405.1200.037.2 - Rel.: 2.21 of 25/02/2008
36-9
Displaying
messages
The VT can display three types of message:
Information messages
,
ISA-1A Alarms
(in the case of terminals accepting them) and
Help mes-
sages
(HELP pages). The information and alarm messages can only be
displayed if, using VTWIN, the programmer has already prepared the list of
messages assigned to areas of memory in the device.
Which type of message is used is at the discretion of the programmer.
Information
messages
When an event occurs which has an information message assigned to it the
LEDs of the following keys start flashing:
Terminals VT50 and VT60 do not have LEDs, so there is no way
of understanding when an information message is present. You
are advised to define the priority of the messages with regard to the
page using the
Exchange area
(see also
Software Manual).
For graphic terminals without LEDs the screen shows
Note that the symbol is a triangle containing the character [i].
Information messages can be seen only when the event triggering them is
still present. When you press
you enter display mode, indicated by a fixed LED light (where terminals
have them), which is so structured as to allow one page for each message,
that page have the following format (formats vary according to the type of
VT).
The VT can provide an automatic sequential display of information mes-
sages on command from the device (see
).
Info
VT150W
VT160W
Others
Info
VT50
VT60
VT130W
Info
VT50
Info
VT150W
VT160W
Others
Info
Shift
+
Help
Esc
VT60
In fo
A la rm
VT130W
S h ift
+
Summary of Contents for VT130W
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