The ABB BDB/S 1.1 Data Logging Unit (order code BDB/S1.1) records operating cycles and operating hours across 35 channels for maintenance planning on KNX. Configurable limit values trigger messages when thresholds are exceeded.

The compact 2 MW MDRC device is bus-powered — ideal for counting filter runtimes, pump cycles, valve actuations, and similar wear indicators.

Key Features

• 35 logging channels: Track operating cycles and/or operating hours per channel.
• Limit messages: Send KNX telegrams when configured thresholds are reached.
• Maintenance planning: Support predictive service for HVAC and other plant.
• Bus-powered: No auxiliary mains — only KNX TP.
• Compact MDRC: 2 modular widths on the DIN rail.
• Related HVAC: Pair with controllers such as AC/S1.1.1 and interfaces like BCI/S1.1.1.

At a Glance

Specification	Detail
Product type	KNX data logging unit, MDRC
Order code	BDB/S1.1
Product ID	2CDG110067R0011
Channels	35 (cycles / operating hours)
Limit signalling	Configurable KNX messages
Supply	KNX bus only
Width	2 MW
Bus system	KNX TP

Technical data, product information, installation instructions, application software, drawings, EPLAN, and declarations are under Downloads.

Applications

• Filter & fan runtime: Count hours until service intervals.
• Pump & valve cycles: Log switching cycles for wear estimation.
• Maintenance alarms: Threshold telegrams to visualization or BMS.
• Plant overview: Combine with AC/S1.1.1 data logging modules for broader HVAC analytics.

Installation Notes

Mount on a 35 mm DIN rail (2 MW). Connect KNX only — no auxiliary supply. Assign the physical address and import the application from Downloads. Wire logical counters via group objects (no field I/O on the device itself).