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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.