Function Blocks
AMB Auto/Manual Bias Function Block
64 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
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
PV1 = Process Variable Input (%)
TRV = Output Track Value in percentage (Output = TRV Value when TRC is ON).
TRC = Output Track Command—1 = enable TRV (Mode = Local Override), 0 = disable
MDRQI = External Mode Request (connected to the MDRQO output of a MDSW function block)
encoded as follows:
0.0 = No Change
1.0 = Manual Mode Request
2.0 = Automatic Mode Request
Outputs
OUT = Control Output (–5 % to 105 %)
AL1 = Alarm 1
AL2 = Alarm 2
MODE = Actual Mode encoded as follows: (Connect to Mode Flags block [MDFL] to encode mode
status.)
4.0 LSP AUTO
5.0 LSP MAN
7.0 LSP LO (Local Override)
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.
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