Description of the device 
  4.7 PLUG 
SCALANCE W788-x / W748-1 
Operating Instructions, 03/2022, A5E03678333-17 
35 
Response to errors 
Inserting a PLUG that does not contain the configuration of a compatible device type, 
accidentally removing the PLUG/KEY-PLUG or general malfunctions of the PLUG are 
signaled by the diagnostics mechanisms of the device (LEDs, Web-Based Management 
(WBM), SNMP, Command Line Interface (CLI) and PROFINET diagnostics). The user 
then has the choice of either removing the PLUG again or selecting the option to 
reformat the PLUG. 
Note 
Incompatibility with previous versions with PLUG inserted
 
During the installation of a previous version of the firmware, the configuration data
 can 
be lost. In this case, the device starts up with the factory settings after the firmware has 
been installed. In this situation, if a PLUG is inserted in the device, following the restart, 
this has the status "NOT ACCEPTED" since the PLUG still has the
 configuration data of 
-to-date firmware. This allows you to return to the previous, more 
-to-date firmware without any loss of configuration data. If the original configuration 
on the PLUG is no longer required, the PLUG can be delet
ed or rewritten manually using