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

of your configuration (that is, function blocks) can be 

allocated for recipes. As long as memory is available, 

allocate as many recipes as needed. 

The rule of thumb is 

Max. number of recipes = Recipe memory allocation ÷

memory per recipe

Configuration memory allocation

The configuration memory comprises one allocation for the 

function block configuration and one allocation for recipes. 

In general,

Total configuration memory = 

Configuration + Recipe allocation

Whatever memory has not been allocated to recipes is 

available for your configuration. By changing the size of the 

recipe pool allocation, you control the amount of memory 

available for recipes and therefore configuration. Need a 

small configuration but many recipes? Allocate more recipe 

space. Need a large configuration but few recipes? 

Allocate less recipe space

Where are usage/capacities presented?

File Properties in Designer displays statistics on 

usage/availability of:

• configuration memory (recipes + function 

block configuration), 

• dynamic memory (function block configuration 

only)

• fast scan time,

• Normal scan time,

• Normal CPU% used,

• Fast CPU% used,

• Each component of a configuration (variables, 

constants, etc.).

Controller Data Storage

The controller may log process data values in the available 

memory that is not used by the configuration. Up to 250 

signal values may be logged in a rotating buffer using three 

different sample rates with oldest data being replaced with 

new data after the buffer is full.

Data is extracted from the controller using HC Historian data 

harvesting software via Ethernet or Serial connection.