Honeywell HC900 - Functional Description; Figure 1 - Small HC900 Controller Configuration

Introduction
Revision 6 HC900 Process & Safety Controller User and Installation Manual 9
21 April 2017
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.
Although the HC900 E1/E2 ports provide protection against Cyber-security/DOS type attacks, additional protection
is required for safety applications using a firewall device configured to prevent uncontrolled messages into the
controller. Please refer to Ethernet Devices/Considerations Section in this manual for further information. The
figures in this manual assume the firewall is installed properly above the controller's Ethernet connection(s) E1 and
E2.
Figure 1 – Small HC900 Controller Configuration