NORD Drivesystems BU0050 - Manual (Page 64)

NORD USS and Modbus RTU Manual
64 Subject to technical amendments BU 0050 GB-3111
2.5.3 0Fh Write Multiple Coils
Via this access, all of the 8 writable coils can be switched simultaneously.
Master

Slave Slave

Master
Function Code 1 Byte 0x0F Function Code 1 Byte 0x0F
Start address 2 Byte 0x0000 to 0x0007 Start address 2 Byte 0x0000 to 0x0007
Number of Coils 2 Byte 0x0001 to 0x0008 Number of Coils 2 Byte 0x0001 to 0x0008
Number of bytes 1 Byte 1
Example:
Bus IN Bits 2, 4 and 5 are set from start address 0x0001.
Query (Master

Slave) Response (Slave

Master)
Address 0x08 Address 0x08
Function Code 0x0F Function Code 0x0F
Start address High 0x00 Start address High 0x00
Start address Low 0x01 Start address Low 0x01
Number of High Coils 0x00 Number of High Coils 0x00
Number of Low Coils 0x04 Number of Low Coils 0x04
Number of bytes 0x01 CRC High 0x05
Coil value 0x0D CRC Low 0x51
CRC High 0x02
CRC Low 0xF9