Vigilohm IM10 and IM20 Insulation monitoring device – User manual PDF
VIGED310022EN-04

Alarm event records

Each event is stored using two records:

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

  • A "secondary" record, which is created when the insulation alarm or prevention insulation alarm disappears. This contains the type of event (acknowledged insulation alarm, transient insulation alarm, prevention insulation alarm).

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

  • 1020...1021, 1110

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 (coded in Float32 in the last 2 registers).

  • Secondary record (when the event disappears or is acknowledged) — Type of insulation (encoded in Uint16 on the last register)
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

  • 1020

Record identifier:

  • Primary record plus secondary record

  • Float32 value (insulation resistance)

  • Value of register 1020 (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

  • 1110

Record identifier:

  • Secondary record

  • Uint32 value (alarm acknowledged)

  • 1110 register value ( product status register).
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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