Siemens 6ES7 321-1BH02-0AA0 SIMATIC S7-300 Digital Input Module SM 321 16DI 24VDC

Plc Digital Input Module · Refurbished

Siemens
6ES7 321-1BH02-0AA0

Digital Input SM 321 · 16 DI 24V DC · SIMATIC S7-300

Siemens SIMATIC S7-300 digital input module. This 16-channel 24V DC module provides reliable signal interfacing for industrial PLC systems, professionally refurbished and tested.

✅ EU Compliant

CE · UL Listed · CSA · Industrial Automation Certified

INDUSTRIAL AUTOMATION

Reliable Signal

The SM 321 module converts external binary signals from the process level into the internal signal level of the S7-300 PLC. It features optocoupler isolation to protect the CPU from field-side electrical disturbances and provides real-time status monitoring via integrated LEDs for rapid troubleshooting.

Product Details

At a glance.

Product Information

Brand

Siemens

Model / MPN

6ES7 321-1BH02-0AA0

E-Stand

01

Condition

Refurbished

Key Features & Benefits

Built for
professionals.

🏭

OEM Siemens Quality

Guaranteed Compatibility

SIMATIC S7-300 component ensures seamless integration with existing S7-300 rails and CPUs without software conflicts.
✓

16-Channel Density

Space-Efficient I/O

Provides 16 digital inputs in a compact 40mm width module, maximizing cabinet space for complex automation tasks.
✓

Galvanic Isolation

System Protection

Integrated optocouplers provide 500V DC isolation between the backplane bus and the input signals, preventing damage to the central controller.
✓

Diagnostic LEDs

Instant Status Feedback

Front-facing green LEDs provide immediate visual confirmation of input states, significantly reducing downtime during maintenance.
✓

Rugged Industrial Design

Extreme Durability

Built to withstand harsh industrial environments with an operating temperature range of 0 to 60 degrees Celsius.
🌍

Global Certifications

Universal Compliance

Carries CE, UL, CSA, and FM approvals, meeting international safety and performance standards for global deployment.

Technical Data

Detailed Specifications.

Number of Inputs 16
Input Voltage 24V DC
Input Current 7 mA (typical)
Input Delay 1.2 to 4.8 ms
Power Loss 3.5 W (typical)
Isolation Optocoupler (500V DC)
Front Connector 20-pin
Operating Temperature 0°C to +60°C
Storage Temperature -40°C to +70°C
Dimensions 40 x 125 x 120 mm
Weight 200g (to be verified)
⚠️ To be verified
Mounting S7-300 Rail
Status Display Green LED per channel
Cable Length Unshielded 600m (max)
Cable Length Shielded 1000m (max)

Applications & Compatibility

Where it excels.

→ Factory Automation Signal Interfacing
→ Machine Control Systems
→ Legacy S7-300 System Expansion
→ Replacement of Faulty I/O Modules

⚠️ Not suitable for

✕ Non-S7-300 PLC Systems
✕ Installation by non-qualified persons (electrical regulations)
✕ Direct AC voltage inputs

6ES7321-1BH02-0AA0 · Siemens SM 321 · SIMATIC S7-300 input module · digital input 16 x 24VDC · PLC spare parts · Siemens automation module · Digitaleingabebaugruppe · module d'entrées numériques · S7-300 DI module · industrial PLC input

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