irondesk40
Member
we use fuji process temperature controllers on our equipment and looking at possibly replacing them and controlling temperature with the plc and temperature card. What would be the pros or cons? Thanks
The problem i see with it is that most of the technicians in the plants that work on our equipment do not know anything about plc's and if something is not working right with the temperature all they now have to do is either replace the heaters,temperature sensor or last resort pop a new controller in.
We have hundreds of machines with the Fuji controllers and they work great but he recently had a meeting with a machine manufacturer that we was looking at to build a machine for us that uses the Siemens plc (we use mostly Allen Bradley) and he told our director he could do it cheaper with the Siemens.
Keep the stand-alone controllers unless someone is prepared for a big cost in time for retraining your technicians.All they now have to do is either replace the heaters,temperature sensor or last resort pop a new controller in. If it is controlled by the plc and they replace the above components and still not working, then what? All of these plants are overseas.
Because the MicroLogix PLCs use essentially the same RSLogix500 software as the SLCs, then any temperature-control program written in RSLogix500 will be a good example. I have plenty of those. Do you want the entire *.RSS program. or a PDF print-out, or what would be most useful (maybe only the ladder file that has a temperature control routine)?Would anyone have a sample program using a Micrologix that they might would share?
Keep the stand-alone controllers unless someone is prepared for a big cost in time for retraining your technicians.
Because the MicroLogix PLCs use essentially the same RSLogix500 software as the SLCs, then any temperature-control program written in RSLogix500 will be a good example. I have plenty of those. Do you want the entire *.RSS program. or a PDF print-out, or what would be most useful (maybe only the ladder file that has a temperature control routine)?
If you use a type J thermocouple connected to a temperature transmitter which is then connected to a standard analog input module, then your assumptions are close.I would assume that the input card would give a range of something like 0-16383 if set up for PID and the temperature range for example was 32-900 degrees F, then 32 would equal 0 and 900 would equal 16383.
If you use a type J thermocouple connected to a temperature transmitter which is then connected to a standard analog input module, then your assumptions are close.
If instead you use the AB Thermocouple Input module, the Type J temperature range is -346 to 1400 degrees F. When you set up the module correctly, you can read the temperature directly with no other scaling being necessary.
Here is an example RSLogix program that should have everything you could have ever wanted to see as far as temperature control.