IEC60870-5-10x Point Quality Information

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The IEC60870-5-10x protocol provides point quality information along with point status.



Quality bits are not information elements in themselves, but appear as individual bits within information elements. Note that quality bits are set or cleared independently of each other. Examination of these shows that these may be used to differentiate between different types of situations or problems that may be affecting the data. The individual quality bits and their meanings are as follows:
| Quality Bit Name | Quality Bit ID | Quality Bit Description | Quality Bit ClearSCADA Mapping |

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Blocked	BL	This means that the value of the point is as it was prior to being blocked. Blocking prevents updating of the value of the point	OPC_QUALITY_LAST_USABLE
Substituted	SB	This is where a value has been substituted or forced by manual entry or otherwise. It means that the value is not derived from the normal measurement	OPC_QUALITY_LOCAL_OVERRIDE
Not Topical	NT	This is means that the value was not updated successfully at the last time it was due to be updated	OPC_QUALITY_LAST_USABLE
Invalid	IV	This indicates that the value cannot be used because it may be incorrect due to a fault or other abnormal condition	OPC_QUALITY_BAD
Overflow Bit	OV	This means that a value is out of a defined range. It is used primarily with analog or counter values	OPC_QUALITY_EGU_EXCEEDED
Elapsed Time Invalid	EI	This is used with events of protection equipment. If set it means that the elapsed time interval value is invalid. This means that for some reason the elapsed time value cannot be relied upon and should be ignored	Not currently used in ClearSCADA