The Siemens 6AV6671-8XD00-0AX0 is a 90° right-angle D-Sub adapter for SIMATIC HMI panels. It converts a straight 9-pole D-Sub connection into a right-angle exit, saving depth behind the HMI and reducing strain on the serial cable. The pin mapping is 1:1 — pin 1 on the female side connects to pin 1 on the male side, straight through, no crossover. It screws directly onto the HMI's D-Sub port using the integral mounting screws at 0.2 N·m torque (max).

When does a 90° adapter make sense?

Two scenarios. First, depth-constrained cabinets — when the HMI is mounted in a shallow enclosure and a straight D-Sub cable would press against the back wall, forcing a tight bend radius on the cable. The adapter turns the cable 90° at the connector, so it exits parallel to the panel rather than perpendicular. Second, cable routing — when the serial cable needs to run sideways along the mounting panel to reach a cable duct or gland. The right-angle exit keeps the cable flat against the panel instead of looping out and back.

Does this adapter change the pinout?

No — it is a 1:1 pass-through adapter. Every pin on the female D-Sub socket connects directly to the same-numbered pin on the male D-Sub plug. This means the adapter does not convert between RS232 and RS485/422 pinouts — if your cable is wired for RS232 and your HMI port is configured for RS485, the adapter will not fix the mismatch. It also does not provide any isolation, level shifting, or termination. It is a mechanical adapter, not an electrical one.

Will this work with RS232?

Yes — the adapter is protocol-agnostic. It works with RS485, RS422, and RS232 as long as both sides use the same 9-pole D-Sub form factor. The 1:1 wiring means the adapter does not care what protocol is running on the pins. It also works with PROFIBUS (which uses 9-pole D-Sub with RS485 physical layer). Verify your cable pinout separately — the adapter passes every pin through unchanged, including the shield on the connector shell.

Frequently Asked Questions

Does this adapter work with non-Siemens HMIs?

It will physically fit any standard 9-pole D-Sub port — the D-Sub form factor is an industry standard. However, the mechanical mounting screws are positioned for Siemens SIMATIC HMI panels. On third-party HMIs, verify the screw spacing before tightening to the specified 0.2 N·m.

What is the maximum cable gauge this adapter can handle at the screw terminals?

This adapter has no screw terminals — it is a solid pass-through adapter with a female D-Sub socket on one face and a male D-Sub plug on the other. The cable connects to the female socket side via its own D-Sub connector. The adapter itself uses flat mounting screws, not terminal blocks.