Mdsw Function Block - Honeywell UMC800 Reference Manual

Function Blocks

2.35 MDSW Function Block

Description
The MDSW label stands for Mode Switch. This block is part of the Loops category. It looks like this
graphically on the Control Builder.
Function
Digital interface to control loops to select automatic or manual modes and/or local or remote setpoint.
Connects to PID, ON/OFF, CARB, or TPSC mode block input.
Inputs
AUTO = Automatic Output mode (OFF to ON* sets MDRQO to Automatic control mode)
MAN = Manual Output mode (OFF to ON* sets MDRQO to Manual control mode)
LOCAL = Local Setpoint mode (OFF to ON* sets MDRQO to Local Setpoint mode)
REM = Remote Setpoint mode (OFF to ON* sets MDRQO to Remote Setpoint mode)
* for one control cycle
Output
MDRQO (Mode Request Output ) = The output of this block must connect to the MDRQI input of a PID,
CARB, TPSC, or ON/OFF function block.
Block Properties
Double click on the function block to access the function block properties dialog box.
Block Order (Read Only)
You can change the assigned execution order number by selecting "Execution Order" in the "Configure"
menu and arrange the order to suit your control strategy.
98 Function Block Reference Guide
Continued next page
3/99