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PLC Setup Section 7-1
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.
RS-232C Port Settings
You want to speed up communications with a PT via an NT Link. Set the peripheral port or the RS-232C port commu-
nications port baud rate to “high-speed 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.
Scheduled Interrupt Time Units
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.
Instruction Error Operation
You want a minimum cycle time setting to create a consistent I/O
refresh cycle.
Minimum Cycle Time
You want to set a maximum cycle time other than 1 second (10 ms
to 40,000 ms).
Watch Cycle Time
You want to delay peripheral servicing so that it is executed over
several cycles.
Fixed Peripheral Servicing Time
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.
Peripheral Servicing Priority Mode
Performing special processing when power is interrupted. Power OFF Interrupt Task
You want to delay the detection of a power interruption. Power OFF Detection Delay Time
You want to execute IORF 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.
Special I/O Unit Cyclic Refreshing
You want to improve both program execution and peripheral servic-
ing response.
CPU Processing Mode (CJ1-H CPU Units only)
You do not want to record user-defined errors for FAL(006) and
FPD(269) in the error log.
FAL Error Log Registration (CJ1-H CPU Units only)
You want to reduce fluctuation in the cycle time caused by text
string processing
Background Execution for Table Data, Text String,
and Data Shift Instructions (CJ1-H CPU Units only)
You do not want to wait for Units to complete startup processing to
start CPU Unit operation.
Startup Condition (CJ1-H CPU Units only)
You want to use high-speed counters with the built-in I/O. (See note
4.)
Use/Don’t use high-speed counter 0.
Use/Don’t use high-speed counter 1.
You want to use interrupt inputs with the built-in I/O. (See note 4.) IN0 to IN3 input operation settings.
You want to use quick-response inputs with the built-in I/O. (See
note 4.)
IN0 to IN3 input operation settings.
You want to use general-purpose inputs for the input filter function
with the built-in I/O. (See note 4.)
General purpose IN0 to IN9 input time constants.
You want to use the origin search function with the built-in I/O. (See
note 4.)
Pulse outputs 0/1: Origin search operation setting
Cases when settings must be changed Setting(s) to be changed
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