9 PLC Setup
9-2
CJ2 CPU Unit Software User’s Manual
9-1 Overview of the PLC Setup
The PLC Setup contains basic CPU Unit software parameter settings that the user can change to cus-
tomize PLC operation. These settings can be changed from a Programming Console or other Program-
ming Device. Change the PLC Setup in the following cases.
Application Parameter
The input response time settings for CJ-series Basic I/O
Units must be changed in the following cases:
• Chattering or noise occur in Basic I/O Units.
• Short pulse inputs are being received for intervals longer
than the cycle time.
Basic I/O Unit Rack Response Time
Data in all regions of I/O Memory (including the CIO Area,
Work Areas, Timer Flags and PVs, Task Flags, Index Regis-
ters, and Data Registers) must be retained when the PLC's
power is turned on.
IOM Hold Bit Status at Startup
The status of bits that are force-set or force-reset from a Pro-
gramming Device must be retained when the PLC's power is
turned ON.
Forced Status Hold Bit Status at Startup
• Debugging the PLC,
• Changing the Startup Mode to PROGRAM or MONITOR
mode.
Startup Mode
Detection of low-battery errors is not required when using
battery-free operation.
Detect Low Battery
Disabling detection of duplicate refreshing. Detect Duplicate Refresh Errors
The RS-232C port will not be used with the Programming
Console or CX-Programmer (peripheral bus) communica-
tions speed auto-detection and will not use the default host
link communications settings such as 9,600 bps.
*1
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 com-
munications port baud rate to “high-speed NT
Link.”
You want the intervals for scheduled interrupt function to be
set in units of 1 ms (or 0.1 ms) rather than 10 ms.
Scheduled Interrupt Time Units
You want to use high-speed interrupt function for an I/O inter-
rupt task or scheduled interrupt task.
Enable High-speed Interrupt Function
You want to use the synchronous unit operation function. Use Synchronous Operation
Finding instruction errors when debugging. Stop CPU on Instruction Error
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
Performing special processing when power is interrupted.
Power OFF Interrupt Task
*2
You want to delay the detection of a power interruption.
Power OFF Detection Delay Time
*1
• You want to execute IORF or FIORF 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
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