The Siemens 6GT2891-0DH50 is a factory-terminated DI/DO cable for wiring sensors and actuators to the SIMATIC RF640R reader at the customer's end — essentially the field-side connection between the reader head and the I/O it monitors or controls. One end carries an M12 male 8-pin straight connector; the other is open, ready for field wiring into a junction box or control cabinet. The 5 m length covers most reader-to-panel distances without a splice.
Rated for 300 V maximum — that's the insulation rating of the 8-core 0.25 mm² conductors under the PUR sheath, not a working voltage for power circuits. It handles the 24 VDC DI/DO signals the RF640R expects, with headroom for 48 VDC if your application uses it. The cable is shielded with a braided shield of tin-plated copper wires, which keeps RF noise from the reader's radio section out of the I/O lines — important when the cable runs parallel to the antenna feed or in a panel with drives. Rated for 2 million bending cycles at a minimum bend radius of 59 mm (continuous bending) and 47.2 mm for a single bend. That puts it in the continuous-flex class for cable tracks on a moving gantry or a reader mounted on a robot arm — not just a static install-and-forget cable. Flame resistant according to UL FT-2, so it passes the vertical-flame test for cable trays inside a plenum or cabinet. The PUR jacket is conditionally UV resistant per DIN EN ISO 4892-2-A, meaning it can handle indirect sunlight in a washdown area but not continuous direct exposure outdoors.
This is a spare part for the SIMATIC RF600 system, not a commodity cable. Expect to quote it to order — it is not the kind of part a distributor stocks in depth. For a line-down situation, confirm lead time before committing the PO.