9 Communication
9.2 Modbus
154
SICAM MMU 7KG9663, Device Manual
E50417-H1040-C514-A3, Edition 01.2016
9.2.5
Register Assignment
Only holding registers are used for SICAM MMU. All measured values, indications and metered values are
stored in these holding registers.
Each Modbus register set has an individual 6-digit identification number.
The holding register set has the identification number 4xxxxx and begins with the register number "1" (400001).
9.2.6
Data Types
The following data types are used for storing variables in the Modbus registers.
•
Measured value
•
Date/time
•
Indication (read only)
•
Controllable indications (read and write)
•
Counter
NOTE
The following descriptions only quote the last 4 digits of the holding register numbers, for example
0052
for
400052.
NOTE
The following convention applies when storing variables to the Modbus holding register that consist of more
complex data types (that is variables that are larger than a holding register, for example 32-bit measured val-
ues):
The register with the lowest address contains the most significant byte (MSB), the register with the highest
address contains the least significant byte (LSB).
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