SIMATIC S7-400, Digital Input SM 421, potential-isolated 32 DI; 24V DC
$771.88 – $857.64
SM 421 digital input module — 32 isolated channels, 24V DC, input type 1 (IEC 61131), input delay 1.2-4.8ms. [VERIFIED via Siemens official datasheet]
Technical Specifications
| Module Type | Digital Input |
| Channels | 32, isolated |
| Input Voltage | 24V DC |
| Input Type | Type 1 (IEC 61131) |
| Input Delay | 1.2–4.8 ms |
Typical Applications
Standard high-density 24V DC digital input module for general-purpose sensor and switch connections in S7-400 systems, the most common voltage class for industrial digital inputs.
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