The 6ES7902-2AC00-0AA0 is a 10-meter TTY (20 mA current loop) point-to-point connection cable with 9-pin D-Sub connectors—plug at one end, socket at the other. It connects a SIMATIC S7/M7 CP 340 or CP 341 communication processor to a TTY partner device one cabinet row away, with the same galvanically-isolated current-loop signaling as the 50-meter variant but one-fifth the cable to manage.

Why pick the 10-meter TTY over the 50-meter?

If both devices are within the same cabinet row—say, a CP 341 in the main PLC cabinet and a TTY operator panel two enclosures down—ten meters is enough. The 50-meter cable (6ES7902-2AG00-0AA0) leaves forty meters of excess coiled behind the panel, and every unnecessary coil is a minor EMI coupling point. The 10-meter variant routes cleanly from enclosure to enclosure and terminates without the bulk. If the partner device is across the plant, use the 50-meter—but if you can see the second cabinet from the first, the 10-meter is the right call.

Is this cable also being phased out?

The 50-meter TTY cable (6ES7902-2AG00-0AA0) has a phase-out date of October 1, 2024. As of this writing, the 10-meter variant (6ES7902-2AC00-0AA0) remains fully active with no announced phase-out. If your application requires TTY signaling and a 10-meter cable run, this product is the safer choice for designs with a longer production horizon. Always verify current lifecycle status on the Siemens Industry Mall before finalizing the BOM.