Control Link
From SysCAD Documentation
Navigation: Main Page -> Models -> Process Control Models
Contents |
General Description
When the following units are linked together using the insert link function, a control link is made.
- Transmitter & PID control measured value
- PID control output value & Valve opening (dynamic only)
- PID control output value & Pump speed (dynamic only)
- PID control output value & Actuator (mainly for dynamic)
Diagram
Model Theory
The transmitter model can be connected to a PID unit by a control link. To connect, use the insert link function, and select the transmitter as the source and the PID meas(ured value) as the destination. When the connection is made, the transmitter tag will be automatically put into the PID control block.
The PID unit can be connected to a valve/pump/actuator by a control link. To connect, use the insert link function, and select the PID output value as the source and the valve/pump/actuator as the destination. When the connection is made, the PID output tag will be set to the valve opening/pump speed/actuator tag.
Note: valve opening and pump speed will use fractions only.
Data Sections
The default sections and variable names are described in detail in the following tables. The default Control link access window consists of one section.
| Tag / Symbol | Input / Calc | Description |
|---|---|---|
| On | Tick Box | The control link will be enabled or disabled using this box. |
| Value | Output | The input variable's value. |
| SrcIO | Output | The tag of the source unit. |
| DstIO | Output | The tag of the destination unit. |
Adding this Model to a Project
Insert into Configuration file
Sort either by DLL or Group.
|
|
DLL: |
Control1.dll |
→ |
Units/Links |
→ |
IO - CtrlLink |
|
or |
Group: |
General |
→ |
Units/Links |
→ |
IO - CtrlLink |
See Project Configuration for more information on adding models to the configuration file.
Insert into Project
See Insert Unit for general information on inserting links.
