Cutler-Hammer D320 PLC, Руководство пользователя

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D320 PLC User's Manual
PID Example
Description
The difficulties involved with set up of PID loop control include the problem of simulating a real-
world closed-loop process. One method of simulating such a process is through the use of an RC
(resistor-capacitor) network between an analog input (the process value) and an analog output (the
control output value). The RC circuit introduces a response delay between the analog output voltage,
and the voltage seen at the analog input, providing a reasonable model of a real-world process.
For this example, a D320 PLC is assembled consisting of the following: 5-slot rack, power supply,
D320 CPU, 3 digital I/O modules, a 0-10V Analog Output module, and a 0-10V Analog Input module.
Channel 0 of the analog input module is connected to channel 0 of the analog output module by the RC
network mentioned above. This configuration is illustrated in Figure 2.
Figure 2. PID Example PLC Setup