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7 APPLICATION INSTRUCTION
7.16 Check code
7.16 Check code
Check code
CCD(P)
These instructions calculate the horizontal parity value and sum check value in the error check methods used in
communication. There is another check method, called CRC (cyclic redundancy check). For obtaining CRC value, use the
CRC(P) instructions.
■Descriptions, ranges, and data types
■Applicable devices
*1 T, ST, C cannot be used.
Ladder diagram Structured text
ENO:=CCD(EN,s,n,d);
ENO:=CCDP(EN,s,n,d);
Operand Description Range Data type Data type (label)
(s) Head device number of applicable device 16-bit signed binary ANY16
(d) Head device number storing the calculated data 16-bit signed binary ANY16
(n) Number of data 1 to 32767 16-bit signed binary ANY16
Operand Bit Word Double word Indirect
specification
Constant Others
X, Y, M, L,
SM, F, B, SB
U\G T, ST,
C, LC
T, ST, C, D,
W, SD, SW, R
U\G Z LC LZ K, H E $
(s)
*1
(d)
*1
(n)
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