Figure 42 Hoa Function Block Example - Honeywell HC900 Reference Manual

Function Blocks
HOA Hand/Off/Auto Switch Function Block
Example
F igure 43 shows a Function Block Diagram using an HOA function block in conjunction with a Device
H
Control (DC) block and an external HOA switch for pump control. The level signal input and Compare
(CMPR) function are used to determine pump On/Off demand.
Level
Signal
Level
Setpoint
176

Figure 42 HOA function block example

HC900 Hybrid Control Designer Function Block Reference Guide
Feedback
Device
Control
Status
A
O
To Pump
H
A
O
H
External
Hand/Off/Auto
Switch
O
O
O
To Pump
O
O
O O
O
Revision 11
2/07