The fourth program requirement requires if the Mill motor temperature goes above 80 degrees C, the mill should be stopped to protect the windings.
The input from the temperature transmitter will need to be scaled to produce a value in engineering units, in this case, degrees C.
The “SCALING” instruction is in the “Advanced Math” tab of the instruction selection window. The instruction is abbreviated “SCP”.
The 0-10 Volt DC analog inputs on the MicroLogix 1100 PLC are 10-bit analog inputs, meaning the value of the input as registered in the input table will be in the range of zero to 1023.
Using this data and checking the temperature transmitter configuration to find the transmitter range, we will configure the scaling instruction.