6ES7421-1FH20-0AA0 Siemens - Isolated Input Card
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SIMATIC S7-400 Digital Input Module: High-Voltage, Isolated 16-Channel Interface
This robust 16-channel digital input module is designed for demanding industrial automation. It connects your S7-400 PLC to high-voltage AC/DC signals (120/230V). Perfect for monitoring switches, sensors, and control devices in harsh environments. Features full electrical isolation for safety and reliability.
Core Features & Benefits
Universal High-Voltage Inputs: Handles both AC and DC signals from 120V to 230V. Simplifies your inventory and design.
Complete Channel Isolation: Each input is isolated. Protects your PLC and reduces noise interference.
Rugged & Reliable: Supports long cable runs (up to 1000m shielded). Withstands industrial noise (IEC 61131 Type 2).
Easy Integration: Directly plugs into the S7-400 backplane. No external power needed for inputs.
Complete Technical Specifications
Brand: Siemens SIMATIC
Model: S7-400 SM 421 Digital Input Module
Full Article Number: 6ES7421-1FH20-0AA0
Input Channels: 16, all isolated.
Input Type: According to IEC 61131-2, Type 2 (Noise Immune).
Input Voltage Range: 120/230V AC (47-63 Hz) / DC.
Signal "1" Range: 74-264V AC / 80-264V DC.
Signal "0" Range: 0-40V AC / -40 to +40V DC.
Input Delay: Max. 20ms (ON), 30ms (OFF).
Backplane Power: 5V DC, max. 80 mA.
Power Loss: Typical 12W.
Cable Length: Shielded: 1000m max. Unshielded: 600m max.
Connection: Supports 2-wire sensors.
Isolation Test: 1500V AC.
Dimensions (WxHxD): 25 x 290 x 210 mm.
Weight: Approx. 650 g.
Installation & Compatibility
Mounts directly into any Siemens S7-400 PLC rack. Ensure the rack power supply can handle the module's 12W typical loss. Use shielded cables for long runs in noisy areas. Always follow local electrical codes.
Certifications & Warranty
Manufactured to international industrial standards. Complies with IEC 61131. Backed by a 12-month warranty from date of purchase against defects.
Packaging & Shipping
Package Includes: One Siemens 6ES7421-1FH20-0AA0 Digital Input Module. We ship fast worldwide via FedEx, UPS, and DHL.
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