349
I/O Allocations Section 8-1
8-1-3 Precautions when Using Memory Cards
With CJ-series CPU Units with unit version 2.0 or later, the I/O allocation
method used to create the CPU Unit's I/O table (automatic I/O allocation at
startup or user-set I/O allocation) is recorded in the parameter file for auto-
matic transfers at power ON (AUTOEXEC.STD). When automatic transfer at
power ON is executed from the Memory Card, the recorded method is auto-
matically detected and used to allocate I/O automatically at power ON or ver-
ify the I/O table.
The descriptions below explain the two different methods used to create the
I/O table by the CPU Unit that creates the parameter file for automatic trans-
fers at power ON (AUTOEXEC.STD).
• Automatic Allocation at Startup (See note.)
The I/O tables in the parameter file for automatic transfer at power ON in
the Memory Card are disabled and I/O is allocated using automatic I/O
allocation at startup based on the Units actually mounted in the PLC.
• User-set I/O Allocations
The I/O tables in the parameter file for automatic transfer at power ON in
the Memory Card are enabled, and the CPU Unit compares and verifies
the I/O table with the Units actually mounted in the PLC.
Note With automatic I/O allocation at startup, I/O tables are not created in advance
and I/O allocations are automatically made to the Basic I/O Units that are
actually mounted each time the power supply is turned ON.
■ Previous CPU Units (Pre-Ver. 2.0 CPU Units)
With earlier versions of the CJ-series CPU Units, there wasn't a function that
recorded in the AUTOEXEC.STD parameter file which method was used to
create the CPU Unit's I/O tables. The user-set I/O allocation method was
automatically used in the parameter file when an automatic transfer at startup
was executed from the Memory Card, and I/O was allocated according to the
I/O tables in the parameter file and the I/O tables verified against the Units
actually mounted in the PLC. If a parameter file for automatic transfer at power
ON was created using the automatic I/O allocation at startup method in an
office with the CX-Programmer connected online to the CPU Unit without any
I/O Units connected, an I/O setting error would occur when the Memory Card
was mounted to a CPU Unit and the power supply was turned ON.
Office Remote site
Create program files for automatic transfer
at power ON (AUTOEXEC.OBJ) and
parameter files for automatic transfer
at power ON (AUTOEXEC.STD).
Units mounted.
I/O is allocated according to settings in mounted Units.
CJ1-H, CJ1M CPU Unit
Ver. 2.0 or later
Automatic I/O Allocation at Startup
Parameter file for automatic
transfer at power ON
(AUTOEXEC.STD)
Records allocation method in
parameter file for automatic
transfer at power ON
(AUTOEXEC.STD)
Note: The parameter file for automatic transfer at power ON
(AUTOEXEC.STD) is present, but I/O is allocated by the I/O
allocations in the mounted Units.
Automatic I/O Allocation at Startup
CJ1-H, CJ1M CPU Unit
Ver. 2.0 or later
Units not mounted.
Parameter file for automatic
transfer at power ON
(AUTOEXEC.STD)
Program file for automatic
transfer at power ON
(AUTOEXEC.OBJ)
Memory Card
CX-Programmer
Match
(See note.)
Program file for automatic
transfer at power ON
(AUTOEXEC.OBJ)
To Next Page
Loading...
