Honeywell HC900 User Manual

Introduction - Functional Description
Revision 19 HC900 Process Controller Installation and User Guide 9
06/14
Redundancy
Figure 3 – Single process with redundancies
 Redundant CPUs - Redundancy is provided by two C75 CPUs operating in a controller rack; this rack has no
I/O. A Redundancy switch module (RSM) sits between the CPUs.
 Redundant CPU Power - Two power supplies, one for each C75 CPU.
 Redundant CPU-I/O connection – Each CPU has its own 100 base-T Ethernet physical communication link with
one or more racks of I/O. Multiple I/O racks require Ethernet switches.
 I/O racks – 5 racks shown, top to bottom: 4-slot w/1 power supply, 8-slot w/1 power supply, 12-slot w/1 power
supply, 8-slot w/redundant power supplies, 12-slot w/redundant power supplies. A Power Status Module (PSM) is
required with redundant power supplies. High and low capacity power supplies are available.

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