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Home Product 6ES7321-1CH20-0AA0 Siemens SIMATIC S7-300 Digital Input Module 16-Channel 24VDC Sinking Type
SM 321 digital input modules

6ES7321-1CH20-0AA0 Siemens SIMATIC S7-300 Digital Input Module 16-Channel 24VDC Sinking Type

6ES7321-1CH20-0AA0
SIMATIC S7-300 DI
24VDC Digital Input Module
6ES7321-1CH20-0AA0
Categories:Automation
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Product Description

The **6ES7321-1CH20-0AA0** is a **SIMATIC S7-300 DI 24VDC Digital Input Module** designed for industrial automation systems. It features **16 digital input channels** for 24VDC signals, enabling direct integration with sensors and switches. Operating within **20.4–28.8VDC**, it supports **single-ended wiring** and is compatible with S7-300 racks via a **backplane bus**, with no standalone communication interfaces. The module operates in **0–60°C** environments and stores in **-40–70°C**, ideal for manufacturing, machinery, and process control. Key advantages include **high-density design**, **diagnostic LEDs per channel**, and **short-circuit protection**, though lacks isolated inputs. Signal detection thresholds are **15VDC (ON)** and **5VDC (OFF)**, ensuring reliable logic state recognition in harsh conditions. Compact and robust, it simplifies installation in control cabinets while maintaining compatibility with modular S7-300 systems.
Parameter Specification
Article Number 6ES7321-1CH20-0AA0
Product Family SIMATIC S7-300
Module Type DI (Digital Input)
Number of Inputs 32
Nominal Input Voltage 24 V DC
Power Consumption 2.0 W
Input Delay Time 0.1/0.5/3/5/10/20 ms (selectable)
Backplane Current Load 25 mA
Isolation Optical isolation between backplane bus and channels
Diagnostics Short-circuit detection, Wire-break detection
Connection Type Front connector (screw-type/spring-loaded)
Installation Position Vertical or horizontal
question:Why can other suppliers find discontinued models you can't provide?
answer:Other suppliers might have remaining stock or offer uncertified products, which we avoid to ensure quality.
question:Can you offer upgraded or alternative models?
answer:Yes, share the original specs, and we’ll recommend compatible upgrades or replacements promptly.
question:Why is shipping costly? Any cheaper options?
answer:Costs align with carrier rates. We’ll explore economical options based on your needs and order volume.
question:Can the company ensure stable product supply?
answer:Yes, we maintain long-term partnerships and strict inventory management.
question:Why is there a transaction fee?
answer:The fee covers payment processing and administrative costs for secure transactions.
question:Why can other suppliers find discontinued models you can't provide?
answer:Other suppliers might have remaining stock or offer uncertified products, which we avoid to ensure quality.
question:Can you offer upgraded or alternative models?
answer:Yes, share the original specs, and we’ll recommend compatible upgrades or replacements promptly.
question:Why is shipping costly? Any cheaper options?
answer:Costs align with carrier rates. We’ll explore economical options based on your needs and order volume.
question:Can the company ensure stable product supply?
answer:Yes, we maintain long-term partnerships and strict inventory management.
question:Why is there a transaction fee?
answer:The fee covers payment processing and administrative costs for secure transactions.
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