Circutor AFQm Series, Instruction Manual

Page: 73 / 108

73 Instruction Manual
AFQm
8.2.- PROTOCOL
In the Modbus protocol, the
AFQm
uses the RTU (Remote Terminal Unit) mode.
The Modbus functions implemented in the device are as follows:
Functions 03 and 04 . Reading of n Words (2 bytes).
8�2�1�- EXAMPLE OF MODBUS QUERY
Query: Value of the Load current of L1
Address Function
Initial
register
No� of
registers
CRC
0 A 03 92 0002 xxxx
Address: 0A , Peripheral number: 10 in decimal.
Function: 03 , Read function.
Initial Register: 92 , register from which to start reading.
No� of registers: 0002 , number of registers to be read.
CRC: xxxx , CRC character.
Response:
Address Function
No� of
Bytes
Register
no� 1
Register
no� 2
CRC
0 A 03 04 0000 00FA xxxx
Address: 0A , Responding peripheral number: 10 in decimal.
Function: 03
, Read function.
No� of bytes: 04 , No. of bytes received.
Register: 000000FA , value of load current L1, with 1 decimal: 0xFA = 25.0 A
CRC: xxxx
, CRC character.
8�2�2�- MODBUS MAP
All Modbus map variables are in hexadecimal format.
For these variables, Functions 03 and 04 are implemented.
8�2�2�1�- Load Measurements
Table 23:Modbus memory map: Measurements with Load (Table 1)�
Parameter L1 L2 L3 LN Units
Current with Load 93 - 92 95 - 94 97 - 96 99 - 98 [Hi] + [Low] A with 1 decimal
Active power with Load AD - AE AF - B0 B1 - B2 - kW with 2 decimal places and sign.
Reactive power with Load B3 - B4 B5 - B6 B7 - B8 - kVar with 2 decimal places and sign.
Apparent power with Load B9 - BA BB - BC BD - BE - kVA with 2 decimal places and sign.
cos ɸ with Load D1 D2 D3 - With 3 decimal
Current THD with Load 8C 8D 8E - % with 1 decimal