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INM MTL SUM5 Rev 7
DRAFT - 09 June 2021 DRAFT - 09 June 2021
30.13 ISA R – Ringback
Sequence Features
1. Acknowledge, reset and test pushbuttons.
2. Alarm audible device. (optional Ringback audible device)
3. Lock In of momentary alarms until acknowledged
4. The audible device is silenced and the ashing stops when acknowledged
5. Ringback visual ad audible indications when the process condition returns to normal
6. Manual reset of Ringback indications
7. Operational test
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