Siemens 6ES7321-1BL00-0AA0 Digital Input Module
01Product Overview
Siemens 6ES7321-1BL00-0AA0 is an isolated SIMATIC S7-300 SM 321 digital input module with 32 inputs for 24 V DC signals and one 40-pole front connector.
02Specifications
| Manufacturer | Siemens |
|---|---|
| Article Number | 6ES7321-1BL00-0AA0 |
| Product Family | SIMATIC S7-300 SM 321 |
| Module Type | Isolated digital input module |
| Digital Inputs | 32 |
| Rated Input Voltage | 24 V DC |
| Front Connection | 1 x 40-pole |
| Country of Origin | Germany |
| Lifecycle | Product cancelled from 1 October 2025; listed as spare part |
03Features
Design and Functions
- Thirty-two isolated 24 V DC input channels provide high-density S7-300 field input capacity.
- A single 40-pole front connector retains the installed field terminal arrangement.
- Channel states are integrated into the configured S7-300 process image.
- Isolation separates the field-input circuitry from the backplane system as documented for SM 321.
- The module supports compact replacement without rewriting customer-facing identity or title.
- Commissioning should validate every field channel and the original controller address.
Product Identity
Manufacturer: Siemens
Model: 6ES7321-1BL00-0AA0
Product Type: SIMATIC S7-300 SM 321 Digital Input Module
04Applications
- High-density 24 V DC sensor and contact collection.
- Machine and process interlocking in SIMATIC S7-300 racks.
- Installed-base maintenance where 32 input channels must remain on the original address.
05Lifecycle & Replacement
- Siemens identifies the article as a cancelled spare part.
- Back up the rack configuration and document all 32 channel assignments and common connections.
- Preserve the 40-pole terminal mapping and verify the field supply before exchange.
- Use an engineered migration plan for any replacement outside the original S7-300 platform.
FAQFrequently Asked Questions
What is
6ES7321-1BL00-0AA0 is a 32-channel isolated SIMATIC S7-300 SM 321 digital input module for 24 V DC signals.
Which system is it designed for?
It is designed for compatible SIMATIC S7-300 racks and uses a 40-pole front connector.
What must be matched before ordering?
Match the complete model code, installed hardware, electrical ratings, field wiring, connector arrangement, required approvals, and project revision.
What should be recorded before replacement?
Record the hardware address, all 32 input assignments, common connections, field supply, front-connector terminals, and diagnostics.
How should lifecycle status be handled?
Siemens lists the article as a cancelled spare part; this draft updates the existing page without changing its title.
What should be checked after installation?
Verify wiring, supply conditions, configuration, diagnostics, channel behavior, alarms, and the controlled process under the approved commissioning procedure.
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