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

and up to 32 other ControlEdge HC900 controllers is 

supported over Ethernet via UDP protocol for safety/process 

data sharing. Both digital and analog data exchange are 

supported using peer data exchange function blocks, up to 

2240 (max 44 peer writes per modbus device) parameters 

between peer controllers. For SIL variants the safety peer 

function blocks can be used for Safety peer communication 

along with peer data exchange function blocks. No 

specialized software is required. Peer data can be given 

signal tag references for use in a control or data acquisition 

strategy. Peer to peer data interchange does not consume 

one of the host connections.

Serial Modbus RTU Communications - Serial Modbus 

RTU communications is available on the isolated RS485 (2 

wire) ports of the ControlEdge HC900 Controller CPU 

assembly in a Modbus Host or Device mode. The protocol of 

these ports is user selectable between ELN protocol for use 

with HC Designer software or Serial Modbus to interface 

with other compatible devices. 

Modbus RTU Device - Isolated RS485 ports

may be configured for simultaneous operation as a 

Modbus device port to allow each to communicate with 

a single Modbus host. 

The Modbus protocol supports read and write access 

to a default address map of certain function blocks and 

parameters.

In configurations 4.0 and later, a map of customized 

addresses, blocks and parameters can be created 

either by editing the default map or from scratch.

In the default map (fixed), a 4000 register array is 

available to allow the user to specify the address 

locations of specific controller data to optimize 

controller communications.

The data in the array may also be accessed in user 

specified formats (data types) such as analog data in 

Float 32, unsigned 16, signed 16, unsigned 32, signed 

32, and digital data in signed 16 or unsigned 16.

The data type selections in the 4000 register array 

provide compatibility with devices such as 3rd party 

touch panels. In the custom map, all data formats are 

adjustable.

Modbus RTU Host - Either of the ports may be 

configured as a Modbus RTU host, one per controller.

Up to 32 devices may be multi-dropped on the isolated 

RS485 port. Function blocks are available in the 

ControlEdge HC900 controller to allow the user to 

specify read and write operations to up to 32 external 

Modbus compatible modus device devices and up to 

1024 data points.

Modbus TCP Initiator – The Ethernet ports may be 

configured as a Modbus TCP initiator. Function blocks 

are available in the ControlEdge HC900 controller to 

allow the user to specify read and write operations to 

compatible modbus device devices for up to 1024 data 

points.

Profibus – The ControlEdge HC900 can access data from 

Profibus modbus device devices using a Modbus-toProfibus gateway device attached to the serial port of the 

controller. The gateway device is a Profibus Host on the 

fieldbus network and a Modbus device to the ControlEdge

HC900. The Profibus data is connected into the control 

strategy using Modbus function blocks. This application has 

been validated with a ProLinx 5104-MCM-PDPM gateway 

(from ProSoft® Technology).

E-mail Alarms/Events--ControlEdge HC900 alarms or 

events can be individually configured to send an e-mail 

alarm (or event) message to e-mail addresses with the 

assigned alarm priority.

• Number of e-mail addresses: 3 based on alarm 

priority

• From: Controller name (up to 16 characters)

• Subject: text (up to 32 characters)

• Content: date and time of alarm/event, alarm/event 

tag name, alarm/event state

• Message: 48 character text (for alarms only)

• Priority Levels: 4 for alarms, 1 for events

Controller Configuration Access –Designer software 

supports communicating with ControlEdge HC900

controllers using an Ethernet or serial connection using ELN 

protocol to support direct PC connection for configuration 

upload, download, debug and maintenance. Modbus RTU 

protocol is also supported through the serial port interface.

Once the ControlEdge HC900 controller has been 

configured using Designer Software, on-line configuration 

changes 

may be made while maintaining process control. 

Configurations may also be loaded into the controller via the 

Ethernet TCP/IP network from a host PC. On-line monitoring 

for program debug and on-line program edit functions are 

also supported via the Ethernet port.

Modem Access – Communications to the 

ControlEdge HC900 controller may be via an external 

modem connected to the controller’s using an 

RS485/RS232 converter. HC Designer software 

supports configuration upload, download and on-line 

edits via modem. When modem communication is 

selected, Modbus RTU communication timeouts are 

extended.

Experion Supervisory Software – Honeywell’s 

Windows 10 version is available when PC-based 

supervisory control and data acquisition is required.