Instantiation and Usage Example

Instantiation and Usage Example

This figure shows an instance of the FB_PID function block:

 

 

oA square signal is generated using the GEN, key parameters are SqrPeriod and SignalAmplitude.

oThe system to control is a simple first order filter, key parameters are SystemResponseTime and SystemStaticGain.

oA trace is done in open loop SystemResponse_1 and in closed loop using FB_PID function block.

Data of this example are:

 

 

Using the previous setting, the setpoint/open loop/closed loop answer is:

 

 

The input i_tCyclTime of the first order filters System_1 and System_2 (dataCyclTime) must have exactly the same value as the period of the POU in the MAST, here 50 milliseconds.

 

 

When the GEN MODE is changed from RECTANGLE to SINUS with the same other parameters, the Sinus answer is:

 

 

This figure shows the visualization of the FB_PID function block:

 

 

Detected Error State

This table describes some general detected errors:

NOTE: If the function block is disabled, outputs are set to zero.