Honeywell HC900 Reference Guide

Function Blocks
PID Function Block
Revision 11 HC900 Hybrid Control Designer Function Block Reference Guide 289
2/07
Example 3 - Cascade control
The Cascade loop uses 2 PID blocks with the Back Calculation pin of the secondary connected to the
primary loop. This transfers values back to the primary loop to adjust the PID for changes due to manual
control.
Figure 73 Cascade control 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