Introduction - Functional Description 
Revision 19   HC900 Process Controller Installation and User Guide  7 
06/14 
Functional Description 
All Controllers 
The Honeywell HC900 Process Controller is an integrated loop and logic controller that is designed 
specifically for small-and medium-scale unit operations 
It comprises a set of hardware and software modules that can be assembled to satisfy any of a broad range 
of process control applications.  The HC900 Process Controller can consist of a single rack, as indicated in 
Figure 1, or can be can be networked with other controllers via Ethernet links to expand the dimensions of 
control over a wider range of unit processes, as indicated in Figure 2. 
 
 
Figure 1 – Small HC900 Controller Configuration