7-2
Operator Panel OP3
Edition 11/99
If there is a condition present in the current process that causes a message to
be issued – for example, a setpoint has been reached – a bit is set by the PLC
application program in the data area for event messages. The OP3 reads the
data area after a configured polling time. In this way, a message is detected
as having ”arrived”. The bit is reset by the PLC when the condition for
issuing the message no longer exists. The message is then regarded as
having”departed”.
Define an event message area for event messages in your configuration. In
ProTool, you set the event message area by choosing System → Area Pointer
from the menu.
You can configure a single event message for every bit that has been confi-
gure in the event message area. The event message area (up to 64 bytes) can
be divided into as many as four event messages. The address areas must not
be contiguous.
Figure 7-1 shows the assignment of bit numbers to message numbers for data
bytes. Bit numbers are assigned automatically to message numbers on the
OP3.
Message No.
07
Bit No.
87654321
16 15 14 13 12 11 10 9
123456
Message No.
07
Bit No.
123456
.
.
.
Address
area 1
Address
area 2
Figure 7-1 Assigning Event Message Areas and Message Numbers
When the OP3 detects a message as having arrived, it reads the value it has
to display for the message variables supplied by the PLC and displays them.
The fields defined in the messages are updated periodically at the configured
polling time.
If a message departs while it is being displayed, the display is updated, i.e.
the next message is shown automatically.
If a message departs, the very same screen from which the OP3 branched to
the message level is displayed again (refer to section 4.1).
Message bit
procedure
Event message
area
Updating
messages
Manual change of
message level
Temporary message
level
Messa
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