Honeywell HC900 Reference Guide

Function Blocks
DI Function Block
138 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
Example
HFigure 30 shows a Function Block Diagram using DI function blocks in a basic Series Parallel Circuit.
LS 1
LS 2
SOL 1
Coil
This is a basic series-parallel circuit. If Limit Switch 1
(LS1) is ON and Limit Switch 2 (LS2) is ON, or
if pushbutton PB1 is ON, then Solenoid 1 is turned ON,
otherwise it is OFF. Note “power flow” can be delivered
in either of two paths to the solenoid.
PB1
Equivalent Boolean Logic Expression
HC900 Logic
A
= LS1,
B = LS2
D = Output
(A * B) + C = D
A
ND Symbol
A
B
C
C = PB1,
OR Symbol
D
OR
This uses a basic 2 Input AND block
and a 2 Input OR block.
6 Function blocks are used.
AND
Figure 30 Digital input function block example

Honeywell HC900 Specifications

General

Series	HC900
Redundancy	Optional
Programming Language	Function Block Diagram, Ladder Logic, Structured Text
Inputs	Analog, Digital
Outputs	Analog, Digital, Relay
Display	Optional
Control	PID, Advanced Control
Power Supply	24V DC or 100-240V AC
Storage Temperature	-40°C to 85°C
Humidity	5% to 95% non-condensing
Communication Protocols	Modbus, Ethernet