Omron SYSMAC CJ - REFERENCE MANUAL 08-2008

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Text String Processing Instructions Section 3-33
Description XCHG$(665) exchanges the text string designated by Ex1 with the text string
designated by Ex2. If either Ex1 or Ex2 is NUL, then two NUL characters
(0000 hex) will be output to the other one of them.
Note XCHG$(665) can be processed in the background. Refer to the SYSMAC CS/
CJ/NSJ Series PLC Programming Manual (W394) for details.
Flags
Precautions The maximum number of characters that can be designated by Ex1 or Ex2 is
4,095 (0FFF hex). If more than that are designated, an error will be generated
and the Error Flag will turn ON.
If the text string data designated by Ex1 and Ex2 overlaps, an error will be
generated and the Error Flag will turn ON.
Example In this example, XCHG$(665) is used to exchange two text strings.
Indirect DM/EM
addresses in binary
@ D00000 to @ D32767
@ E00000 to @ E32767
@ En_00000 to @ En_32767
(n = 0 to C)
Indirect DM/EM
addresses in BCD
*D00000 to *D32767
*E00000 to *E32767
*En_00000 to *En_32767
(n = 0 to C)
Constants ---
Data Registers ---
Index Registers ---
Indirect addressing
using Index Registers
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
Area Ex1 Ex2
Ex1
Ex2
Ex1
Ex2
Name Label Operation
Error Flag ER ON if more than 4,095 characters are designated by Ex1
or Ex2.
ON the Ex1 and Ex2 data overlap.
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.
OFF in all other cases.