Omron CP1L CPU UNIT - 06-2007 Operation Manual page 7

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Use the above display to confirm the unit version of the CPU Unit.
Procedure When the Device Type and CPU Type Are Not Known
This procedure is possible only when connected directly to the CPU Unit with
a serial connection.
If you don't know the device type and CPU type that are connected directly to
the CPU Unit on a serial line, select PLC - Auto Online to go online, and then
select PLC - Edit - Information from the menus.
The PLC Information Dialog Box will be displayed and can be used to confirm
the unit version of the CPU Unit.
Unit version
Unit version