KRAL BEM 100 - Modbus Communication; Supported Modbus Functions; Sequence of the Data Values; Legend for the Parameter Tables

5 Function description
5.2 Modbus communication
5.2 Modbus communication
5.2.1 Supported Modbus functions
Code Modbus function Register Application examples
03
Hex
READ HOLDING REGISTERS 4xxxx - Reading out of measured values, counter
statuses, average values
- Reading out of the device configuration
10
Hex
PRESET MULTIPLE REGISTERS 4xxxx - Device programming
Tab.8: Modbus functions
Note The maximum size of a data packet is 125 registers (words).
5.2.2 Sequence of the data values
Reg_H (Bit 15..0) Reg_L (Bit 31..16)
HByte LByte HByte LByte
1. 2. 3. 4.
Tab.9: Data type: 32-bit value
Reg_H (Bit 15..0) Reg_L (Bit 31..16) Reg_H (Bit 47..32) Reg_L (Bit 63..48)
HByte LByte HByte LByte HByte LByte HByte LByte
1. 2. 3. 4. 5. 6. 7. 8.
Tab.10: Data type: 64-bit value
5.2.3 Legend for the parameter tables
Address Start address of the data (=actual data address to be sent =register address minus 1)
Type Data type
o U = unsigned Integer (without sign)
o I = signed Integer (with sign)
o 16 / 32 / 64 bits
Length Number of words (16 bits = 1 word)
DEC Correction factor for value calculation because the Modbus data definition only allows
integer values.
o During reading of the Modbus addresses the response values received by the program
(HMI) are divided by DEC.
o During writing of the Modbus addresses the response values to be sent by the program
(HMI) are multiplied by DEC.
(DEC = 10
n
; n = Number of decimal places)
Tab.11: Legend
Note The numbering of the register addresses starts at1, the data addressing at0. This is how e.g. when
reading register1 the data address0 is used.
5.2.4 Protected parameters
These parameters are set in the works and cannot be changed by the user.
Name Description Address Type Length DEC
Serial_Number Manufacturer-specific ID 0x00 U32 2 10
0
Device_ID Serial number processing unit 0x02 U32 2 10
0
Boot_Count Number of device starts 0x04 U16 1 10
0
Hardware Version hardware 0x05 U16 1 10
2
Software Version software 0x06 U16 1 10
2
Total_Volume_1 Total value, cannot be reset [l] 0x08 I64 4 10
3
Operation_hours Number of operating hours 0x0C U16 1 10
0
Tab.12: Protected parameters
8
OIE 26en-GB Edition 2021-08
Operating instructions