4�8�2�- MODBUS PROTOCOL�
The
DHB-424
uses the RTU mode (Remote Terminal Unit) with its Modbus protocol.
The Modbus functions implemented in the unit are as follows:
Function
03
for reading multiple records.
Function
04
for reading input records.
Function
06
for writing one record.
Function
16
for writing multiple records
Function
17
for identifying the slave unit.
The maximum response time is 100 milliseconds.
4�8�3�- MODBUS MEMORY MAP�
Modbus addresses are in decimal format.
Table 6:Type of values in the Modbus memory MAP�
Address
Type of value
Description
4000-4049
integer (16 bits)
Value given in a 16-bit record.
7000-7039
float (32 bits)
Value given in two consecutive 16-bit records.
The records include the same data as the 32-bit records in the 7500
area.
Records valid for read function only.
7200-7326
float (32 bits)
Value given in two consecutive 16-bit records.
The records include the same data as the 32-bit records in the 7600
area.
The read and write functions are valid for the records.
7500-7519
float (32 bits)
Value given in a 32-bit record.
Records valid for read function only.
7600-7663
float (32 bits)
Value given in a 32-bit record.
The read and write functions are valid for the records.
4�8�3�1- Configuration: Input parameters menu
The Modbus address is in decimal format.
The read and write functions are enabled for all of these variables.
43
Instruction Manual
DHB-402 DHB-424
