HC900 Control System Architectures - HC900 controller Features
Revision 1.9 HC900 Process & Safety Controller Safety Manual 15
01/14
HC900 controller Features
Hardware
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Modular rack structure; components are ordered individually as needed
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CPU with Ethernet communications
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Easy to assemble, modify, and expand
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Local (C30S) and Remote input/output racks (C50S/C70S), private Ethernet-linked sub-network
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Parallel processing - a microprocessor in each I/O module performs signal processing, to preserve update
rates and proper failsafe action on loss of Controller updates.
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Power supplies - provide power to CPU rack and Scanner I/O rack
Redundancy (this will be available with the next release)
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Redundant C75S CPU
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Redundancy Switch Module (RSM) – required between redundant CPUs
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Redundant Power Supply – provides redundant power to any CPU rack or Scanner2 I/O rack
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Power Status Module (PSM) – required when using a second power supply in Scanner2 I/O rack
Communications
All CPUs (except where noted):
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Two galvanic isolated RS-485 serial ports.
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RS-485 port used for 2-wire link to HMI or field devices with port configuration as Modbus RTU master
or slave.
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Ethernet 10/100Base-T connection to: up to 5 PC hosts via Modbus/TCP protocol, Peer-to Peer
communication with other HC900 Controllers for process applications, and the Internet. C70S has 2
Ethernet ports for connection to up to 10 PC hosts. It also supports Modbus/TCP Initiator function over
both ports.
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Private Ethernet 100Base-T connection to I/O expansion racks (except C30S CPU)
Redundancy (this will be available with the next release)
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Supervisory Network – Ethernet 10/100 baseT to PC Applications (Designer & HC Utilities),
communicates to peer HC900 Controllers over Ethernet for process applications. C75S has two
Ethernet ports. Lead C75S CPU supports up to 10 concurrent sockets. It also supports Modbus/TCP
Initiator function over both ports.
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I/O Network – Direct connection to each C75 CPU.
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Device Network –Isolated RS-485 Serial Interface; Modbus RTU. Two serial ports available. Each port
can be set as Modbus Master or Slave. Host Serial Interface for Honeywell or third party operator
interface
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