Omron CJ - 08-2008 Operation Manual page 335

PLC Setup
Cases when settings must be changed
The RS-232C port will not be used with the Programming Console
or CX-Programmer (peripheral bus) communications speed auto-
detection and will not use the default host link communications set-
tings such as 9,600 bps.
Note Pin 5 of the DIP switch on the front of the CPU Unit must be
OFF to change the PLC Setup settings.
You want to speed up communications with a PT via an NT Link.
You want the intervals for scheduled interrupts to be set in units of
1 ms (or 0.1 ms) rather than 10 ms.
You want CPU Unit operation to be stopped for instruction errors,
i.e., when the ER Flag or AER Flag is turned ON. (You want instruc-
tion errors to be fatal errors.)
You want to find the instructions where instruction errors are occur-
ring (where the ER Flag is turning ON.
You want a minimum cycle time setting to create a consistent I/O
refresh cycle.
You want to set a maximum cycle time other than 1 second (10 ms
to 40,000 ms).
You want to delay peripheral servicing so that it is executed over
several cycles.
You want to give priority to servicing peripherals over program exe-
cution. Here, "peripherals" include CPU Bus Units, Special I/O
Units, the built-in RS-232C port, and the peripheral port.
Performing special processing when power is interrupted.
You want to delay the detection of a power interruption.
You want to execute IORF or FIORF (CJ1-H-R CPU Units only) in
an interrupt task.
You want to shorten the average cycle time when a lot of Special
I/O Units are being used.
You want to extend the I/O refreshing interval for Special I/O Units.
You want to improve both program execution and peripheral servic-
ing response.
You do not want to record user-defined errors for FAL(006) and
FPD(269) in the error log.
You want to reduce fluctuation in the cycle time caused by text
string processing
You do not want to wait for Units to complete startup processing to
start CPU Unit operation.
You want to use high-speed counters with the built-in I/O. (See note
4.)
You want to use interrupt inputs with the built-in I/O. (See note 4.)
You want to use quick-response inputs with the built-in I/O. (See
note 4.)
You want to use general-purpose inputs for the input filter function
with the built-in I/O. (See note 4.)
You want to use the origin search function with the built-in I/O. (See
note 4.)
Setting(s) to be changed
RS-232C Port Settings
Set the peripheral port or the RS-232C port commu-
nications port baud rate to "high-speed NT Link."
Scheduled Interrupt Time Units
Instruction Error Operation
Minimum Cycle Time
Watch Cycle Time
Fixed Peripheral Servicing Time
Peripheral Servicing Priority Mode
Power OFF Interrupt Task (See note 5.)
Power OFF Detection Delay Time (See note 5.)
Special I/O Unit Cyclic Refreshing
CPU Processing Mode (CJ1-H CPU Units only)
FAL Error Log Registration (CJ1-H CPU Units only)
Background Execution for Table Data, Text String,
and Data Shift Instructions (CJ1-H CPU Units only)
Startup Condition (CJ1-H CPU Units only)
Use/Don't use high-speed counter 0.
Use/Don't use high-speed counter 1.
IN0 to IN3 input operation settings.
IN0 to IN3 input operation settings.
General purpose IN0 to IN9 input time constants.
Pulse outputs 0/1: Origin search operation setting
Section 7-1
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