ABB COM600 series 5.0, Technical Reference Manual

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Supported transmission modes:
• Modbus RTU
•
Modbus ASCII
Table 2.4.4-1 The function codes supported by Modbus OPC Server
Memory area Description Function code
00001 - 09999 Read coil status 01
10001 - 19999 Read input status 02
40001 - 49999 Read holding register 03
30001 - 39999 Read input registers 04
00001 - 09999 Force single coil 05
40001 - 49999 Write single register 06
40001 - 49999 Write multiple registers 16
60001 - 65535 Write General Reference 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.
External OPC Server features 2.4.5.
OPC Data Access is used for continuous, real-time data communication between
PLC/DCS systems and COM600 communicating real-time data from data acquisition
devices such as PLCs to display and interface devices like Web Human-Machine Inter-
faces (WebHMI). OPC DA is also used for inter-process communication in COM600.
SNMP features 2.4.6.
The Simple Network Management Protocol (SNMP) is used to manage network con-
nectivity of substation devices in the substation LAN network.
The SNMP OPC Server is intended for providing methods for OPC clients to monitor
network-attached devices.
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1MRS758690
COM600 series 5.0
Master Protocols (Ethernet) and Applications Technical Refer-
ence Manual