HoneywellControlEdge HC900 Controller Specifications 51-52-03-31, January 2022

e300 32 Bit RISC based PowerPC Architecture. The 

controller operates out of a battery-backed DDR2 64MB 

memory for C30 and C50 modules, 128MB for C70 and

C75 modules. DDR2 memory on all modules is 

supported with ECC circuitry to enhance reliability and 

error detection.

Program execution environment is protected using an 

independent watchdog timer.

• All ControlEdge HC900 CPU modules offer open Ethernet 

communications for access by a variety of HMI and 

SCADA software applications and peer to peer 

communications for control data exchanges between 

controllers. The C70 and C75 provide dual Ethernet ports 

for high network availability installations.

• ControlEdge HC900 CPU modules use a dual scan 

method to handle fast digital scanning and normal analog 

input scanning in the same integrated control 

environment. Both scans support a wide range of 

computational function block algorithms and a user 

adjustable execution sequence order.

ControlEdge HC900 CPUs use Flash memory for 

permanent user configuration program storage 

and battery-backed memory for dynamic data 

storage allowing for graceful recovery following a 

power interruption or other discontinuous 

operations. Using proven TL5903 primary 

batteries to support up to 24 days of continuous 

power outages

• 5000 SOE event buffering capability

I/O Scanners

ControlEdge HC900 Remote I/O is processed and 

communicated to the main CPU module through a 

remote I/O Scanner module. Two I/O scanner modules 

are available: a single port model for non-redundant 

CPU systems and a dual port model for redundant 

CPU systems. Scanner addressing in multi-rack 

systems is selectable via DIP switch setting.

Program execution environment is protected using an 

independent watchdog timer.

Inputs and Outputs - A variety of I/O modules are 

available for selection in creating a custom control 

solution. These include:

• 8-point universal analog input modules: Inputs 

may be mixed on a module and may include 

multiple thermocouple types, RTDs, ohms, 

voltage, current or millivoltage types – all easily 

assigned using the Designer configuration tool.

High point-to-point isolation simplifies installation 

and saves the expense of external isolation 

hardware. 

• 16-point high level analog input module: each 

point is configurable for V or mA. Point-to-point 

isolation.

• 4-point galvanically isolated analog output 

module: Supports from 0 to 20mA each.

• 8-point analog output module. Galvanically

isolated in two groups of 4. Supports 0 to 20mA.

• 16-point (14-point for redundant configuration) 

Universal I/O module galvanically isolated Input/ 

Output to chassis. Each point can configured as 

DI, DO, AI or AO.

• 16-point digital galvanically isolated AC/DC input 

module.

• 16-point analog output module. Galvanically isolated in 

four groups of 4. Supports 0 to 20mA.

• 16-point digital galvanically isolated input modules: 

Contact closure type, DC voltage and AC voltage types.

• 32-point galvanically isolated digital input (sink) module: 

DC voltage

• 8-point AC or 16 point galvanically isolated DC digital 

output (sink) modules

• 32-point galvanically isolated digital output (source): DC 

voltage

• 8-point galvanically isolated high voltage

• 8-point galvanically isolated relay output module: four 

form C type and four forms A type relays.

• 4 channel Pulse/ Frequency/Quadrature I/O module

See Module Specifucation sheet 51-52-03-41 for details.

Insert & removal of I/O under power - For ease of 

maintenance, the ControlEdge HC900 controller supports 

removing and inserting modules from the card rack without 

removing power from the controller. Each card is sensed for 

validity by the controller and auto-configured on insertion.

Hardware can be replaced without shutting down operations 

for replacement of CPU or Scanner modules thus reducing 

downtime and total cost of ownership.

I/O Terminal Blocks – 20-screw Terminal Blocks 

are available with either barrier style or Euro style screw 

connections. A module label area is provided for field wiring 

identification. An available 36-screw Euro Terminal block is 

required for certain high capacity modules. 

Remote I/O - I/O racks may be remotely mounted 

from the controller via a dedicated Ethernet 10/100Base-T 

connection at up to 300 meters (984 feet) between the 

controller and the most remote rack using two Ethernet 

switches. Use of fiber optic cable extends distance to 40 

Kilometers.

Remote Terminal Panels - Optional DIN rail mounted 

Remote Terminal Panels (RTPs) are available for use 

with pre-wired cables to reduce installation time and 

labor expense. RTP types available: analog input, 

relay output, discrete input, discrete output, analog 

output.

Three cable lengths are also available to match 

hardware to installation variations. See Module 

Specification sheet 51-52-03-41 for more details.