Rockwell-automation 9301 Series RSView32 Users Guide Bedienungsanleitung PDF herunterladen (Seite 143)

100

101

Configuring alarms  6–17

Using wildcards in alarm expressions

For built-in alarm functions, you can use wildcards in the expression

to retrieve information about multiple tags at once.

For example, the following expression checks if any of a group of tags

is in alarm:

ALM_IN_ALARM (alarm*)

where alarm* represents all tags whose names begin with “alarm.” If

one or more of these tags are in alarm, the expression result is 1. If all

of the tags are out of alarm, the expression result is 0.

Note that using wildcards in alarm expressions may have an impact on

performance if the pattern matches a large number of tags. See “Tag

functions” on page 14-15 for a list of the alarm functions.

Acknowledge bit (globally acknowledging

alarms)

When you set up an acknowledge bit for a tag, all RSView32 stations

can be set up to monitor that bit automatically at runtime. When an

operator acknowledges an alarm for that tag, the acknowledge bit is

set. If an alarm is acknowledged on one machine, all other machines

log a RmAck (Remote Acknowledge) transaction in the alarm log file.

All other RSView32 stations then acknowledge the alarms associated

with that bit. In this way, operators can acknowledge alarms globally.

This wildcard Does this

* Matches any number of characters, including the

backslash (\) character.

? Matches any single character.

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