The 6ES7921-4BC50-0AB1 is a pre-assembled front connector for SIMATIC S7-400 racks, built specifically for analog I/O modules. It comes with a 2.5 m braided-shield cable and 48 poles terminated at the connector end; the field end is four round cables, 0.14 mm² each, ready for screw terminals. Rated at 60 V and 1 A per pole, with a total current limit of 2 A across the assembly.
Mounts directly onto the S7-400 front connector slot — no adapter or end cover plate required. The cable exits at the top of the connector, which keeps the wiring bundle above the module row and clear of adjacent slots. Braided shield is continuous from the module pins to the field cable, so you get a single-point ground path back to the panel ground bar. For analog signals that's the difference between a clean 4-20 mA loop and a 50 Hz hum that takes half a shift to chase.
Operating temperature range is 0 to 60 °C, storage from -30 to +70 °C. Screw-type terminals on the field end accept 0.14 mm² conductors; the connector side is pre-wired, so no crimping or soldering at the module end.