Function Blocks
TPSC (3POS) Function Block
Revision 11 HC900 Hybrid Control Designer Function Block Reference Guide 409
2/07
TPSC (3POS) Function Block
Description
The TPSC (3POS) label stands for Three Position Step Control operation.
This block is part of the
Loops category.
Function
This block combines a PID controller with 3 position step control output functions to provide motor
position control without position sensing. Allows the control of a valve or other actuator having an electric
motor driven by two digital output channels; one to move the motor upscale, the other to move it
downscale, without a feedback slidewire linked to the motor shaft.
Inputs
PV
= Process Variable Analog Input value in Engineering Units
RSP = Remote Setpoint Analog Input value in Engineering Units or Percent
TRV = Output Track value in Percentage (PID Output = TRV Input when TRC = ON.)
TRC = Output Track Command [ON, OFF] (On -Enables TRV) (Mode = Local Override)
BIAS = Remote Bias value for Ratio PID
SWI = Switch Inputs (from SWO on LPSW function block)
0 = No Change
1 = Initiate Autotuning
2 = Change Control Action
4 = Force Bumpless Transfer
8 = Switch to Tune Set 1
16 = Switch to Tune Set 2
MDRQI = External Mode request (typically connected to the MDRQO output of a MDSW function block.
0 = No Change
1 = Manual Mode Request
2 = Auto Mode Request
4 = Local Mode Request
8 = Remote Mode Request
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