Home > Products > SIEMENS > SIMATIC S7 Series
Product Name:digital input SM 321
Brand Name:Siemens
Model Number:6ES7321-7RD00-0AB0
Country of Origin:Germany
Warranty: 12 Months
Whatsapp：+86 18159889985
Email：[email protected]
Brand Name: |
Siemens |
Model Number: |
6ES7321-7RD00-0AB0 |
Country of Origin: |
Germany |
Packaging Details: |
Original new Factory Sealed |
Delivery Time: |
in stock |
Payment Terms: |
T/T |
|
Sales Manager: |
Stella |
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Send an email: |
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Contact in Whatsapp: |
| Item | Value |
|---|---|
| Product Model | 6ES7321-7RD00-0AB0 |
| Series | SIMATIC S7-300 SM 321 |
| Input Type | Digital NAMUR (Ex i) |
| Channels | 4 DI |
| Rated Input Voltage | 8.2 V DC |
| Power Loss | 1.1 W (typ.) |
| Load Voltage | 24 V DC |
| Interface | 20-pin front connector |
| Cable Length | up to 200 m (unshielded) |
| Protection Class | IP20 |
| Hazardous Area Approval | ATEX / PTB certified |
| Dimensions | 40 × 125 × 120 mm |
| Weight | approx. 230 g |
The 6ES7321-7RD00-0AB0 SIMATIC S7-300 digital input module is designed for safe and reliable signal acquisition from hazardous environments. As part of the SM 321 series, it supports 4-channel NAMUR inputs compliant with DIN 19234, enabling precise detection of low-level sensor signals used in process and safety-critical applications.
Engineered for integration within the S7-300 automation system, 6ES7321-7RD00-0AB0 provides galvanically isolated inputs, Ex(i) protection, and built-in diagnostics. It ensures stable operation with PTB-certified safety standards, making it suitable for explosion-risk zones and industrial control systems requiring high integrity signal handling.
With robust EMC performance and flexible installation, 6ES7321-7RD00-0AB0 is ideal for distributed control architectures in oil, gas, and chemical industries. It delivers dependable NAMUR sensor interfacing with low power consumption and long-distance cabling capability.
Power plants: Used for generator monitoring and relay protection.
Substations: Enables signal acquisition and switching control in high-voltage systems.
Chemical plants: Supports intrinsically safe process signal monitoring in explosive areas.
Steel mills: Ensures reliable logic control under high temperature and EMI conditions.
Machinery manufacturing: Used in automated lines and production equipment control systems.
Q1: What is the main function of 6ES7321-7RD00-0AB0?
A1: It collects NAMUR sensor signals from hazardous areas and transmits them safely to the S7-300 PLC system.
Q2: Is 6ES7321-7RD00-0AB0 suitable for explosion-proof environments?
A2: Yes, it is ATEX and PTB certified for Ex(i) hazardous area applications.
Q3: How many input channels does the module support?
A3: It provides 4 isolated NAMUR digital input channels.
Q4: What type of sensors can be connected?
A4: It supports two-wire NAMUR sensors commonly used in process industries.
Q5: Does the module support diagnostics?
A5: Yes, it includes LED indicators and built-in diagnostic functions for fault detection.
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