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

totalizer, free-form math, average, mass flow, function 

generator, periodic timers based on real-time, carbon 

potential, RH, Dew Point, signal selection, comparison, 

gas flow, real time clock, and many others. These 

blocks may be configured to create control schemes 

that precisely address the needs of your process. 

Digital status outputs are also provided on many of the 

analog function blocks to facilitate intelligent signal 

alarming and default operation strategies. 

Typical logic function blocks include AND, OR, XOR, NOT, 

Latch, Flip-flop, On/Off Delay and Resettable timers, 

Counters, Free-form Boolean logic and more. The execution 

of analog and digital functions is seamlessly integrated into 

a single control strategy in the controller. 

AI-V – The new AI-V function blocks will allow 1oo2 and 

2oo3 voting for inputs and compares its values with one 

another and reports any deviation if validation between one 

another fails. Output value is calculated by comparing all 

inputs channels and selecting best of three. 

DI-V - The new DI-V function blocks will allow 1oo2 and 

2oo3 voting for inputs voting for inputs and compares its 

values with one another and reports any deviation if 

validation between one another fails. Output value is 

calculated by comparing all inputs channels and selecting 

best of three.

AO-V – The AO-V block is similar to the AO block but it 

provides additional functionality which allows users to 

validate the status of the output using a feedback input 

channel. The primary function of this block is to validate the 

feedback signal and provides indication when input fails to 

match the output due to possible reasons such as field 

power failure, cable failure, fuse etc. The function block will 

also check the feedback input signal for input module error, 

failed input channel and loss of feedback module 

communications. 

DO-V - The DO-V block is similar to the DO block but it 

provides additional functionality which allows users to 

validate the status of the output using a feedback input 

channel. The primary function of this block is to validate the 

feedback signal and provides indication when input fails to 

match the output due to possible reasons such as field 

power failure, cable failure, fuse etc. The function block will 

also check the feedback input signal for input module error, 

failed input channel and loss of feedback module 

communications.

Alarms/Events

Alarms and events represent changes in digital status that 

require user notification. The ControlEdge HC900 controller 

supports an internal alarm annunciation system that may be 

setup to operate via e-mail to a remote computer (see 

Communications, E-mail Alarming). Up to 360 alarm points 

per controller may be grouped in 30 groups of 12.

Events are digital status changes that cause messages to 

be presented on the 900 Control Station operator interface. 

Controller events may prompt e-mail messages, 

do not require acknowledgement, and are reported and 

logged in a separate group. Up to 64 event points are 

supported in a controller.

Alarms and events are time stamped in the controller to a 

one second resolution.

Sequence of Event (SOE)

SOE is a mechanism for recording and determining the 

order (sequence) of digital state changes (on DI 

channel). High-resolution SOE uses 1 msec time 

stamping. SOE display tool (historian or control station) 

shall map the SOE event properties from signal 

number in configuration file.

Note: 

• SOE is supported only in non-redundant UIO

configuration.

• As of now SOE events across controllers may not be 

correlated properly as there is no time sync across 

controllers

Configuration

Controller configuration is performed using Designer 

Configuration software on a PC operating with 

Windows™ 7 (32-bit and 64-bit), Windows™ 8.1 (32-bit 

and 64-bit), Windows™ 10 (32-bit and 64-bit), Windows 

Server 2016, and Windows Server 2019. Configuration 

files are built independently on the PC and downloaded to 

the controller in a separate operation. 

Validation of proper physical I/O to support the 

configuration is provided along with appropriate warnings. 

Configuration Back-build - In the event a PC 

configuration file is lost or misplaced, it can be easily 

reconstructed using the upload function of the Designer 

configuration software. Simply read the configuration 

from the controller to exactly duplicate the original 

configuration, including all text descriptions. 

Configuration edit - In the event edits to a controller’s 

configuration are required after the unit is in operation, an 

uploaded file may be monitored during process operation, 

edited, and downloaded with the on-line download function 

of the Designer. The software allows configuration changes 

while in the Run mode, limiting process disturbances.