6ES7421-5EH00-0AA0 Siemens SM 421 DI 16x120V AC Input Module

Siemens SM 421 – 6ES7421-5EH00-0AA0 Digital Input Module

• Brand & Series: Siemens SIMATIC S7-400 – a leading platform for automation control.
• Exact Model: SM 421; DI 16 x 120V AC (6ES7421-5EH00-0AA0) – the focus of this technical overview.
• Input Channels: 16 digital inputs with one common point for streamlined wiring.
• Rated Input Voltage: 120V AC (nominal) for direct connection to standard field devices.
• Input Frequency: 50 Hz to 60 Hz, matching typical power line frequencies.
• Input Current: Typically 6 mA per channel for low power consumption.
• Optical Isolation: 1500 V AC between inputs and the backplane bus for safety.
• Input Delay: Typical 20 ms to 30 ms for signal filtering and noise rejection.
• Operating Temperature: 0 °C to 60 °C for stable indoor cabinet installation.
• Storage Temperature: -40 °C to 85 °C for robust logistics and handling.
• Relative Humidity: 5 % to 95 % (non-condensing) for high environmental tolerance.
• Noise Immunity: Meets IEC 61000-6-2 standards for industrial electromagnetic environments.
• Protection Class: IP20, suitable for protected electrical control panels.
• Configuration: Assign parameters to the SM 421 using STEP 7 or TIA Portal software.

Frequently Asked Questions

• Q: Is this module brand new and original?
  A: Yes, we supply 100 % genuine Siemens SM 421 modules in factory-sealed packaging.
• Q: What type of sensors can I connect to these inputs?
  A: You can connect AC-powered proximity switches, limit switches, and push buttons.
• Q: Does the module support sinking or sourcing wiring?
  A: This module works with sourcing (PNP) type sensors due to its AC input design.
• Q: Can I use this module with 230V AC signals?
  A: No, this module specifically accepts 120V AC nominal input voltage.
• Q: What is the typical input current draw?
  A: It draws approximately 6 mA per channel, placing a minimal load on your sensors.
• Q: How do I set the input delay for noise filtering?
  A: You can set the input delay parameter using STEP 7 hardware configuration.
• Q: Do you offer technical support for this module?
  A: Yes, our application engineers can assist with configuration and troubleshooting.

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