What This Module Does on the AS-Interface Bus
The Siemens 3RK1207-1BQ44-0AA3 is an AS-Interface compact module in the K60 form factor, functioning as an analog slave with 4 analog inputs for current measurement. It accepts 2-, 3-, or 4-wire sensors and provides an adjustable measuring range of 4...20 mA or ±20 mA, with 16-bit A/D resolution. The module draws its operating power from the AS-Interface profile conductors (26.5...31.6 V per the AS-Interface specification) and can also draw up to 500 mA from an auxiliary sensor supply (Uaux) at 24...30 V.
IP67 Rating and Field Deployment
Rated IP67, this module is built for direct field mounting on machinery or conveyors — not just inside a control cabinet. The housing seals against dust and temporary water immersion, so it survives washdown environments and wet production areas. Connections use M12 screw-type terminals (4-conductor), standard for field I/O in automotive and food processing lines.
The module measures 60 mm wide, 152 mm high, and 29 mm deep. The ID code is 3, and the I/O configuration is 7 — these parameters are set during AS-Interface network commissioning.
Status Indication and Commissioning
The module provides three LED indicators: green for AS-Interface communication, green for auxiliary power (Uaux) present, and red for fault conditions. A configurable smoothing function is available on the analog inputs to dampen signal noise from vibrating sensors or turbulent flow measurements.