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Chapter 7 Communication function
B) For command type of array
Forma
t
Header
Name
Frame
Ex.)
ACK
Station
Com
No.
mand
H10
R(r)
Comman
d
type(##)
H17
Number
Number of
of blocks
data(**)
H01
H14
Data
H23A0112233445566778899
AABBCCDDEEFF001122
Frame
Tail
check
ETX
BCC
H3233413031313232333334
ASCII
H06
value
H313
H52
0
(72)
H3137
H3031
H3134
343535363637373838393941
414242434344444545464630
03
3031313232
Remark
[Note 1] If response format from PLC when data type of array variable is WORD and variable’s name and element
number is ‘OUTPUT_ARR[0]~[9]’ is as above, the number of data is the element number data*2 = 20( H14 )
Bytes.
ü
Station number, commands, type of command, and number of blocks are the same as in computer request format.
ü
BCC : When command is one of lower case(r), only one lower byte of the value resulted by adding 1 byte each
to ASCII values from ACK to ETX is converted into ASCII, added to BCC, and sent.
ü
Number of data means Byte number of HEX. type and is converted into ASCII. This number is determined
according to command type, ## of computer request format.
[Table7.19] Number of data according to variable data type
Data type
Command
type(##)
Data number(**)
Data type
Command type
Number of
(##)
data(**)
BIT
H00
1
UDINT
H0B
4
BYTE
H01
1
ULINT
H0C
8
WORD
H02
2
REAL
H0D
4
DWORD
H03
4
LREAL
H0E
8
LWORD
H04
8
TIME
H0F
8
SINT
H05
1
DATE
H10
8
INT
H06
2
TOD
H11
8
DINT
H07
4
DT
H12
8
LINT
H08
8
STRING
H13
10
USINT
H09
1
BLOCK
H14
Max. 60 Bytes
UINT
H0A
2
ARRAY
H15-H27
Max. 60 Bytes
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