Introduction - Feature Summary
10 HC900 Process Controller Installation and User Guide Revision 19
06/14
Redundant Networks for Host communications - Redundant Networks for Host communications are provided on
the C75 CPU. Both network ports are continuously active on the Lead controller. The network ports on the Reserve
CPU are not available for external communications. Experion HS and the 900 Control Station (15 inch model)
support redundant Ethernet communications and automatically transfer communications during a network failure.
Scanner 2 module – has 2 ports, one for each CPU connection to I/O.
Feature Summary
Hardware
• Modular rack structure; components are ordered individually as needed
• CPU with Ethernet communications
• Easy to assemble, modify, and expand
• Local (C30 and C30S) and Remote input/output racks (C50/C70), private Ethernet-linked sub-network
• Parallel processing - a microprocessor in each I/O module performs signal processing, to preserve update
rates
• Power supplies - provide power to CPU rack and Scanner I/O rack
Redundancy
• Redundant C75 CPU
• Redundancy Switch Module (RSM) – required between redundant CPUs
• Redundant Power Supply – provides redundant power to any CPU rack or Scanner2 I/O rack
• Power Status Module (PSM) – required when using a second power supply in Scanner2 I/O rack
Communications
All CPUs (except where noted):
• Serial ports
− In legacy systems, two serial ports, RS-232 or RS-485 can be configured.
− In new systems, two RS-485 ports can be configured.
• PC Configuration Tool
− In legacy systems, RS-232 port used for link to PC configuration tool (up to 50 feet or 12.7 meters) or
modem. Port configurable as Modbus RTU/TCP master or slave.
− In new systems RS-232 to RS-485 cable is used for link to PC configuration tool.
• Link to Operator Interface
− For legacy and new systems, RS-485 port used for 2-wire link to the Operator Interface (up to 2000
feet or 601meters). Port configurable as Modbus RTU master or slave.
• Ethernet 10/100Base-T connection to: up to 5 PC hosts via Modbus/TCP protocol, Peer-to Peer
communication with other HC900 Controllers, and the Internet. C70 has 2 Ethernet ports for connection
to up to 10 PC hosts. It also supports Modbus/TCP Initiator function over both ports.
• Private Ethernet 100Base-T connection to I/O expansion racks (except C30 and C30S CPU)
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