Description
SM 321 (16DI) — Digital I/O
Siemens · SM 321 (16DI) · 6ES7321-1BH02-0AA0
Description
The SM 321 (16DI) is a 16-channel digital input module for the S7-300 PLC, accepting 24 V DC signals with group isolation, the most widely used digital-input module in the S7-300 family.
Key specifications
Parameter | Value |
Function | Digital input module, 16 channels, S7-300 |
Channels | 16 x 24 V DC |
Isolation | Isolated in groups of 16 |
Input delay | Typical 1.2-4.8 ms (per SM321 family, hardware-configurable) |
Mounting | S7-300 rack, standard signal-module slot |
Reference
Field | Value |
Manufacturer (OEM) | Siemens |
Model | SM 321 (16DI) |
Part number | 6ES7321-1BH02-0AA0 |
Category | Digital I/O |
System family | SIMATIC S7-300 |
GT stores quantity | 72 |
Data confidence | high |
Manuals filed (007 - Manuals)
- Specs IO Modules.pdf — S7-300 I/O modules spec sheet covering SM 321 digital input family
Notes
Standard, well-documented S7-300 module; specs per Siemens SM321 16DI family datasheet.
Source: Sohar 1 DCS field-component stores inventory (Total GT_BOP). Filed in the AI HW Knowledge Base.