A Modbus TCP data logger that knows when it is wrong

Meters, relays, inverters and BMS gateways still speak Modbus. Vault reads them efficiently, decodes every word order, and marks a dead device as a gap instead of logging its last value forever.

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Import the register map you already have

Every device comes with a register list. Put it in a CSV with the address, type, word order and scaling, and Vault imports it. It then plans block reads of up to 125 registers so a meter with 80 values costs a handful of requests, not 80.

Every common type. 16, 32 and 64-bit integers, floats and doubles, bits from registers, coils and discrete inputs.
All four word orders. ABCD, BADC, CDAB and DCBA, set per signal, because devices disagree.
Exact scaling. Scale and offset applied without float rounding surprises.

name,address,type,order,scale,unit_id,group,units,description
POC.ActivePower,40001,float32,ABCD,,1,fast,kW,Export power at the point of connection
POC.Frequency,40003,float32,ABCD,,1,fast,Hz,Grid frequency
POC.ImportEnergy,40101,uint64,CDAB,0.1,1,slow,kWh,Import energy register
TX1.OilTemp,ir9,int16,,0.1,3,slow,°C,Transformer 1 top oil temperature

An illustrative register map in Vault's format. Addresses can be Modicon style (40001) or a register type and a zero-based address (hr0, ir9, co5, di2), and common column names from vendor exports are understood.

Telling a quiet device from a dead one

Modbus has no subscriptions and no quality codes, so a logger has to work out for itself when the data stopped being true.

Timeouts and exceptions: A timeout, a Modbus exception or a closed connection each give the affected signals their own bad quality, so the record shows what kind of failure it was.
Heartbeats: Point Vault at a counter or watchdog register and it marks the device's data stale when the counter stops moving, even if the device keeps answering.
Poll groups: Fast and slow groups per device, so a 100 ms frequency signal and a once-a-minute energy counter do not share a scan rate.
Unit IDs and gateways: Several unit IDs behind one Modbus TCP gateway, each with its own map and failure handling.

See Vault on your own plant

Early access sites get the full product, direct help from engineering, and their first site licence for £1,995 instead of £2,495.

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