Omron CJ1M-CPU series Programming Manual

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Using a Scheduled Interrupt as a High-precision Timer (CJ1M Only) Section 6-5
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)
Operand Set value
N (Interrupt identi-
fier)
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 onlyÅj
15: Scheduled interrupt 1, specifies reset start (CJ1M CPU
Units onlyÅj
Operand Set value
N (Interrupt identifier) 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 onlyÅj
15: Scheduled interrupt 1, reads internal timer PV (CJ1M
CPU Units onlyÅj

Omron CJ1M-CPU series Specifications

General

Series	CJ1M
Program Memory	Flash Memory
Power Supply Voltage	24V DC
Operating Temperature	0 to 55°C
Type	Programmable Controller
CPU Type	CPU11, CPU12, CPU13, CPU21, CPU22, CPU23
Data Memory	SRAM
Data Memory Capacity	32K words (CJ1M-CPU11/12/13), 64K words (CJ1M-CPU21/22/23)
Instruction Execution Time (Basic Instructions)	0.1 μs (LD instruction)
Instruction Set	Basic instructions, advanced instructions
Programming Language	Ladder Diagram, Structured Text, Function Block Diagram
Communication Ports	RS-232C
Expansion Slots	Up to 3
Mounting	DIN rail mounting
Storage Temperature	-25 to 70°C
Dimensions	90 x 90 x 70 mm
Weight	Approx. 200g (0.44 lb)
Number of Instructions	Over 400 instructions