Omron CJ - PROGRAMMING MANUAL 12-2009 - Startup Settings and Maintenance; Specifying a Reset Start with MSKS(690); Reading the Internal Timer PV with MSKR(692)

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Startup Settings and Maintenance Section 6-6
6-5-2 Specifying a Reset Start with MSKS(690)
When CJ1M CPU Units are used and the MSKS(690) instruction is used to
start the scheduled interrupt, the internal timer can be reset before starting
the interrupt (this is called a reset start).
This method can be used to specify the time to the first interrupt without using
the CLI(691) instruction.
Scheduled interrupts are started by using the MSKS(690) instruction to set
the scheduled interrupt time (interval between two interrupts). After executing
the MSKS(690) instruction, however, the time required before the first sched-
uled interrupt task starts (first interrupt start time) is fixed only if the CLI(691)
instruction is specified. Therefore, CJ1M CPU Units provide an internal timer
reset start, allowing the time to the first interrupt to be set without using the
CLI(691) instruction.
MSKS(690) Instruction Operand (Only when Scheduled Interrupt Is Specified)
6-5-3 Reading the Internal Timer PV with MSKR(692)
CJ1M CPU Units allow reading the PV of the internal timer that measures the
scheduled interrupt time. The time is read from either the scheduled interrupt
start point or the previous scheduled interrupt point. The internal timer PV is
read by executing the MSKR(692) instruction. The unit of time depends on the
scheduled interrupt unit time setting in the PLC Setup, in the same way as for
the scheduled interrupt time.
MSKR(692) Operands (Only when Scheduled Interrupt Is Specified)
6-6 Startup Settings and Maintenance
This section describes the following functions related to startup and mainte-
nance.
• Hot Start/Hot Stop Functions
• Startup Mode Setting
• Power OFF Detection Delay Setting
• Disabling Power OFF Interrupts
• RUN Output
• Clock
• Program Protection
Operand Set value
N (Interrupt number) 4: Scheduled interrupt 0, normal setting (internal timer not
reset)
5: Scheduled interrupt 1, normal setting (internal timer not
reset)
14: Scheduled interrupt 0, specifies reset start (CJ1M CPU
Units only)
15: Scheduled interrupt 1, specifies reset start (CJ1M CPU
Units only)
Operand Set value
N (Interrupt number) 4: Scheduled interrupt 0, reads scheduled interrupt time (set
value)
5: Scheduled interrupt 1, reads scheduled interrupt time (set
value)
14: Scheduled interrupt 0, reads internal timer PV (CJ1M CPU
Units only)
15: Scheduled interrupt 1, reads internal timer PV (CJ1M CPU
Units only)