Vigilohm IFL12MCN Insulation Fault Locator – User manual PDF
7EN02-0421-03

Alarm event records

Each event is stored using two records:

  • A "primary" record, which is created when the insulation alarm occurs. This contains the insulation value.

  • A "secondary" record, which is created for the following type of events:

    • Acknowledged insulation alarm

    • Transient insulation alarm

    • Power failure or power cycle

    • Toroid disconnect

    • Locating signal unavailable

    • Product or channel error

    • Automatic commission initiation

Description of an Event Record in the Log

Register Unit Type Range Description
Word 1 – Uint16 1...65535 Event record number

Word 2

Word 3

Word 4

Word 5

 – Uint64 – Time tagging of event (using the same code as for the product date/time)

Word 6

Word 7

 – Uint32

  • 0….1

  • 0x40, 0x20

  • 10000...10023, 1110...1134

Record identifier:

  • Word 6, most significant byte: information for primary/secondary record. This field takes the value 1 for the primary record and value 0 for the secondary record.

  • Word 6, least significant byte: type of data stored in the Value field.

  • Word 7: address of the Modbus register that is the source of the data in the Value field.

Word 8

Word 9

Word 10

Word 11

 – Uint64 –

Depending on the type of record (primary or secondary):

  • Primary record (when the event occurs): Insulation resistance value (in Ohm) when the event occurred (encoded in Float32 in the last 2 registers).

  • Secondary record (for the earlier list of events) (encoded in Uint32 in the last 2 registers)
Word 12 – Uint16 1...65534

Primary/secondary record identifier for the event:

  • In the case of a primary record for an event, this identifier is an odd integer; numbering starts at 1 and the number is incremented by 2 for each new event.

  • In the case of a secondary record for an event, this identifier is equal to the primary record identifier plus 1.

Example of an event

The next 2 records relate to an example insulation alarm that occurred on October 1, 2010 at 12:00 pm and was acknowledged at 12:29 pm.

Record number: 1

Address Register Unit Type Value Description
dec hex dec hex
20002 4E22 20003 4E23 – Uint16 1 Record number
20003 4E23 20004 4E24 – Uint64

  • 10

  • 0

  • 10

  • 1

  • 12

  • 0

  • 0

 Date when insulation alarm occurred (October 1, 2010, 12:00 pm)
20007 4E27 20008 4E28 – Uint32

  • 1

  • 0x40

  • 10000

Record identifier:

  • Primary record plus secondary record

  • Float32 value (insulation resistance)

  • Value of register 10000 (register for insulation resistance monitoring)
20009 4E29 20010 4E2A Ohm Uint64 10000 Insulation resistance value at the time of the insulation alarm
20013 4E2D 20014 4E2E – Uint16 1 Secondary record identifier for the event

Record number: 2

Address Register Unit Type Value Description
dec hex dec hex
20014 4E2E 20015 4E2F – Uint16 2 Record number
20015 4E2F 20016 4E30 – Uint64

  • 10

  • 0

  • 10

  • 1

  • 12

  • 29

  • 0

 Date when insulation alarm acknowledged (October 1, 2010, 12:29 pm)
20019 4E33 20020 4E34 – Uint32

  • 1

  • 0x20

  • 1112

Record identifier:

  • Secondary record

  • Uint32 value (alarm acknowledged)

  • 1112 register value (channel status).
20021 4E35 20022 4E36 – Uint64 8 Value of insulation alarm register at the time of insulation alarm acknowledgement
20025 4E39 20026 4E3A – Uint16 2 Secondary record identifier for the event
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