Siemens simatic hmi op27 Equipment Manual page 201

T est Functions
The result of the test appears in the display as each test is completed:
OK:
DEF :
Terminate test
The test program can only be terminated by switching off the power supply to
program the OP27.
C-2
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The tests can also be started by pressing one of the function
keys depicted on the right.
Test completed without error.
The functional unit tested is defective.
Return to the selection screen by pressing one of the following
system keys:
F1 F14
...
K10
K1
...
ESC
ACK
OP27, OP37 Equipment Manual
Release 05/99