I/O Implementation Requirements Include; Ethernet Open Connectivity Network - Honeywell HC900 User And Installation Manual

I/O implementation requirements include:


Constructing a configuration file, and loading it into the Controller Module. This file includes I/O
numbering assignments for each I/O Function Block regarding Rack Number, Module Number ("slot"
number, or position in the rack, starting from the left), and Channel Number.

Physically assigning Rack Numbers, by positioning DIP switch settings in the Scanner Module for each
rack.

Placing the appropriate module type in each slot in each rack.
The I/O expansion network uses Honeywell private protocol that optimizes I/O performance and security.
The configuration and operation of the I/O expansion network is automatic, it is entirely under control of
built-in private software that resides in the Controller Module and in each Scanner Module included in the
HC900 system. The controller examines the control strategy stored in its memory, verifies that the physical
configuration (Rack Numbers and I/O Module type- by Module Number) matches the stored control
strategy, and establishes communication with each of the I/O modules in each of the I/O racks.
I/O Expansion Network (C75 /C75S)
I/O for redundant controllers is the same as I/O Expansion Network page 33, with the following
exceptions/notes.

In Figure 18, any of the racks shown in each controller configuration can be 4-, 8- or 12-slot versions.
Redundant I/O power not available with 4-slot.

Double the amount of Switches and Ethernet cables are required to configure the redundant I/O Link.

Maximum of 2 switches between each CPU (CPU A and CPU B) and the I/O racks.

Ethernet Open Connectivity Network

The configuration of the Ethernet Open Connectivity Network varies with specific applications in purpose
and in complexity. In some applications, configuration is straightforward and within the capabilities of
experienced installation technicians. In other applications (for example, those that include inter-connection
to other networks such as Intranet and Internet), a working knowledge of networking is required.
The Ethernet Open Connectivity Network for a given HC900 Controller enables:

Redundant Networks.

Peer-to-peer communication (Safety peer communication for SIL controller from release 6.300)

Connection to other PC hosts

Inter-connection to other networks (such as for sending Alarm/Event messages via e-mail.)

These ports are to be considered part of the control network layer and as such care must be taken to
reduce exposure to uncontrolled network influences. A properly configured firewall such as the
MOXA EDR-810 is recommended to help mitigate.
CAUTION
Communications lockout is possible in high network traffic conditions.
Extraneous traffic is possible when sharing bandwidth with other devices. We recommend putting the
controller on a private network segment. Failure to do so could, in high traffic cases, result in
communications lockout requiring the controller to be power-cycled.
Revision 6
21 April 2017
HC900 Process & Safety Controller User and Installation Manual 35