Control Techniques Modbus RTU, Руководство пользователя

Страница: 7 / 12

Modbus RTU Module LEDs
7 LEDs
The Network Status LED (1) indicates the state of the communications link between the
module and the network. LED operation is as follows:
03193.
C
1
1
Off Soft starter not powered up
On Communication active
Flashing Communication inactive
NOTE
If communication is inactive, the soft starter may trip if the Communications
Timeout function has been set on the module. When communication is restored,
the soft starter will require a Reset.
8 Operation
8.1 Modbus functions
The Modbus Module supports the following Modbus functions:
• 03 Read multiple registers 40003 to 40008
• 06 Write single register 40002
Modbus broadcast functions are not supported.
8.2 Modbus Error Codes
Code Description Example
01 Illegal function code Function other than 03 or 06
02 Illegal data address Register number invalid
03 Not readable data Register not allowed for data reading
04 Not writable data Register not allowed for data writing
05 Data boundary fault Multiple data transfer across data boundary or data size
more than 125
06 Invalid command
code
eg writing "6" into 40003
10 Local communication
error
Communication error between Modbus slave and
starter
NOTE
Some of the above codes are different from those defined in the Modbus
Application Protocol Specification available on www.modbus.org.
User Manual 5