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Messages
Message bit
If there is a condition present in the current process that causes a message to
procedure
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".
Event message
Define an event message area for event messages in your configuration. In
area
ProTool, you set the event message area by choosing System
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.
Figure 7-1 Assigning Event Message Areas and Message Numbers
Updating
When the OP3 detects a message as having arrived, it reads the value it has
messages
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.
Manual change of
If a message departs while it is being displayed, the display is updated, i.e.
message level
the next message is shown automatically.
Temporary message
If a message departs, the very same screen from which the OP3 branched to
level
the message level is displayed again (refer to section 4.1).
7-2
Message No.
Address
Bit No.
area 1
Message No.
Address
area 2
Bit No.
8
7
6
5
4
3
7
6
5
4
3
2
16
15 14 13
12 11 10
7
6
5
4
3
2
. .
.
Operator Panel OP3
Area Pointer
2
1
1
0
9
1
0
Edition 11/99
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