Communication
2.3 Modbus communication
SIMOCODE pro - Communication
Function Manual, 11/2018, A5E40508495002A/RS-AC/003
105
Function code 16 - Write Multiple Registers
Function
This function enables the Modbus master system to write several registers from the
SIMOCODE pro register memory area.
A valid address from the register memory area is expected as the start address. The
selected addresses must be designated as writable (see the tables in Section Modbus RTU
data tables (Page 277), "Access" column).
Typical SIMOCODE parameters that can be written via Modbus RTU are the motor
protection parameters (e.g. rated motor current, trip class) and the warning and trip levels, as
well as delay times of the function blocks.
When writing several registers, they must be marked as a "writable" coherent block. A
register area that is interrupted by read-only registers cannot be written to as a block.
Slave
address
Function
code
Start address Number of
registers
Number of
bytes
Data CRC
1 byte 1 byte 2 bytes 2 bytes 2 bytes
The rated motor current of the SIMOCODE pro with slave address 16, stored as a double
word, is to be changed via Modbus. For this purpose, the new rated motor current of 10 A is
to be written to the device. The expected value is the rated motor current in units of 10 mA,
that is, 10 A = 10,000 mA =
x 10 mA =
x 10 mA.
Slave
Function code Start address Number of
Number of
Data CRC
0x10 0x10h 0x41A8 0x0002 0x04 0x0000
0x....
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