Siemens SIMATIC HMI OP3 Equipment Manual page 30

Using the OP3 with Its Standard Functions
Changing
The change from screen level to message level, or back again, is either
operating levels manual or automatic.
Manual change
You press the appropriate key and change the operating level
You cannot branch backward from the message level by pressing ESCAPE.
The key is merely designed to terminate the display of a system message at
this level. Figure 4-1 shows how you switch from one operating level to the
other.
Figure 4-1 Changing between Message Level and Screen Level
Automatic change
The OP3 returns immediately to the temporary message level when a
message arrives. If the message is acknowledged by pressing ENTER or if it
departs, the very same screen from which the OP3 branched to the message
level is displayed again. If several messages arrive simultaneously, all
messages are acknowledged by pressing ENTER.
All inputs not confirmed by pressing ENTER before the OP3 branched to
message level are canceled.
Operation in the If several messages are queuing, you can view several messages in
temporary succession by scrolling with the UP and DOWN keys. Only UP, DOWN and
message level ENTER are allowed at the temporary message level.
Nesting level
If you jump from one screen to another, the OP3 can retain a total of twenty
jumps. You return by pressing ESCAPE.
If the nesting level of twenty screens is exceeded, the OP3 jumps –
subsequent to a temporary message display – to the twentieth screen, not to
last screen that was called.
4-2
from message level to screen level by pressing the ENTER key,
from screen level to message level by pressing the ESCAPE key.
Message level
ENTER
Screen level
ESC
System message
Operator Panel OP3
Edition 11/99