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

Note: Forcing and downloads cannot be made on Safety 

controllers unless they are switched to the RUN/PROGRAM mode.

I/O Redundancy

CAUTION: For I/O redundancy, prefabricated cable length 

from RTP to Redundant UIO modules must be same.

• Flexibility in configuration

• I/O Redundancy RTP (Model No – 900RTI-0100)

Recipes

Recipes are groups of data defined by the user that are 

used to make multiple value changes in the controller 

through a single action. Function block types that accept 

recipe data and the quantity of recipes stored in the 

controller are listed in Table 2.

Recipes may also include Variables, which are dynamic 

analog and digital values used as inputs to standard and 

principal function blocks. Recipes may be loaded through 

the 900 Control Station operator interface by name or 

number, or via a dedicated recipe load function block and 

user configured logic.

Operator Interfaces

A ControlEdge HC900 controller can support up to three 

900 Control Station operator interfaces via Ethernet or 

Serial communications. The interface is configured with 

Station Designer software using a database 

import function to simplify the setup. See specification 

sheet 51-52-03-102 for more information on this 

interface.

Note: The old phased-out Control Stations (900CS10-

00/ 900CS15-00) will not support import of HC900 

software configuration file (*.cde) v7.1 and above. For 

HC Designer v7.1 and above please migrate to new

900CR series Control Stations with Station Designer 

v3.1.7100 and above.

Communications

HART IP – The HC900 controller supports industry 

standard HART (Highway Addressable Remote 

Transducer) protocol to integrate with asset manager 

(Currently it is qualified with Honeywell FDM).

HART supports two functionalities:

• HART IP client (FDM) communication

• HART Function Block communication

The controller enables the HART IP client to exchange 

information with HART field devices connected to the 

Al/AO channels in the controller via a HART-IP Server. 

Multiple HART IP clients can be served by the 

controller at the same time. When the HART IP client 

builds a HART command request and sends it to the 

TCP/IP port of the HART-IP server, the HART-IP 

server responds to the HART IP client with information 

from the field device. Since it takes time for the 

controller to communicate with the field devices 

through onboard or remote I/O cards, a delayed 

response mechanism is implemented. The TCP /IP 

port of the HART-IP server is user-configurable and 

the default port number is 5094. The end user may 

change the port number if firewall configuration is 

required.

The controller enables HART function blocks to access 

to the HART field devices through HART-enabled 

Al/AO channels. Currently HART command 3, 

command 48 and command X are implemented.

Remote I/O Rack Port (C50, C70, C75) – An Ethernet 

port is dedicated to supporting remote I/O racks. This 

10/100Base-T Connection on the C50 and C70 CPU 

supports a single direct connected remote rack or up 

to 11 remote racks when connected through an 

external Ethernet switch. The C75 CPU supports a 

single direct connected rack or up to 12 remote racks 

using external switches.

User Interface Support – The 900 Control Station interface 

may be connected via Ethernet or serial communications. Up 

to three interfaces may be connected to a controller for 

distances up to 328 feet (100Meters) via Ethernet or 2000 

feet (609 meters) between the controller and operator 

interface. 3rd party user Interface support is provided through 

an isolated RS485 port connection using Modbus/RTU 

protocol, or Ethernet with Modbus/TCP protocol.

Ethernet Modbus/TCP Communications –

ControlEdge HC900 controllers communicate with their host 

PC interfaces over an Ethernet 10/100Base-T communication 

network using the Modbus/TCP protocol, an open protocol 

interface available for most popular HMI software packages. 

The controllers Ethernet ports are MDIX and configured to 

auto negotiate and will default to half duplex if host fails to 

negotiate. The C30 supports up to 5 host connections while 

the C50/C70/C75 support up to 10 concurrent host 

connections over an Ethernet network for control supervision 

and data acquisition. The Designer software can also address 

any of the controllers concurrently over Ethernet for 

configuration monitoring, diagnostic interrogation, upload/ 

download, or on-line configuration changes. As a result, a 

ControlEdge HC900 network of controllers and operator 

interfaces can be partitioned into process segments to assure 

proper control performance. Each of these process segments, 

in turn, can be accessed via common HMI software within the 

plant environment using an Ethernet LAN.

Ethernet Peer to Peer Communications - Peer data 

communications between one ControlEdge HC900 controller