What It Is and Where It Fits
The Siemens 3RK2207-1BQ50-0AA3 is an AS-Interface compact module from the K60 family — an analog A/B slave with 2 analog inputs designed for current measurement in the field, IP67 rated. It accepts 4..20 mA or ±20 mA from 4-wire sensors via two M12 screw-type connectors, with a configurable smoothing function and 14-bit A/D resolution. The module draws power from the AS-Interface bus (26.5...31.6 V) and requires an auxiliary 24...30 V supply (Uaux) for the sensors, consuming up to 160 mA from the bus at 30 V and up to 500 mA from Uaux.
Deployment Context — Field-Mounted Analog Acquisition
With IP67 protection, this module mounts directly on the machine or conveyor — no enclosure needed for washdown or dusty environments. It fastens to standard rail or a wall using the 3RK1901-0CA00 mounting plate (ordered separately). The 60 x 152 x 29 mm footprint (W x H x D) fits the K60 compact profile; the M12 connectors face downward, keeping the cable entry clean on a DIN-rail or panel mount. Two green LEDs indicate AS-Interface communication and auxiliary power status; a red LED signals a fault — useful for a field tech walking the line.
Selection and Sizing for the BOM
This is an analog input module only — zero analog outputs (0 AO). If your application needs both AI and AO on one AS-i node, you need a different K60 variant. The 2 inputs support 2-, 3-, or 4-conductor sensors, configurable per channel (channels 1 and 2 active). The measuring range is adjustable between 4...20 mA and ±20 mA, set via the AS-i master or the module's ID code 'A' with I/O configuration '7' and profile '7.A.9'. Ensure your master supports Spec. 3.0 for A/B slave addressing. The module draws 46 mA from the bus without the auxiliary supply active, and up to 160 mA with it — factor this into your AS-i power budget, especially on longer cable runs.
Lifecycle and Sourcing Reality
For a BOM freeze or new design, the part is sourced through standard Siemens distribution channels. The mounting plate 3RK1901-0CA00 is a separate line item — don't forget it in your BOM.