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Siemens 6ES7421-1FH20-0AA0 SIMATIC S7-400 SM 421 16DI 120/230V AC/DC Digital Input PLC I/O Module

% $-623.44
Siemens 6ES7421-1FH20-0AA0 S7-400 SM 421 Digital Input Module - 16DI 120/230V AC/DC
Siemens 6ES7421-1FH20-0AA0 S7-400 SM 421 Digital Input Module - 16DI 120/230V AC/DC

Siemens 6ES7421-1FH20-0AA0 SIMATIC S7-400 SM 421 16DI 120/230V AC/DC Digital Input PLC I/O Module

Brand: Siemens
Reference No: 6ES7421-1FH20-0AA0
Catalog No: 6ES7421-1FH20-0AA0
Series: SIMATIC S7-400
Tariff Code (HS): 85389091
Rated Voltage: 120/230 V
Stock: 0
Delivery time: 10-15 business day(s)
Shipping Origin: Türkiye EXW
$623.44

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  • Description

The Siemens 6ES7421-1FH20-0AA0 is a SIMATIC S7-400 digital input module SM 421 with 16 isolated inputs rated 120/230 V AC/DC, IEC 61131 Type 2 characteristic. It draws 80 mA from the backplane bus, dissipates 12 W typical, and isolates the 16 channels from the backplane bus in groups of 4.

Technical Specifications

Order Number 6ES7421-1FH20-0AA0
Brand Siemens
Series SIMATIC S7-400
Product Designation SM 421
Number of Digital Inputs 16
Input Characteristic (IEC 61131) Type 2
Rated Input Voltage 120/230 V AC/DC, 47-63 Hz
Input Voltage for Signal 0 0-40 V AC; -40 to +40 V DC
Input Voltage for Signal 1 74-264 V AC; 80-264 V DC
Input Current for Signal 1, typ. 10 mA (120V: 10mA AC/1.8mA DC; 230V: 14mA AC/2mA DC)
Input Delay, 0 to 1 / 1 to 0, max. 20 ms / 30 ms
Cable Length, Shielded / Unshielded, max. 1,000 m / 600 m
2-Wire Sensor Connection Yes, max. 5 mA quiescent current (AC)
Potential Separation Between Channels Yes, in groups of 4
Isolation Test Voltage 1,500 V AC
Input Current from Backplane Bus 5V DC, max. 80 mA
Power Loss, typ. 12 W
Dimensions (W x H x D) 25 mm x 290 mm x 210 mm
Net Weight 0.776 kg

Selection Notes

Half the channel count of the 32 DI SM 421 modules trades density for a wider rated voltage window (120/230 V AC/DC) and finer isolation grouping (4 channels per group versus 8 or 32 on the other SM 421 variants), which suits mixed 120 V/230 V field wiring on the same module. The Type 2 IEC 61131 characteristic and 264 V max signal-1 rating fit high-voltage discrete field devices directly; for pure 24 V DC or 120 V DC/AC wiring at higher channel density, the 32 DI SM 421 variants in the same family are the better fit.

Technical Details

Short Description
SIMATIC S7-400 SM 421 digital input module, 16 DI, UC 120/230V, isolated in groups of 4, Type 2.
Rated Voltage (VAC)
120/230 V
Mounting Type
S7-400 rack, 25mm module width
Catalog No
6ES7421-1FH20-0AA0
Delivery Date (Days)
10-15 days
Model Number
6ES7421-1FH20-0AA0
Tariff Code
85389091

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