Omron CPM1 - PROGRAMING MANUAL 02-2001 Programming Manual page 74

CPM2A/CPM2C High-speed Counters
Method 1
Prohibit interrupts in the
normal program area while
executing the instruction.
If two or more comparison conditions are satisfied simultaneously (in the same
cycle), the interrupt for the condition closest to the beginning of the comparison
table will be executed.
Either target value comparison or range comparison can be used for high-speed
counter interrupts.
If an interrupt is generated during execution of one of the high-speed counter
control instructions, i.e., CTBL(63), INI(61), or PRV(62), these instructions will
not be executed within the interrupt program.
If an interrupt is generated while an instruction controlling the high-speed count-
er is being executed in the normal program area, the CTBL(63), INI(61), and
PRV(62), instructions will not be executed within the interrupt program. This situ-
ation can be avoided by means of the following programming.
Method 2
In the normal program area,
re-execute the instruction
that could not be executed.
Normal program area
Interrupt processing subroutines are defined by SBN(92) and RET(93), just like
ordinary subroutines.
An SBS UNDEFD error will be generated during the program check while an in-
terrupt processing subroutine is being defined, but execution will be normal.
Section
Interrupt program area
2-2
53