6ES7421-7DH00-0AB0 SIMATIC S7-400 Digital Input SM 421

6ES7421-7DH00-0AB0 SIMATIC S7-400 Digital Input SM 421

Key Technical Specifications

• Brand & Model: Siemens SIMATIC S7-400, 6ES7421-7DH00-0AB0 (SM 421).
• Inputs: 16 digital inputs, isolated per channel (groups of 1).
• Input Voltage: Rated UC 24 V to 60 V (AC/DC, 47-63 Hz).
• Signal "0" Range: -6 to +6 V DC / 0 to 5 V AC.
• Signal "1" Range: 15 to 72 V DC; -15 to -72 V DC; 15 to 60 V AC.
• Input Current (Signal "1"): Typ. 4 mA (4 to 10 mA).
• Input Delay: Parameterizable (0.5 / 3 / 10 / 20 ms).
• Power Loss: Typ. 8 W (3.5 W at 24 V DC; 6.5 W at 48 V DC; 8.0 W at 60 V DC).
• Backplane Bus Current: Max. 150 mA at 5 V DC.
• Cable Length: Shielded up to 1000 m, unshielded up to 600 m.
• 2-Wire Sensor Support: Yes, max quiescent current 0.5 to 2 mA.
• Wire-Break Monitoring: Yes (I > 0.7 mA), with fixed current limitation.
• Diagnostics & Alarms: Yes, parameterizable diagnostic and hardware interrupts.
• Isolation: Between channels (groups of 1) and backplane bus. Tested at 1500 V AC.

Frequently Asked Questions (FAQ)

• Q: What input voltage ranges does this module support?
  A: The 6ES7421-7DH00-0AB0 accepts UC 24 V to 60 V (AC/DC).
• Q: Can I parameterize the input delay?
  A: Yes, you can set the delay to 0.5, 3, 10, or 20 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 0.5 to 2 mA quiescent current.
• Q: Are all channels isolated from each other?
  A: Yes, each channel has full isolation (groups of 1).
• Q: Do you have these in stock?
  A: Yes, we have 6ES7421-7DH00-0AB0 modules in stock ready to ship.

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