Omron SYSMAC CJ - REFERENCE MANUAL 08-2008 Reference Manual page 333

Comparison Instructions
Description
Area
Index Registers IR0 to IR15 (for unsigned data only)
Indirect addressing ,IR0 to ,IR15
using Index Registers
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
The input comparison instruction compares S
values and creates an ON execution condition when the comparison condition
is true. Unlike instructions such as CMP(020) and CMPL(060), the result of an
input comparison instruction is reflected directly as an execution condition, so
it is not necessary to access the result of the comparison through an Arith-
metic Flag and the program is simpler and faster.
Inputting the Instructions
The input comparison instructions are treated just like the LD, AND, and OR
instructions to control the execution of subsequent instructions.
Input type
LD The instruction can be connected directly to the left bus bar.
AND The instruction cannot be connected directly to the left bus bar.
OR The instruction can be connected directly to the left bus bar.
LD connection
<
AND connection
OR connection
<
Options
The input comparison instructions can compare signed or unsigned data and
they can compare one-word or double values. If no options are specified, the
S
1
and S
1
Operation
ON execution condition when
comparison result is true.
ON execution condition when
comparison result is true.
<
ON execution condition when
comparison result is true.
Section 3-7
S
2
as signed or unsigned
2
293