Frame Length Calculation - Fuji Electric FRENIC-AQUA series User Manual

N PROCESS
38 CRC = No.37 Xor GP
39 Shift > 1
40 CRC = No.39 Xor GP
41 Shift > 2
42 CRC = No.41 Xor GP
43 Shift > 1
44 CRC = No.43 Xor GP
th
45 5 data byte
46 CRC = No.44 Xor No.45
47 Shift > 5
48 CRC = No.47 Xor GP
49 Shift > 2
50 CRC = No.49 Xor GP
51 Shift > 1
52 CRC = No.51 Xor GP
th
53 6 data byte
54 CRC = No.52 Xor No.53
55 Shift > 3
56 CRC = No.55 Xor GP
57 Shift > 2
58 CRC = No.57 Xor GP
59 Shift > 2
60 CRC = No.59 Xor GP
61 Shift > 1
(shift of No. 8 terminated)
Transmitted CRC data
From the above calculation, the transmitted data is as shown below:
Station
'FC'
address
01 03
H H
3.4.4

Frame length calculation

To calculate CRC-16, it is necessary to know the length of variable length messages. The
length of all types of messages can be determined according to Table 3.14 Lengths of response
messages.
'FC'
1 Read coil status
3 Read holding registers
5 Force single coil
6 Preset single register
8 Diagnostics
15 Force multiple coils
16 Preset multiple registers
128 to 255 Exception function
th rd th
*1 7 , 3 : The 7 and 3
Table 3.13 CRC data calculation table (Continued)
15 14 13 12 11 10
1 1 0 1 0 1
0 1 1 0 1 0
1 1 0 0 1 0
0 0 1 1 0 0
1 0 0 1 0 0
0 1 0 0 1 0
1 1 1 0 1 0
0 0 0 0 0 0
1 1 1 0 1 0
0 0 0 0 0 1
1 0 1 0 0 1
0 0 1 0 1 0
1 0 0 0 1 0
0 1 0 0 0 1
1 1 1 0 0 1
0 0 0 0 0 0
1 1 1 0 0 1
0 0 0 1 1 1
1 0 1 1 1 1
0 0 1 0 1 1
1 0 0 0 1 1
0 0 1 0 0 0
1 0 0 0 0 0
0 1 0 0 0 0
4
Function code
03 02
H H
Table 3.14 Length of response messages
Description Query/Broadcast message
length (except CRC code)
6 bytes
6 bytes
6 bytes
6 bytes
6 bytes
7 + (7
7 + (7
Unused
rd
byte count values stored in the frame.
3-23
9 8 7 6 5 4
1 1 0 0 0 1
1 1 1 0 0 0
1 1 1 0 0 0
1 0 1 1 1 0
1 0 1 1 1 0
0 1 0 1 1 1
0 1 0 1 1 1
0 0 0 0 0 0
0 1 0 1 1 1
1 1 0 1 0 0
1 1 0 1 0 0
0 1 1 1 0 1
0 1 1 1 0 1
0 0 1 1 1 0
0 0 1 1 1 0
0 0 0 0 0 1
0 0 1 1 1 1
0 0 1 0 0 1
0 0 1 0 0 1
1 1 0 0 1 0
1 1 0 0 1 0
1 1 1 1 0 0
1 1 1 1 0 0
0 1 1 1 1 0
1 E
Number of read
CRC check
data
00 14 E4
H H
th
) bytes *1
th
) bytes *1
3.4 CRC-16
3 2 1 0 Flag
0 1 1 1
1 0 1 1 1
1 0 1 0
0 0 1 0 1
0 0 1 1
0 0 0 1 1
0 0 0 0
0 0 0 0
0 0 0 0
1 0 1 1 1
1 0 1 0
0 0 1 0 1
0 0 1 1
1 0 0 1 1
1 0 0 0
0 1 0 0
1 1 0 0
1 1 1 1 1
1 1 1 0
0 1 1 1 1
0 1 1 0
1 0 0 1 1
1 0 0 0
0 1 0 0 0
4
41
H H
Length of response
message
(except CRC code)
rd
3 + (3 ) bytes *1
rd
3 + (3 ) bytes *1
6 bytes
6 bytes
6 bytes
6 bytes
6 bytes
3 bytes