Fcs - Omron SYSMAC CP Series Instruction & Reference Manual

FCS

Instruction
FRAME CHECKSUM
Symbol
Applicable Program Areas
Area Step program areas
Usage OK
Operands
Operand
C First control word
R1 First word in range
D First destination word
C: First control word
15
C
W: Number of words/bytes in range
15 14 13 12 11
C+1
00 0000 0000
Starting byte (Valid only when bit 13 is 1.)
0: Leftmost byte
1: Rightmost byte
Calculation units
0: Words
1: Bytes
0
Operand Specifications
Word addresses
Area
CIO WR HR
C
OK OK OK
R1, D
Flags
Name
Error Flag
CP1E CPU Unit Instructions Reference Manual(W483)
Mnemonic Variations
FCS @FCS
Description
0
&1 to &65535 (decimal) or
#0001 to #FFFF (hex)
0
0000
0
AR T C DM
OK OK OK OK
Label
P_ER • ON if the content of C is not within the specified range of 0001 through FFFF.
• OFF in all other cases.
Function
code
Calculates the FCS value for the specified range
180
and outputs the result in ASCII.
FCS
FCS(180)
C: First control word
C
R1: First word in range
R1
D D: First destination word
Subroutines
OK
Data type
UDINT
UINT
UINT
R1: First word in range
15
R1
to
R1+(W–1)
D: First destination word
When bytes are specified as the operation units:
15
D
When words are specified as the operation units:
15
D+1
The leftmost four digits are stored in D+1 and the rightmost
four digits are stored in D.
Note C and C+1, all of the words in the calculation range
must be in the same data area.
Indirect DM addresses
Constants
@DM *DM
OK
OK OK
---
Operation
2 Instructions
Function
Interrupt tasks
OK
Size
2
Variable
Variable
0
Calculation range
to
0
0 15
D
CF Pulse bits TR bits
--- --- ---
2-255
2
0