Fuji Electric FRENIC-VG Series, User Manual

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5.2.6 Field descriptions
5.2.6.1 Data field
8 9 10 11 12
SP additional data 1
st
character 2
nd
character 3
rd
character 4
th
character
5 6 7 8
1
st
character 2
nd
character 3
rd
character 4
th
character
Except for some special cases, the length of all data is 16 bits. In the data field of a transmission
frame, the data format is hexadecimal (0000H-FFFFH), and each digit is expressed as an ASCII
code. Additionally, for negative integer data (signed data), two’s complement is used to represent the
negative data.
Notes: ・ Use alphabetical capitals for hexadecimal A-F.
・
For polling, set all request frame data fields to zero (‘0’) before sending.
・
For selecting, ACK response frame data field contents are not specified.
Example: Function code S01 (speed setting 1): 500 r/min (Max. speed: 1500 r/min)
1) Calculate the default in accordance with the S01 data format (±20,000/max. speed).
Data = 500r/min × ±20,000/1500r/min (CW: +, CCW: -)
= ±6666.6
≈ ±6667
2) Convert the data to hexadecimal. (negative data: two’s complement)
Data = 6667 (CW)
= 1A0BH
Data = -6667 (CCW)
= 0 - 6667 = 65536 - 6667 = 58869
= E5F5H
3) Set the data.
Position Default (CW) Default (CCW)
1
st
character ASCII ‘1’ ASCII ‘E’
2
nd
character ASCII ‘A’ ASCII ‘5’
3
rd
character ASCII ‘0’ ASCII ‘F’
4
th
character ASCII ‘B’ ASCII ‘5’
Standard frame
Option frame