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Troubleshooting Problems with Unit Versions on the CX-Programmer
Problem Cause Solution
After the above message is displayed, a compiling
error will be displayed on the Compile Tab Page in the
Output Window.
An attempt was made to down-
load a program containing
instructions supported only by
later unit versions or a CPU Unit
to a previous unit version.
Check the program or change
to a CPU Unit with a later unit
version.
An attempt was to download a
PLC Setup containing settings
supported only by later unit ver-
sions or a CPU Unit to a previous
unit version.
Check the settings in the PLC
Setup or change to a CPU Unit
with a later unit version.
“????” is displayed in a program transferred from the
PLC to the CX-Programmer.
An attempt was made to upload a
program containing instructions
supported only by higher versions
of CX-Programmer to a lower ver-
sion.
New instructions cannot be
uploaded to lower versions of
CX-Programmer. Use a higher
version of CX-Programmer.
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