Introduction - System Overview 
6    HC900 Process & Safety Controller Safety Manual  Revision 1.9 
    01/14 
 
Figure 2 – Expanded HC900 Controller Configuration 
 
The HC900 Controller design enables users and OEMs who are adept in system integration to assemble a 
system that fits a broad range of requirements. Any configuration can be readily modified or expanded as 
requirements dictate. In initial configuration and in subsequent modifications, the HC900 Controller affords 
an optimum balance of performance and economy. Configurations such as those shown in Figure 1 and in 
Figure 2, as well as many variations, can be assembled from modular components. Many of the 
components are available from Honeywell, and some are available from third-party suppliers. These 
modular components are available in any quantity and mix that make the most sense for a given 
application. As indicated in Figure 3, the HC900 Controller includes provisions for communication via 
Ethernet with host systems such as the Honeywell Experion HMI and other HMI software that supports 
Ethernet Modbus/TCP protocol. Also, the communication structure of the HC900 Controller enables 
remote placement of input/output components, allowing significant economies in cabling and wiring.