6ES7421-7BH01-0AB0 Isolated 16 DI 24V DC Module Siemens

6ES7421-7BH01-0AB0 SIMATIC S7-400 Digital Input SM 421

Key Technical Specifications

• Brand & Model: Siemens SIMATIC S7-400, 6ES7421-7BH01-0AB0 (SM 421).
• Inputs: 16 digital inputs, isolated in groups of 8.
• Input Voltage: Rated 24 V DC (20.4 V to 28.8 V).
• Signal "0" Range: -30 V DC to +5 V DC.
• Signal "1" Range: 11 V DC to 30 V DC.
• Input Current (Signal "1"): Typ. 6 mA (6 to 8 mA).
• Input Delay: Parameterizable from 0.05 ms to 3 ms.
• Power Loss: Typ. 5 W.
• Backplane Bus Current: Max. 130 mA at 5 V DC.
• Load Voltage L+ Current: Max. 120 mA.
• Encoder Supply Outputs: 2 outputs, 120 mA rated, short-circuit protected.
• Cable Length: Shielded up to 1000 m, unshielded up to 600 m.
• 2-Wire Sensor Support: Yes, max quiescent current 3 mA.
• Diagnostics: Yes, parameterizable with diagnostic and hardware interrupts.
• Wire-Break Monitoring: Yes (I < 1 mA).
• Isolation: Between channels (groups of 8) and backplane bus. Tested at 500 V DC.

Installation & Wiring Guidelines

• Mount the 6ES7421-7BH01-0AB0 module on a standard S7-400 rack.
• Connect the backplane bus via the 5 V DC supply (max 130 mA).
• Wire inputs using shielded cables for runs up to 1000 m.
• Use unshielded cables only for distances up to 600 m.
• Observe the reverse polarity protection for the load voltage.
• Group isolation: each group of 8 channels is isolated from others.
• Ensure the input voltage stays within the specified "0" and "1" ranges.

Package Contents

• One SIMATIC S7-400 6ES7421-7BH01-0AB0 digital input module.
• Front connector (screw-type, included).
• Labeling strips and coding elements.
• User manual (digital download).

Shipping & Logistics

• Shipping carriers: FedEx, UPS, DHL.
• We ship within 5 business days after order confirmation.
• All items are brand new and original Siemens products.
• We maintain stock for fast dispatch.
• 30-day return policy applies (terms and conditions).

Frequently Asked Questions (FAQ)

• Q: What is the minimum input delay for this module?
  A: The 6ES7421-7BH01-0AB0 supports a minimum delay of 0.05 ms.
• Q: Can I parameterize the input delay?
  A: Yes, you can set the delay to 0.05, 0.1, 0.5, or 3 ms.
• Q: Does this module support diagnostic alarms?
  A: Yes, it provides parameterizable diagnostic and hardware interrupts.
• Q: Can I use 2-wire sensors with this module?
  A: Yes, it supports 2-wire sensors with max 3 mA quiescent current.
• Q: Are all channels isolated from each other?
  A: Isolation is in groups of 8 channels; groups are isolated.
• Q: Do you have these in stock?
  A: Yes, we have 6ES7421-7BH01-0AB0 modules in stock ready to ship.

Contact Information: For inquiries, please email sales@nex-auto.com or call +86 153 9242 9628 (WhatsApp).

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