Request : Which mounting positions are permissible?

Suggestion : For the system ET200S (6ES7) included the motor starters 
   3RK1301 and the modules 3RK1903 a vertical mounting position on rail is 
   permissible.
   
   The best position is the vertical mounting of the devices on horizontal 
   rails, so that the inscription is written correctly, but it is also possible 
   to turn the devices by 180°, so that the inscription is up side down. It is 
   also possible to turn the devices by 90°, so that the rail is mounted 
   vertical and the devices are mounted horizontal.
   
   Please take care of the temperature in the switch cabinet. In dependence of 
   the mounting position, the temperature and the current derating factors are 
   to consider and / or distance modules are to mount.
   
   For the horizontal mounting of the rail (vertical mounting of the devices) 
   you will find a table in the manual in chapter 2.4.
   
   For the vertical mounting of the rail (horizontal mounting of the devices) 
   the following derating factors should be considered:
   Circuit breaker smaller/equal 6,3A: unil40°C no derating
   Circuit breaker bigger/equal 6,3A: unil 30°C no derating
   Circuit breaker bigger/equal 6,3A: 30°C unil 40°C with 90% of Ie