Basic read/write
The mapping mechanisms are the same as for extended mapping, but without the
2 registers to map BA-Status-Flags, Priority and Reliability.
Example of a binary/multistate input object with basic read:
Input register address
Data item structure
X
Present value
Example of an analog/unsigned object with basic read:
Input register address
Data item structure
X
Present value
X+1
The address distribution is based on the following rule:
Command
Object type
Mapping
Address range
Read
Analog/Unsigned
Extend
3x0000~3x0999
Basic
3x1000~3x1999
Binary/Multistate
Extend
3x2000~3x2999
Basic
3x3000~3x3999
Read/write
Analog/Unsigned
Extend
4x0000~4x0999
Basic
4x1000~4x1999
Binary/Multistate
Extend
4x2000~4x2999
Basic
4x3000~4x3999
Read/write
Schedule
‑
4x6000~
Read/write
Device information ‑
4x9000~
Engineering of communicative devices
Modbus slave
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