Page 108 - PBL614 IM/SM500F-EN SM500F ( WIRO)

SM500F
Field mountable paperless recorder 7 Configuration
Select an alarm enable source. When the 'Enable source' is active, the alarm is enabled. When the source is inactive the alarm is disabled. If set to 'None' the alarm is always enabled.
Note. For Delayed Process alarm operation, see Fig. 7.15, page 103. Set 'Log enable' to 'On' to record all changes in the alarm state in the
Alarm event log – see Section 4.7, page 43.
Set 'Acknowledge Timeout' to 'On' to enable an alarm acknowledgement timeout period that can then be set to between 1 and 999 minutes.
If the alarm is acknowledged but the alarm condition is not cleared within the time-out period, the acknowledge state is set back to 'active/unacknowledged'.
Note. The 'Acknowledge Timeout' function is designed to prevent an alarm from being acknowledged but the reason for the occurrence being ignored.
Example. An application has a vital requirement for a product to be kept below a certain temperature (the alarm setpoint) and the recorder's alarm relay is connected to an external audible warning device. If the temperature exceeds the alarm setpoint, the alarm is activated, triggering the audible warning. To preserve accountability, the alarm can be acknowledged only by an operator with alarm acknowledgement privileges (see Section 7.6.5, page 80) and if acknowledged, the audible warning is silenced. If the temperature does not drop below the alarm setpoint before the time-out period expires, the alarm state is reset to active/unacknowledged and the audible warning sounds again.
Assign the alarm to one or more of 12 groups.
The alarm states assigned to each group are 'ORed' together to create an internal digital signal that may be assigned to relays, digital outputs or internal digital controls.
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IM/SM500F Rev. AA