3 Nomenclature and Functions
3-6
CJ2 CPU Unit Hardware User’s Manual
*1 The following data cannot be overwritten when pin 1 is ON:
• All parts of the user program (programs in all tasks)
• All data in the parameter area (such as the PLC Setup and I/O table)
When pin 1 is ON, the user program and parameter area will not be cleared when the memory clear opera-
tion is performed from a Programming Device.
*2 I/O memory files (AUTOEXEC.IOM and ATEXEC@@.IOM) are automatically transferred when power is turned
ON if pin 2 is set to ON. Both the program (AUTOEXEC.OBJ) and parameter area (AUTOEXEC.STD) files
must be stored on the Memory Card. It is not necessary for the I/O memory files (AUTOEXEC.IOM and
ATEXEC@@.IOM) to be stored on the Memory Card.
*3 When pin 7 is ON, simple backup reading from the Memory Card is given priority, so even if pin 2 is ON, the
user program is not automatically transferred from the Memory Card when power is turned ON.
*4 Connecting to the PLC is not possible from the CX-One Support Software using SYSMAC WAY even if pin 5 on
the DIP switch is OFF and the PLC Setup is set to the Host Link protocol (i.e., the default setting).
*5 With the CJ2M-CPU3@, pin 5 can be set only when a Serial Option Board is mounted.
DIP Switch
Pin no. Usage Setting Function Default
SW1 Used to prevent programs from being
accidentally overwritten from Program-
ming Devices (including the CX-Program-
mer).
ON
Writing disabled for user program memory.
*1
OFF
OFF Writing enabled for user program memory.
SW2 Set to ON to read the program
(AUTOEXEC.OBJ file) and parameter
area (AUTOEXEC.STD file) from the
Memory Card to the CPU Unit when
power is turned ON.
*2
Used to store the programs in the Mem-
ory Card to switch operations, or to auto-
matically transfer programs at startup
(Memory Card ROM operation).
*3
ON The user program is automatically trans-
ferred from the Memory Card when power is
turned ON.
OFF
OFF The user program is not automatically trans-
ferred from the Memory Card when power is
turned ON.
SW3 Not used. --- --- OFF
SW4 Not used. --- --- OFF
SW5 Set to ON to automatically detect the
baud rate of the CX-Programmer (periph-
eral bus only) when using the serial port
(RS-232C).
*4, *5
ON Serial port (RS-232C) communications con-
dition: Automatically detect CX-Programmer
(peripheral bus only) baud rate.
OFF
OFF Serial port (RS-232C) communications con-
dition: According to CX-Programmer commu-
nications settings in PLC Setup. (Refer to
Ta b le 1 .)
SW6 Set pin 6 to ON or OFF and use A395.12
in the program to create a user-defined
condition without using an Input Unit.
ON User-defined pin. Turns ON the User DIP
Switch Pin Flag (A395.12).
OFF
OFF User-defined pin. Turns OFF the User DIP
Switch Pin Flag (A395.12).
SW7 Set the simple backup type. (Refer to
Table 2 below.)
--- Specifies the simple backup type. OFF
SW8 --- Always
OFF.
--- OFF
12345678
ON
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