Omron CJ - INSTRUCTIONS REFERENCE MANUAL 07-2009 Reference Manual page 638

Flags
Name
Error Flag
Function
FCS(180) calculates the FCS value for W units
of data beginning with the data in R1, converts
the value to ASCII code, and outputs the result
to D (for bytes) or D+1 and D (for words). The
settings in C+1 determine whether the units
are words or bytes, whether the data is binary
(signed or unsigned) or BCD, and whether to
start with the right or left byte of R1 if bytes are
being added.
When bit 13 of C+1 has been set to 1,
FCS(180) operates on bytes of data. In this
case, bit 12 determines whether the calculation
starts with the rightmost byte of R1 (bit 12 = 1)
or the leftmost byte of R1 (bit 12 = 0).
Hint
FCS(180) can be processed in the background. Refer to the SYSMAC CS/CJ/NSJ Series PLC
Programming Manual (W394) or the CJ2 CPU Unit Software Operation Manual (W473) for details.
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Label
ER • ON if the content of C is not within the specified range of 0001 through FFFF.
• ON if the Communications Port Enabled Flag for the communications port number specified as the
Com Port number for Background Execution is OFF when background processing is specified.
• OFF in all other cases.
Operation
R1
W (Table length)
ASCII conversion
Calculation
FCS value
3. Instructions
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