Omron SYSMAC CJ - REFERENCE MANUAL 08-2008 Reference Manual page 464

Increment/Decrement Instructions
Flags
Precautions
Examples
@ − −BL
424
of the specified words is decremented only when the execution condition has
gone from OFF to ON.
Wd+1
The Equals Flag will be turned ON if the result is 0000 0000 and the Carry
Flag will be turned ON when a digit changes from 0 to 9.
Name Label
Error Flag ER
Equals Flag =
Carry Flag CY
The content of Wd+1 and Wd must be BCD. If it is not BCD, an error will occur
and the Error Flag will be turned ON.
Operation of – –BL(597)
In the following example, the 8-digit BCD content of D00101 and D00100 will
be decremented by 1 every cycle as long as CIO 000000 is ON.
Wd+1: D00101 Wd:
Decrement Decrement Decrement Decrement
Operation of @– –BL(597)
The up-differentiated variation is used in the following example, so the BCD
content of D00101 and D00100 will be decremented by 1 only when
CIO 000000 has gone from OFF to ON.
Wd+1: D00101
Wd Wd+1
Operation
ON if the content of Wd+1 and Wd is not BCD.
OFF in all other cases.
ON if the result is 0000 0000 after execution.
OFF in all other cases.
ON if a digit in Wd+1 or Wd went from 0 to 9 during exe-
cution.
OFF in all other cases.
Decremented every cycle
while CIO 000000 is ON.
D00100 Wd+1: D00101
1
: Execution of BL(597)
Decremented only
for up-differentiation.
Wd: D00100 Wd+1:
−1
: Execution of @− −BL(597)
Decrement Decrement
Section 3-10
Wd
Wd: D00100
D00101 Wd: D00100