Special Hardware Requirements:
- One S7-200 PLC (CPU 215 or CPU 216)
- One EM235 expansion module, analog combination AI 3/AQ 1 x 12 bits
- One TD 200 (version 1.1 or later)
- One TD/CPU Cable (included with TD 200)
The following S7-200 program provides an example of how to use the PID Loop instruction. The example includes the operator interface for driving a SIMATIC TD 200 text display, a process simulation routine that provides a large delay, both an analog output value and a digital output for duty cycle control, and high and low level alarm limits on the process variable (PV).
TD 200 Messages The TD 200 provides the following three message displays: Program Flowcharts: Program Flowcharts:
Download Program Example 
