kf4sqb
Member
Hi, all!
I have a 1768-L45 CompactLogix PLC with a couple of 4-20 temperature transmitters connected to it. I have the temperature scaling working, and the desired readouts on an HMI. I am using an AOI from AB, called "Analog_Scale" to handle the scaling, and can adjust the parameters of the AOI, namely Analog_Min_In and Analog_Max_In to adjust the scaling, while online with the controller through RSLogix 5000. However, I can't for the life of me figure out how to change the parameters from within the ladder logic. More specifically, I want to be able to set up a numeric input on the HMI to be able to adjust the scaling from there. I've tried using a MOV command, and it does write the new value to the parameter file, but it will not populate into the actual instruction on the ladder, and as soon as I make the rung the MOV command is on false, the parameter file goes back to what it was before I made the MOV true. Any ideas on how to achieve what I want? Thanks!
I have a 1768-L45 CompactLogix PLC with a couple of 4-20 temperature transmitters connected to it. I have the temperature scaling working, and the desired readouts on an HMI. I am using an AOI from AB, called "Analog_Scale" to handle the scaling, and can adjust the parameters of the AOI, namely Analog_Min_In and Analog_Max_In to adjust the scaling, while online with the controller through RSLogix 5000. However, I can't for the life of me figure out how to change the parameters from within the ladder logic. More specifically, I want to be able to set up a numeric input on the HMI to be able to adjust the scaling from there. I've tried using a MOV command, and it does write the new value to the parameter file, but it will not populate into the actual instruction on the ladder, and as soon as I make the rung the MOV command is on false, the parameter file goes back to what it was before I made the MOV true. Any ideas on how to achieve what I want? Thanks!