The Siemens 3RS7003-2DE00 is a SIRIUS single-range signal converter — a 1-channel device that takes a 4-20 mA analog input and provides an isolated output, powered by a 24 VAC/DC supply rail. It draws 0.29 W and carries an IP20 rating, so it belongs inside a control cabinet, not on the machine frame.
The 4-20 mA input is the standard loop for process transmitters — pressure, flow, level, temperature — so this converter is the front-end interface between a field instrument and a PLC analog card. The 24 VAC/DC supply matches the most common control voltage in industrial panels; the AC/DC tolerance means it works on either a 24 VDC power supply or a 24 VAC control transformer without a separate rectifier. The 0.29 W consumption is negligible for bus-bar sizing — you can run a dozen of these off a single 2 A supply. Isolation between input and output is present, which is critical for breaking ground loops between the field loop and the controller side.
The 93 mm height and 72.5 mm depth keep it within the envelope of most terminal blocks and slim PLC slices. Wiring is via screw terminals accepting 20-14 AWG solid or stranded (1 x 20-14 AWG per clamp). The LED on the front panel gives a quick visual on loop presence — useful during commissioning when you're tracing a 4-20 mA signal across a row of converters.