Amb Auto/Manual Bias Function Block - Honeywell HC900 Reference Manual

Function Blocks

AMB Auto/Manual Bias Function Block

AMB Auto/Manual Bias Function Block
Description
The AMB label stands for Auto/Manual Bias Function.
This block is part of the Loops category.
Function
On transfer from Manual to Auto; Bias is calculated to make PV + Bias = Output.
Inputs
= Process Variable Input (%)
PV1
= Output Track Value in percentage (Output = TRV Value when TRC is ON).
TRV
= Output Track Command—1 = enable TRV (Mode = Local Override), 0 = disable
TRC
MDRQI = External Mode Request (connected to the MDRQO output of a MDSW function block)
encoded as follows:
Outputs
= Control Output (–5 % to 105 %)
OUT
= Alarm 1
AL1
= Alarm 2
AL2
MODE = Actual Mode encoded as follows: (Connect to Mode Flags block [MDFL] to encode mode
status.)
Configuration parameters
The Auto/Manual Bias properties dialog box is divided into four tab cards
GENERAL
START/RESTART
RANGE/LIMIT
ALARMS
Click on the tab to access the properties for that tab.
64
0.0 = No Change
1.0 = Manual Mode Request
2.0 = Automatic Mode Request
4.0 LSP AUTO
5.0 LSP MAN
7.0 LSP LO (Local Override)
HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07