405.1200.037.2 - Rel.: 2.21 of 25/02/2008
37-25
By “acknowledgment” we mean the confirmation on the part of the plant or
machine operator of having taken note of the alarm message.
For further details on how ISA-1A Alarms work see Software Manual.
When the symbol on the screen is touched you enter display mode, where
each page contains up to two alarms whose format is set out below.
The VT can provide an automatic sequential display of information mes-
sages on command from the device (see
“Chapter 38 -> Command area“).
VT525H -
VT1x5/515/525
/555/56xW
alarms
The page has the following format:
• Numerical identification of the ISA-1A alarm.
• Four rows of 30 characters with character height of X1 or two rows of 15
with character height of X2 for the text of the message.
• One row for any data field (which in that particular situation could indi-
cate a safety or warning limit value).
• One row starting with the character [>] for the date and time of the
appearance of the event (Event in).
• One row starting with:
• the character [#] for the date and time of the Event acknowledged
but still present.
• the character [<] for the date and time of the Event out but not
acknowledged.
• Graphic indication of the status of the alarm:
• Event in and not acknowledged [ ]
• Event in, present and acknowledged [ ]
• Event out and not acknowledged. [ ]
Examples with three alarms:
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