Siemens simatic hmi op27 Equipment Manual page 20

Functions for The OPs are equipped with a range of function keys which can be assigned
function keys and operating functions, such as message logging on/off, screen selection and print
soft keys screen during configuration. The function keys may be assigned globally or
locally. Globally means that the assignment applies to the whole configuration.
Locally means that the assignment applies only to a single screen. A function
key whose assignment changes from one screen entry to another is known as a
soft key.
OP27, OP37 Equipment Manual
Release 05/99
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