Spectrum Controls 1746sc-INI4vi - Manual (Page 43)

Programming Examples
Read this chapter to familiarize yourself with how to use the advanced
features of your module for:
• PID control
• user-defined scaling
For information on how to use the Allen-Bradley Advanced
Programming Software (APS) to create ladder programs, see the Getting
Started Guide For APS.
PID Control Your input module was designed to work directly with the SLC 5/02, 5/
03, and 5/04 PID instruction—without an intermediate scaling operation.
Use the input channel data as the process variable in the PID instruction.
Example — Suppose your input module is in slot 3, and you have a level
sensor with a 4–20 mA range connected to channel 0. The following
figures show you how to use it for PID control:
Figure 11. PID control example.
4–20 mA
Level
Sensor
Analog Output
Module (slot 1)
1746sc-INI4i
Analog Input
Module (slot 3)
Valve
Analog Input Signal (channel 0)
Analog Output Signal
Chapter 5