Omron CJ2 CPU UNIT - Page 66

1 Overview
1-24
CJ2 CPU Unit Hardware User’s Manual
*7 Supported only by the CJ2M CPU Units.
*8 Pulse I/O Modules are supported only by CJ2M CPU Units with unit version 2.0 or later.
*9 Supported only by CJ2H CPU Units with unit version 1.1 or later.
Function Description
Interrupt Scheduled Interrupts A task is executed at a specified interval.
Resetting and restarting with
MSKS(690)
*7
When MSKS(690) is executed, the internal timer is restarted and the time to
first interrupt is set to a fixed value.
Reading present value of internal timer
with MSKS(690)
*7
MSKS(690) can be used to read the time that has elapsed until the scheduled
interrupt is started or since the previous scheduled interrupt.
Power OFF Interrupts A task can be executed when CPU Unit's power turns OFF.
I/O Interrupts A task can be executed when an input signal is input to an Interrupt Input Unit.
External Interrupts A task can be executed when interrupts are requested from a Special I/O Unit
or a CPU Bus Unit.
Input Interrupt Function
*8
A task is started for an interrupt input from a Pulse I/O Module or for a high-
speed counter input.
Input Interrupts Interrupt tasks are executed when the interrupt input turns ON or turns OFF.
Direct Mode: An interrupt task is executed each time an input signal changes.
Counter Mode: Changes in the input signal are counted up or down and the
interrupt task is executed when the counter counts out. (The maximum
response frequency is 3 kHz.)
High-speed Counter Interrupts An interrupt task is executed when preset comparison conditions for a high-
speed counter are met.
Target-value comparison: The interrupt task is executed when the count
matches a specified value.
Range comparison: The interrupt task is executed when the count enters or
leaves a specified range of values.
High-speed Interrupt Function
*9
Improves performance for executing interrupt tasks with certain restrictions.
Clock Clock Function Clock data is stored in memory.
Accuracy (Accuracy depends on the temperature.)
Ambient temperature of 55°C: −3.5 to +0.5 min error per month
Ambient temperature of 25°C: −1.5 to +1.5 min error per month
Ambient temperature of 0°C: −3 to +1 min error per month
Operation Start Time Storage The time when operating mode was last changed to RUN mode or MONITOR
mode is stored.
Operation Stop Time Storage The last time a fatal error occurred or the last time the operating mode was
changed to PROGRAM mode is stored.
Startup Time Storage The time when the power was turned ON is stored.
Power Interruption Time Storage The time when the power is turned OFF is stored.
Total Power ON Time Calculation The total time that the PLC has been ON is stored in increments of 10 hours.
Power ON Clock Data Storage A history of the times when the power was turned ON is stored.
User Program Overwritten Time Storage The time that the user program was last overwritten is stored.
Parameter Date Storage The time when the Parameter Area was overwritten is stored.