Omron CX-PROGRAMMER V9 - REV 12-2009 Operation Manual page 29

Troubleshooting Problems with Unit Versions on the CX-Programmer
Problem
After the above message is displayed, a compiling
error will be displayed on the Compile Tab Page in
the Output Window.
"????" is displayed in a program transferred from the
PLC to the CX-Programmer.
Cause
An attempt was made using CX-
Programmer version 4.0 or
higher to download a program
containing instructions supported
only by CPU Units Ver. 2.0 or
later to a Pre-Ver. 2.0 CPU Units.
An attempt was made using CX-
Programmer version 4.0 or
higher to download a PLC Setup
containing settings supported
only by CPU Units Ver. 2.0 or
later (i.e., not set to their default
values) to a Pre-Ver. 2.0 CPU
Units.
CX-Programmer version 3.3 or
lower was used to upload a
program containing instructions
supported only by CPU Units
Ver. 2.0 or later from a CPU Unit
Ver. 2.0 or later.
Solution
Check the program or change
the CPU Unit being
downloaded to a CPU Unit
Ver. 2.0 or later.
Check the settings in the PLC
Setup or change the CPU Unit
being downloaded to a CPU
Unit Ver. 2.0 or later.
The new instructions cannot
be uploaded using CX-
Programmer version 3.3 or
lower. Use CX-Programmer
version 4.0 or higher.
CX-Programmer_Page (
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