5. Alarms
Name of the alarm Appearance date and time
.
Number of the bit at the origin of alarm triggering
Status line
Code for appearance (ON)
Acknowledgment (ACK)
Disappearance without acknowledgment (OFF)
Absent: no alarm
Steady yellow : alarm acknowledged (ACK) - Alarm at state ON
Steady green: alarm at state OFF (must be acknowledged if the caracteristic of the alarm is to be acknowledged)
Flashing red: alarm at state ON
Direct display of the alarm indicated in the strip (without displaying the alarm list) is performed by pressing the keys shown opposite.
On touchscreen terminals, press directly the alarm strip.
- On-line printing:
see "Continious printing of an alarm page", Page 59 .
- Alarm bit:
see chapter B, "Application/Alarm/Help/Recipe pages", Page 38
.
- Alarm relay:
see "Alarm relay command", Page 45 .
Alarm page parameters
Ex.
NOTE
Alarm pages have various parameters:
- A 32-character maximum message. This message will be displayed in the alarm strip, the alarm list and the history and will be printed,
- Text, variable fields, static graphic objects used to indicate the fault and the relevant corrective actions.
Conveyor fault
Turn power off
Remove jammed part
Restart
The alarm page can remain empty on request of the designer. The management of alarms is then provided by messages only.
- a priority,
- a request for acknowledgement,
- an alarm relay command,
- an assignment to a group of alarms,
- a type of action on alarm appearance (display, printing, storage).
D
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D - 39
5. Alarms
Alarm table
- A word bit is associated with each separate alarm. All these words make up the alarm table which is part of the dialog table.
- A terminal can process the alarms from several PLCs.
- The alarm table can be distributed between several of the automated process's PLCs.
For each PLC, the alarm bits are distributed in packets of 16 alarms, i.e.,
"n" words of 16 bits per PLC.
The terminal can accept up to 32 words depending on the type of terminal.
Ex.
PLC dialog table containing
5 alarm words
5
PLC 1 dialog table containing 3 alarm words and 2 acknowledgment words associed (*1)
.
2
PLC 2 dialog table containing 4 alarm words and the 2 acknowledgment words associed (*1)
.
2
3
4
D - 40
* 1 : words "N° last acknowledged alarm" and "last acknowledged alarm
group" ( see chapter C, § 2. Dialog table content, Page 9 ).
Any given alarm may be triggered by several differents bits that may belong to diffenrent PLCs.
see "Alarm table", Page 41
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