Honeywell HC900 - Ethernet Switch indicators

Function Blocks
HOA Hand/Off/Auto Switch Function Block
176 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
Example
HFigure 43 shows a Function Block Diagram using an HOA function block in conjunction with a Device
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.
O
O
O
O
O
O
O
O
A
O
H
A
O
H
To Pump
To Pump
External
Hand/Off/Auto
Switch
Device
Control
Status
Feedback
Level
Signal
Level
Setpoint
Figure 42 HOA function block example