lalion
Member
Hi,
I have a customer with an ancient modicon plc that is not going into run mode, Gould Micro84 (M84A-002). I cant find any run switches on it and dont have the programming unit so cannot plug in and program, so its looking like I will need to put in a new plc.
This leads to my next problem, Ive been given a print out of the program and I/O, I can understand most of it but a couple things have caught me.
1) There are several internal memory registers that I cant find controlled anywhere, 2201, 2202, 2203, 2204. I can only assume these a dedicated registers for startup/etc?
2) There are a lot of rectangles drawn, which I assume are timers? Refer below diagram. Can anyone give insight to this logic, or show me where I can get documentation.
Thanks, Leon
------|
| 5 |
| |
|T0,1 |
| |
|4014 |
------|
I have a customer with an ancient modicon plc that is not going into run mode, Gould Micro84 (M84A-002). I cant find any run switches on it and dont have the programming unit so cannot plug in and program, so its looking like I will need to put in a new plc.
This leads to my next problem, Ive been given a print out of the program and I/O, I can understand most of it but a couple things have caught me.
1) There are several internal memory registers that I cant find controlled anywhere, 2201, 2202, 2203, 2204. I can only assume these a dedicated registers for startup/etc?
2) There are a lot of rectangles drawn, which I assume are timers? Refer below diagram. Can anyone give insight to this logic, or show me where I can get documentation.
Thanks, Leon
------|
| 5 |
| |
|T0,1 |
| |
|4014 |
------|