Omron CPM1 - PROGRAMING MANUAL 02-2001 Programming Manual page 414

Timer and Counter Instructions
Precautions
Flags
7-15-7 REGISTER COMPARISON TABLE – CTBL(63)
CTBL(63)
P
C
TB
Limitations
Description
396
If the execution conditions have not changed or have changed from ON to OFF
for both II and DI, the PV of CNT will not be changed.
When decremented from 0000, the present value is set to SV and the Comple-
tion Flag is turned ON until the PV is decremented again. When incremented
past the SV, the PV is set to 0000 and the Completion Flag is turned ON until the
PV is incremented again.
CNTR(12) is reset with a reset input, R. When R goes from OFF to ON, the PV is
reset to zero. The PV will not be incremented or decremented while R is ON.
Counting will begin again when R goes OFF. The PV for CNTR(12) will not be
reset in interlocked program sections or by the effects of power interruptions.
Changes in II and DI execution conditions, the Completion Flag, and the PV are
illustrated below starting from part way through CNTR(12) operation (i.e., when
reset, counting begins from zero). PV line height is meant to indicate changes in
the PV only.
Execution condition
on increment (II)
Execution condition
on decrement (DI)
Completion Flag
PV
Program execution will continue even if a non-BCD SV is used, but the SV will
not be correct.
Indirectly addressed DM word is non-existent. (Content of *DM word is
ER:
not BCD, or the DM area boundary has been exceeded.)
Ladder Symbols
@CTBL(63)
P
C
TB
This instruction is not supported by SRM1(-V2) PCs.
The first and last comparison table words must be in the same data area. (The
length of the comparison table varies according to the settings.)
P must be 000 and C must be between 000 and 003.
When the execution condition is OFF, CTBL(63) is not executed. When the
execution condition is ON, CTBL(63) registers a comparison table for use with
the high-speed counter PV. Depending on the value of C, comparison with the
high-speed counter PV can begin immediately or it can be started separately
with INI(61).
ON
OFF
ON
OFF
ON
OFF
SV
SV – 1
SV – 2
Operand Data Areas
TB: First comparison table word
IR, SR, AR, DM, HR, LR
Section
SV
SV – 1
0001
0000 0000
P: Port specifier
000
C: Control data
000 to 003
7-15
SV – 2