Omron CP - PROGRAMMING MANUAL 05-2007 Programming Manual page 632

Table Data Processing Instructions
Description
Flags
Area
Indirect DM addresses
in binary
Indirect DM addresses
in BCD
Constants
Data Registers
Index Registers
Indirect addressing
using Index Registers
FCS(180) calculates the FCS value for C 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).
R1
C (Table length)
ASCII conversion
Calculation
FCS value
Name Label
Error Flag ER
C
@ D0 to @ D32767
*D0 to *D32767
Specified values ---
only
---
---
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
Operation
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 com-
munications port number specified as the Com Port num-
ber for Background Execution is OFF when background
processing is specified (CP1H only).
OFF in all other cases.
Section 3-16
R1 D
599