Polytron 7000 Operation via PROFIBUS PA
84
Uncertain sub-status
Value
Bit 5, 4, 3, 2
Name Description
0 Non-specific There is no specific reason why the value is uncertain. Used for propagation.
1 Last Usable Value Whatever was writing this value has stopped doing so. (This happens when an
input is disconnected by a configurer.)
2 Substitute Set when the value is written when the block is not Out of Service.
3 Initial Value Set when the value of an input parameter is written while the block is Out of
Service.
4 Sensor Conversion not
Accurate
Set if the value is at one of the sensor limits. The Limits define which direction
has been exceeded. Also set if the device can determine that the sensor has
reduced accuracy (e.g. degraded analyzer), in which case no imits are set.
5 Engineering Unit
Range Violation
Set if the value lies outside of the range of values defined for this parameter.
The Limits define which direction has been exceeded.
6 Sub-normal Set if a value derived from multiple values has less than the required number of
Good sources.
Good (Non-cascade) sub-status
Value
Bit 5, 4, 3, 2
Name Description
0 Non-specific There is no specific reason why the value is good. No error or special condition
is associated with this value.
1 Active Block Alarm Set if the value is good and the block has an active Block Alarm.
2 Active Advisory Alarm Set if the value is good and the block has an active Alarm with a priority less
than 8.
3 Active Critical Alarm Set if the value is good and the block has an active Alarm with a priority greater
than or equal to 8.
4 Unacknowledged
Block Alarm
Set if the value is good and the block has an unacknowledged Block Alarm.
5 Unacknowledged Advi-
sory Alarm
Set if the value is good and the block has an unacknowledged Alarm with a
priority less than 8.
6 Unacknowledged Criti-
cal Alarm
Set if the value is good and the block has an unacknowledged Alarm with a
priority greater than or equal to 8.
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