4. Configuration
105
Data Start Address: initial address of the MODBUS mapping data.
Data Size: the size value specifies the maximum amount of data that a MODBUS relation can
access, from the initial address. Thus, to read a continuous address range, it is necessary that all
addresses are declared in a single interface. This field varies with the MODBUS data type
configured.
Data Range: this field shows to the user the memory address range used by the MODBUS relation.
Requests Configuration – Configuration via Symbolic Mapping
The setting of the MODBUS requests, displayed in Figure 4-32, follows the parameters described in
Table 4-71:
Figure 4-32. MODBUS Data Request Screen
01– Read Coils
02– Read Input Status
03– Read Holding Registers
04– Read Input Registers
05– Write Coil
06– Write Register
15– Write multiple Coils
16 – Write Multiple Registers
22– Masked Writing of Register
23 –Read/Write Multiple Register
Period of communication (ms)
Initial address of the
MODBUS read data
Depends on the function used
MODBUS read data address
range
Initial address of the
MODBUS write data
Depends on the function used
MODBUS write data address
range
Name of a variable declared in a program
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General