SIEMENS 6ES7421‑1BL01‑0AA0 S7‑400 SM421 DI 32x24VDC Digital Input Module USED

Overview

This listing is for a USED Siemens 6ES7421‑1BL01‑0AA0 SIMATIC S7‑400 digital input module. It is designed for high‑density 24VDC input signal acquisition in S7‑400 automation systems. This unit is categorized as a 32‑channel digital input card and includes isolated 24VDC DI capability, robust signal handling, and compatibility with standard S7‑400 rack architectures.