Control Techniques Modbus RTU - Leds; Operation

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