File: UT-5601
Copyright © - OBL Metering pumps - All rights reserved
32
Modbus commands registers
Da 41001 a 41016
Registers that can be read with 1 command
58
Registers that can be written with 1
command
58
Function Codes
03 ( 03 hex )
–
read holding register
16 ( 10 hex )
–
preset multiple holding register
Exclusion Codes
01 ( 01 hex )
–
illegal function
02 ( 02 hex )
–
illegal data value
03 ( 03 hex )
–
illegal data address
07 ( 07 hex )
–
NAK
The user can activate MODBUS functionality in settings menu.
Figure 17 Modbus settings
In MODBUS window, the user can:
1. activate MODBUS (YES/NO)
2. set the baud rate (2400-4800-9600-19200-38400-57600-115200 bps ).
3. set the slave device address
When MODBUS is active, the user can locally do the following operations:
1. When the motor is ON
a. To stop the pump (selecting STOP icon)
b. To display statistics
2. When the motor is OFF:
a. To navigate in the menu
b. It is not possible to start up the motor. The user has to turn off MODBUS mode to
start up the motor.
When MODBUS is active, an icon will appear on the right corner of all windows of the firmware.
Figure 18 Modbus opertating mode
COMMUNICATION EXAMPLE
Black Line PRO can communicate with a PLC using MODBUS interface.
Examples of communications are described hereinafter:
1. Read Holding Registers (Function Code 03)
a. Request:
