from afar?
4. How much time would it take you to replace in kind the PLC from answer 1 to get the machine operationally ready? So the time here must include the time for everything from unwiring and removal of the bad PLC, wire labeling, notes, whatever to safely rewire the PLC, install new PLC, reterminate all wiring properly, testing a must(which was 100% correct, (good job), program, verify, etc. The clock stops when widget maker is release for production.