Honeywell HC900 Reference Guide

Function Blocks
4ADD Function Block
12 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
4ADD Function Block
Description
The 4ADD label stands for Addition Mathematical Operation (4 Inputs).
This block is part of the Math category.
Function
Add FOUR inputs (X, Y1, Y2, and Y3) to get an output.
• OUT = X+ Y1+ Y2 + Y3
Input
X =First Analog Input
Y1 = Second Analog Input
Y2 = Third Analog Input
Y3 = Fourth Analog Input
ATTENTION
All 4 inputs must be connected or unused inputs inverted. If only 3 inputs are used, the 4
th
value should be inverted or connected to a constant value of 1.0.
Output
OUT = Sum of the analog values
4ADD example
HFigure 3 shows a Function Block diagram using a 4ADD function block to find the total Flow rate as the
sum of Flow 1, Flow 2, Flow 3, and Flow 4.
Figure 3 4ADD 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