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Automating Manufacturing Systems - Process Control and ...

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plc pid - 25.23<br />

5. Logical control is more popular because the system is more controllable. This means either<br />

happen, or they don’t happen. If a system requires a continuous control system then it will tend<br />

to be unstable, <strong>and</strong> even when controlled a precise values can be hard to obtain. The need for<br />

control also implies that the system requires some accuracy, thus the process will tend to vary,<br />

<strong>and</strong> be a source of quality control problems.<br />

6.<br />

FS<br />

BT9:1/EN<br />

BT9:2/EN<br />

BT9:1/DN<br />

BT9:0/EN<br />

BTW<br />

Rack 0<br />

Group 0<br />

Module 0<br />

<strong>Control</strong> Block BT9:0<br />

Data N7:0<br />

Length 37<br />

Continuous No<br />

BTR<br />

Rack 0<br />

Group 0<br />

Module 0<br />

<strong>Control</strong> Block BT9:1<br />

Data N7:37<br />

Length 20<br />

Continuous No<br />

BTW<br />

Rack 0<br />

Group 1<br />

Module 0<br />

<strong>Control</strong> Block BT9:2<br />

Data N7:57<br />

Length 13<br />

Continuous No<br />

CPT<br />

Dest N7:57<br />

Expression<br />

"0.02154*(N7:41-F8:0)"<br />

www.PA<strong>Control</strong>.com

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