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COM600 series, Version 4.1
Modbus TCP Master (OPC) User's Manual
A system using Modbus TCP/IP can include different types of devices. There can be
ModbusTCP/IP client and server devices connected to an TCP/IP network. There can
also be devices such as bridges, routers and gateways for connections between the TCP/IP
network and a serial line sub-network, permitting connections to Modbus serial line client
and server end devices.
The Modbus OPC Server supports the following features:
•
OPC Data Access v. 1.0/2.0
•
OPC Alarms and Events specifications v. 1.10
•
IEC 61850 data modeling
•
System supervision:
•
Modbus channel communication
•
Modbus device communication
Supported transmission modes:
•
Modbus RTU
•
Modbus ASCII
Table 2.3-1 The function codes supported by Modbus OPC Server
Function code
01
02
03
04
05
06
16
21
The following data formats are supported:
•
Bit, one coil, or input status
•
Word, one register in IED's memory. The data is used in an unsigned form
•
Integer, one register in IED's memory. The MSB bit is used as a sign bit
•
Long MSW last, signed 32-bit object, which needs two registers from IED's memory
in lsw-msw order
•
Long MSW first, signed 32-bit object which needs two registers from IED's memory
in msw-lsw order.
•
Float MSW last, floating point type which needs two input registers from IED's
memory in lsw-msw order
•
Float MSW first, floating point type which needs two input registers from IED's
memory in msw-lsw order.
Description
Read coil status
Read input status
Read holding register
Read input registers
Force single coil
Write single register
Write multiple registers
Write General Reference
1MRS756445
Memory area
00001 - 09999
10001 - 19999
40001 - 49999
30001 - 39999
00001 - 09999
40001 - 49999
40001 - 49999
60001 - 65535
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