PRON NA60-MB0
Version 3.50
PRON NA60-MB0 Remote Setting Manual
Page: 13 of 59
3.1.4 DIM
The DIM field is the number of Modbus registers necessary to contain the VAR data.
Example: let’s read the value of the variable “Relay phase nominal current - In ”.
From the previous table we see that the reference is 4x for which the function 0x03 has to be used for reading.
The Modbus address is IDX-1=50-1=49.
The request for reading is the following:
01 03 00 31 00 01 - -
TX
S F ADR DIM CRC
3.1.5 TYPE
The TYPE field specifies the basic data type associated with VAR, as described in chapter 2.1.
3.1.6 UM
The UM field specifies the Unit of Measure of the variable.
If UM is empty, it means that the Unit is just a number.
3.1.7 Kv
The Kv field contains the scale factor that has to be applied to the variable to obtain the real value. If Kv is not
equal to 1, the value of the variable must be divided by Kv.
Example: let’s consider the following address data table
VAR REF IDX DIM TYPE UM KV ENUM
Phase current IL1 - Value 3x 159
2 LONG
In 16000
Let’s read the “Phase current IL1 - Value “ from the Slave address 1.
01 04 00 9E 00 02 - -
TX
S F ADR DIM CRC
Let’s assume the following response:
01 04 04 A9 80 00 03 - -
RX
S F B DATA1 DATA2 CRC
LONG
VAL
L
VAL
H
The TYPE field is necessary to decode the right value returned from the Modbus response, as described in chapter
2.1. The decoded value contained in the response is 0x0003A980 = 240000. Kv=16000 means that the value of the
variable has to be divided by 16000. UM specify the Unit. The “Phase current IL1 – Value” is equal to 15 In.
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