Publication 1747-RM001G-EN-P - November 2008
Proportional Integral Derivative Instruction 9-25
Use the following values in an SCP instruction to scale control variables to
common analog outputs.
Example
The following ladder diagram shows a typical PID loop that is programmed in
the STI mode. This example is provided primarily to show the proper scaling
techniques. It shows a 4 to 20mA analog input and a 4 to 20mA analog output.
The following parameters are:
• STI subroutine file (S:31) = 3.
• STI Setpoint (S:30) = 10.
• STI Enabled bit (S:2/1) = 1.
Table 9.40 SCP Instruction
Parameter 4 to 20mA 0 to 5V 0 to 10V
Input minimum 0 0 0
Input maximum 16383 16383 16383
Scaled minimum 6242 0 0
Scaled maximum 31208 16384 32764
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