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HC900 Process & Safety Controller User and Installation Manual
Revision 6
21 April 2017
Communications
C30
C50
C70
C75
Network Communications
Ports
Number of Ethernet
10/100Base-T connections
1
1
2
2
Ethernet 10/100Base-T,
RJ-45 connection
ATTENTION
Safety Applications require
a properly configured
firewall device
Supports Modbus/TCP Protocol to PC
supervisory and data acquisition software
packages, OPC server, Modbus/TCP
Initiator, Peer to Peer, and Designer
Software configuration software
Supports redundant Modbus/TCP
Protocol to PC supervisory and data
acquisition software packages, OPC
server, Modbus/TCP Initiator (non-
redundant), Peer to Peer, and Designer
Software configuration software
Max. number of concurrent
Ethernet host connections
Up to 5 (peer data
exchange does not
consume a host
connection)
Up to 10 shared between two ports (peer data exchange does
not consume a host connection).
RS-232 Port
Ports per controller
RS-485 with Modbus RTU or Honeywell protocol. 3-Plug connectors supplied.
Baud rates
1200, 2400, 4800, 9600, 19.2K, 38.4K, 57.6 K, 115.2K configured by Designer
software or OI.
Modem
For remote connection to Designer software, requires external modem at controller,
1200 baud to 57.6KB
Galvanically Isolated
RS-
485 Ports
Ports per controller
Two, (connector supplied), Honeywell or Modbus RTU protocol. Only one port for
1042/ 559 operator interface support.
Cable type
2-wire plus shield, Belden 9271 or equivalent
1042, 559 Distance from
controller
2000 ft. (600 m.)
1042, 559 Power to OI
24VDC, user-provided at OI
Unit addresses
1 to 247
Galvanically Isolated
RS-
485 Ports
Parity (user selectable)
Odd, even, none
Stop bits (user selectable)
1 or 2
Speed (user selectable)
1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200
Double Register Format for
Modbus RTU Slave and
Master data (User selectable)
Selectable byte order
RS-485 Modbus, Slave
Operation
Number of ports per controller
Up to two
Masters per port
One
Principal Function Block
Address Range
User selectable starting address range for registers assigned to each principal block
type.
RS-485 Modbus Master
Operation
Number of ports per controller
One RS485
Function Block Types
Slave
– 4 read and 4 write data points
Read (Slave extension block ) up to 16 parameters
Write (Slave extension) up to 8 parameters
(No limit on the number of Read and Write extension blocks per Slave block up to the
maximum 1024 parameters per controller.)
Slave devices per controller
Up to 32
Number of read/write Modbus
Parameters
Up to 1024 max. per controller
Double Register Format
Selectable per device
Speed
1 second fastest
– load dependent
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