Proface AGP3500 - 10.4 DIO HMI" - Manual (Page 16)

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About Revision
The nameplate on the GP has the revision number of the GP. In the example below, the asterisk, which is placed at the “A”
position, shows that the revision number is “A”.
• Only for Rev.4 GP (where "*" is marked in the position of "4" on the nameplate), the "R4" mark
is placed on the nameplate.
When GP is Rev. A