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PLC Setup Section 7-1
7-1 PLC Setup
7-1-1 Overview of the PLC Setup
The PLC Setup contains basic CPU Unit software settings that the user can
change to customize PLC operation. These settings can be changed from a
Programming Console or other Programming Device.
Note To read or set parameters in the PLC Setup, use the version of CX-Program-
mer that corresponds to the parameters.
For example, with CX-Programmer Ver.3.@, when the PLC Setup is uploaded
from a PLC that was used to set the PLC Setup for Unit Ver. 2.0 or later only,
the PLC Setup that was set cannot be downloaded again. (The following
screen will be displayed.) Use the CX-Programmer Ver. 4.0 in this case.
The following table lists cases in which the PLC Setup must be changed. In
other cases, the PLC can be operated with the default settings.
Cases when settings must be changed Setting(s) to be changed
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 Input Response Time
Data in all regions of I/O Memory (including the CIO Area, Work
Areas, Timer Flags and PVs, Task Flags, Index Registers, and Data
Registers) must be retained when the PLC’s power is turned on.
IOM Hold Bit Status at Startup
The status of bits force-set or force-reset from a Programming
Device (including Programming Consoles) must be retained when
the PLC’s power is turned on.
Forced Status Hold Bit Status at Startup
• You do not want the operating mode to be determined by the
Programming Console’s mode switch setting at startup.
• You want the PLC to go into RUN mode or MONITOR mode and
start operating immediately after startup.
• You want the operating mode to be other than PROGRAM mode
when the power is turned ON.
Startup Mode
Detection of low-battery errors is not required when using battery-
free operation.
Detect Low Battery
Detection of interrupt-task errors is not required. Detect Interrupt Task Error
Data files are required but a Memory Card cannot be used or the
files are written frequently. (Part of the EM Area will be used as file
memory.)
EM File Memory
The peripheral port will not be used with the Programming Console
or CX-Programmer (peripheral bus) communications speed auto-
detection and will not used the default host link communications
settings such as 9,600 bps.
Note Pin 4 of the DIP switch on the front of the CPU Unit must be
OFF to change the PLC Setup settings.
Peripheral Port Settings
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