What it does and what ratings matter
The TM3AI4 is a 4-channel analog input module that sits in a Modicon TM3 rack. It handles both voltage (0-10 V, -10 to +10 V) and current (0-20 mA, 4-20 mA) signals, so it'll tie into most industrial transducers without a separate signal conditioner. Resolution is 12 bits (11 bits plus sign for the bipolar voltage range), which gives you about 0.1% steps on a 10 V span. Conversion time is 1 ms per channel plus one PLC cycle, which keeps up with typical process loops and slow-speed motion.
Mounting, wiring, and environment
The module snaps onto a TH35-15 or TH35-7.5 DIN rail (IEC 60715). It takes up one standard module slot — width is 23.6 mm, depth is 70 mm, height is 90 mm. Connects via removable screw terminal blocks, 1.5 mm² wire, pitch 3.81 mm. That's a compact footprint that leaves room alongside a CPU or other I/O. Rated IP20, so it belongs in a clean cabinet. Operating temperature is -10 to 55 °C horizontal, -10 to 35 °C vertical. Pollution degree 2. The module draws 35 mA at 5 V (no load) and 30 mA at 24 V — minimal drain on the bus power supply.