ICON Signals Alarm State

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• Overview

This data is taken from source file icon.libServices.AlarmBits.cs

AlarmState is a 64-bit signed value (C# long, MySQL BIGINT) found in database tables sensor_device, sensor_event and sensor_alarm (Flags).

The AlarmState value is a collection of bit flags that describe current alarm status for all I/O channels of the given device.

The nybbles of the least significant byte contains CH1 and CH2 information. Bit pairs in the next three bytes cover channels 3-14. The remaining single bit values cover channels 15-40. (TBD)

{byte 7} {byte 6} {byte 5} {byte 4} eeddccbb aa998877 66554433 22221111
   7        6        5        4        3        2        1        0

{byte 4} = alarm bits for channels 15-22 going from right to left
{byte 5} = alarm bits for channels 23-30 going from right to left
{byte 6} = alarm bits for channels 31-38 going from right to left
{byte 7} = alarm bits for channels 39-40 going from right to left, remaining bits reserved

This is more or less reflected in the database schema. Channels 1 and 2 are decimal values, channels 3-14 are short integers, and channels 15-40 are bit values only (ON or OFF).

The low alarm bit values are used when channels 1-14 are contact closures.

Internal Note: This data is taken from source file icon.libServices.AlarmBits.cs

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