2 - 2 VM600 networking manual MAVM600-NET/E
Edition 9 - February 2018
CPUM cards running firmware version 074 or earlier
CPUM CARD DIRECTORY STRUCTURE AND CONFIGURATION FILES
2.2 CPUM cards running firmware version 074 or earlier
Refer to the VM600 networking manual, edition 6 (or earlier), for information on the directory
structure and configuration files for CPUM cards running firmware version 074 or earlier.
2.3 Modbus configuration files
It is sometimes necessary to change the Modbus address of a rack or various
communications parameters such as baud rate or parity. This is done by editing the
Modbus-related configuration files stored on the CPUM.
The configuration files to edit depend on the implementation of the Modbus software
interface, which depends on the version of firmware running on the CPUM card.
2.3.1 CPUM cards running firmware version 071 or later
For CPUM cards running firmware version 071 or later, the Modbus server is more flexible
and completely configurable by a single file. This configuration file is listed in Table 2-2 and
is stored on the CPUM.
NOTE: For CPUM cards running firmware version 071 or later, only the single
configuration file listed in Table 2-2 must be modified to change communications
parameters. The configuration file to edit is the same for all communications
interfaces.
The communication parameters are defined in the top sections of the modbusDefault.cfg
configuration file, labelled [RTUx], [TCP] and [GLOBAL]. See Figure 2-1 and 9.2 Definition of
registers for additional information.
NOTE: For compatibility with existing equipment, the default Modbus configuration file
supplied with all delivered systems is set up to support the same behaviour as
existing CPUM cards (that is, CPUM cards running firmware version 067 or
earlier).
Table 2-2: Modbus configuration file for CPUM cards
running firmware version 071 or later
Modbus
configuration file
Description
modbusDefault.cfg
The configuration file for Modbus communications and
PROFINET communications (version 081 or later)
Note: The directory structure (location) for the Modbus configuration files on the CPUM card is:
etc/cpum/mbsrv/modbusDefault.cfg
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