Circutor CEM-M-ETH Instrukcja Użytkownika Pobierz pdf (Strona 13)

Table 5 shows the format of the MODBUS/TCP frame.

Table 5: MODBUS/TCP frame format

Name Length Function

Transaction identier 2 For message synchronisation between the server and client.

Protocol identier 2 Value 0 for MODBUS/TCP

Field length 2 Number of bytes remaining in the frame

Unit identier 1 Peripheral number

Function code 1 Modbus function number

Data bytes n Response or command data

The MODBUS functions implemented in the unit are:

Functions 03 and 04. Reading of logs.

Function 10. Writing of multiple logs.

4�4�2�- VARIABLES MODBUS

All MODBUS map addresses are hexadecimal.

4�4�2�1�- Conguration variables

The Read and Write functions are implemented for these variables.

Table 6:Modbus conguration variables CEM M-RS485.

Description Address Size Valid data range

Default

value

Impulse output type 0x0080 16 bits 0: Active energy, 1: Reactive energy 0

Impulse output weight 0x0081 16 bits Wh/impulse 0 ... 99999 -

Cost per kWh 0x00B0 32 bits

0.0000 ... 9999.9999 with 4 decimal places

of resolution

KgCO

0x00B2 32 bits

0.0000 ... 9.0000 with 4 decimal places of

resolution

Note: Some MODBUS variables may not be available depending on the CEM energy meter

coupled to the CEM M-ETH. See “4.4.2.7.- Available addresses by unit”

Instruction Manual

CEM M-ETH

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 23 24

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