Rockwell-automation DeviceLogix System User Manual Uživatelský manuál stáhnout pdf (Strana 28)

28 Publication RA-UM003B-EN-P - February 2010

Chapter 2 Navigate the Function Block Editor Interface

The PID function has Enable In and Process Variable as inputs, and

Enable Out and Control Variable as outputs, as described in the

following tables.

The PID function also provides four parameters that you can modify

as needed:

• Tuning

•Configuration

•Scaling

•Status

Tuning Parameters

Tuning Parameters allow you to set the PID algorithm parameters.

Input Type Default Description

Enable In BOOL 1 Enable In

PV REAL 0.0 Process Variable

Output Type Default Description

Enable Out BOOL 0 Enable Out

CV REAL 0.0 Control Variable

Parameter Type Range Default Description

Setpoint (SP) REAL 0.0 Desired control point of the process variable. It

should be scaled in the engineering unit.

Set Output % REAL 0.0 ~ 100.0 0.0 PID output for the manual set output mode. Use

this value to prevent bumps in control when

switching control mode back to automatic.

Output Bias % REAL 0.0 ~ 100.0 0.0 Output bias percentage

Control Gain (K

) REAL 0.0 Controller gain

Reset Time (T

)REAL 0.0 Reset time

Rate Time (T

) REAL 0.0 Rate time

Station Mode BOOL 0 Indicates the station mode:

• 0 = Manual

• 1= Automatic

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Rockwell-automation DeviceLogix System User Manual Uživatelský manuál Strana 28