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Maximum Field Length |
10 characters |
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Definition |
Value defining tolerance below the upper alarm limits or above the lower alarm limit. If no deadband is defined, the alarm state of the point changes each time the alarm limit is passed (in either direction). |
A deadband is useful for points whose values may fluctuate near the alarm limit. The deadband value specifies that a point in an alarm state remains in the alarm state the value is equal to the alarm limit plus the deadband value.
For example, if a high alarm limit is 100 and the deadband is 5, an alarm is generated when the point value equals 100. However, the point is considered in an alarm state until it reports a value below 95 (the alarm limit plus the deadband). If a low alarm limit is 10 and the deadband is 5, an alarm is generated when the point value equals 10. However, the point is considered in an alarm state until it reports a value above 15 (the alarm limit plus the deadband).
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Point Field definitions. |
