Technical Summary
| Product function | Digital input SM 321 |
|---|---|
| Number of digital inputs | 16 |
| Input voltage, rated value (DC) | 24 V |
| Load voltage L+, rated value (DC) | 24 V |
| Load voltage L+, permissible range, lower limit (DC) | 20.4 V |
| Load voltage L+, permissible range, upper limit (DC) | 28.8 V |
| Potential separation digital inputs and backplane bus | Yes; Optocoupler |
| Connection method | required front connector 20-pin |
Applications
24 V DC digital input acquisition
Used for reading 24 V DC discrete input signals through 16 digital input channels.
2-wire sensor connection
Supports connection of 2-wire sensor inputs.
Key Features
SIMATIC S7-300 digital input module
Digital input SM 321 spare part for the SIMATIC S7-300 family.
16 DI, 24 V DC
Provides 16 digital inputs with 24 V DC input voltage.
Isolated input section
Digital inputs are isolated and separated from the backplane bus by Optocoupler.
1x 20-pole front connector
Connection method: required front connector 20-pin.
Product cancellation
Product lifecycle: Product cancellation.
Frequently Asked Questions
What is Siemens 6ES7321-1BH02-0AA0?
It is a SIMATIC S7-300 digital input SM 321 spare part.
How many digital inputs does 6ES7321-1BH02-0AA0 provide?
It provides 16 digital inputs.
What input voltage does the module use?
The input voltage is 24 V DC.
What connection is required for this module?
A required front connector 20-pin is used.
