Function Blocks
LPSW Loop Switch Function Block
184 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
LPSW Loop Switch Function Block
Description
The LPSW label stands for Loop Switch.
This block is part of the
Loops category.
Function
Digital interface to control loops to initiate autotuning, change control action, force bumpless transfer,
select tuning set. It connects to a PID, TPSC, or CARB function block.
Inputs
^ATC
= Autotune Command (OFF to ON initiates Autotuning)**
CACT = Change Control Action (ON changes Control Action)
^FBT = Force Bumpless Transfer (OFF to ON Forces Bumpless Transfer)** Performs the same function
that occurs when the loop changes from Manual to Automatic mode. The loop will re-calculate the integral
term to normalize the PID algorithm to the current PV and SP. You could use this input to correct for a
reset wind-up condition that might have occurred when an input sensor failed and was replaced/corrected.
^TUN1 = Tune Set 1 (OFF to ON switches to Tune Set 1*)**
^TUN2 = Tune Set 2 (OFF to ON switches to Tune Set 2)**
* Switch to Tune Set 1 overrides concurrent command to switch to Tune Set 2
** Not available for ON/OFF function Block
Output
SWO
= The output of this block must connect to the SW1 input of a PID, CARB, and TPSC function
block.
Block properties
Double click on the function block to access the function block properties dialog box.
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