Siemens simatic hmi op7, Equipment Manual

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4-2
Equipment Manual OP7, OP17
Release 04/99
The operating level is changed either by the operator or automatically by the
OP (figure 4-1).
Change by the operator:
Press key
ENTER
to change the operating level from message level to screen level,
ESC
to change the operating level from screen level to message level.
You cannot branch backward from the message level by pressing ESC . The
key is designed to terminate the display of a system message at this level.
Forced change to message level:
You exit from the screen level automatically whenever a system message
or an alarm message is waiting to be displayed. The OP then changes to
message level to display the message. You cannot exit from the message
level while a system message or unacknowledged alarm message is being
displayed. The display of an unacknowledged alarm message is indicated
on the OP by flashing of
– the alarm message and
– the ACK-LED (icon ).
Press key
ACK
to acknowledge an alarm message,
ESC
to hide a system message.
After the alarm message has been acknowledged, the ACK LED goes off
and, after the system message has been hidden, the OP returns to the point
from which it changed to the message level.
ESC
ACK
ENTER
Figure 4-1 Changing between Message Level and Screen Level
Changing
operating levels