Tim Ganz
Member
I need some help with scaling an analog input in an MicroLogix 1000 PLC with Analig IO. Its model # 1761-L20AWA-5A.
I have more of these machines to use as an example but the others are SLC processors and they are using the SCP instruction and it does not seem to be available in the Micrologix/ It has the SCL instruction but that does not appear to function like the SCP.
I have a set of load cells that are 0-1000 pounds and are 0-500mv as a set and they go into a signal conditioner that gives out a single 4-20ma signal to my analog input on the Micrologix 1000.
We have calibrade the signal conditioner and the analog inoput has a value to add of subtract from the analog input the move to the tension display but if you chnage that number so that it reads right at 1000 pounds it is way off when it should be zero. At zero load it's displating almost 400 pounds.
I think I need a way to calibrate the low 0 and the high 1000 pounds in the PLC Vs. just have a single offset fopr the analog value. I have not done any analog work at all and I really need some help.
I have more of these machines to use as an example but the others are SLC processors and they are using the SCP instruction and it does not seem to be available in the Micrologix/ It has the SCL instruction but that does not appear to function like the SCP.
I have a set of load cells that are 0-1000 pounds and are 0-500mv as a set and they go into a signal conditioner that gives out a single 4-20ma signal to my analog input on the Micrologix 1000.
We have calibrade the signal conditioner and the analog inoput has a value to add of subtract from the analog input the move to the tension display but if you chnage that number so that it reads right at 1000 pounds it is way off when it should be zero. At zero load it's displating almost 400 pounds.
I think I need a way to calibrate the low 0 and the high 1000 pounds in the PLC Vs. just have a single offset fopr the analog value. I have not done any analog work at all and I really need some help.