The HC900-expansion I/O link is a private network and the switch used for the interconnection of the

HC900 Processor and Scanners must not be connected to any other LAN or WAN.  Likewise, no devices

other than the HC900 components should be connected to the I/O link Switch.  Failure to comply will

cause communication failures on the I/O link causing I/O modules to go in and out of their failsafe

settings.

Note: The HC900 is equipped with an Ethernet port as a standard feature (two Ethernet ports on the C70

& C75 CPU). These ports can function simultaneously as slave and master communications ports.

The dual Ethernet ports (C70 & C75 CPU’s) can be configured for redundant operation to a host.

If the host device does not have the inherent capability to recognize a network failover, the

Honeywell HWIOPC Server would be used to perform this functionality.

The dual Ethernet ports will not operate in a redundant configuration through a gateway to a

Host / server on another subnet. While both the E1 & E2 Ethernet can be configured with a default

Gateway address, only the E1 port will actually communicate across a gateway to another subnet

Hardware Components

This section contains general descriptions of each of the major components of the HC900 system.

For environmental specifications, refer to the section on Pre-Installation Planning.

HC900 Controller Rack

An HC900 Controller (“local rack”) is shown in the following figure. As indicated in this figure, the Controller Rack

includes:

1.  Rack, available in 4- 8-, or 12-slot versions

2.  Power Supply

3.  Controller Module

4.  Grounding bars (for I/O wiring; optional)

5.  Input/Output modules.

6.  I/O Terminal Blocks

HC900 Redundant Controller Rack

A HC900 Redundant Controller is shown in the following figure.

Rack

Redundancy Switch Module (RSM) . Interface between Lead/Reserve controllers.

Lead/Reserve controllers. Two C75 CPUs, designated “CPU-A” (left), “CPU-B” (right).

Two 900P01-xxxx or 900P02-xxxx Power Supplies

I/O Expansion Rack

I/O expansion (“remote”) racks, shown in Figure 8. are available to accommodate additional input/output modules,

and/or to enable location of I/O modules close to the process and remote from the controller. For C75/C75S, all I/O

is in a rack or racks separate from the controller rack.

Scanner type must match controller type. i.e. example S50S may only be used with C50S, or C70S.  S50S cannot be

used with a C50 or C70.

An I/O expansion rack includes:

1. Rack, available in 4- 8-, or 12-slot versions

2. Power Supply

3. Scanner 1 Module (S50/S50S) (shown) or Scanner 2 Module (S75/S75S)

4. Grounding bars (for I/O wiring; optional; required for

safety applications)

5. Input/Output modules

6. I/O Terminal Blocks

7. Power Status Module (PSM)

(req’d if using Reserve Power Supply)

8. Reserve Power Supply (optional). Available in 8- or 12

slot racks.