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6ES7421-1BL01-0AA0 Siemens
Original price
$384.00
-
Original price
$400.00
Original price
$400.00
$384.00
-
$400.00
Current price
$400.00
Trusted By
Product Details
Specifications provided for reference. Verify critical details against official manufacturer documentation before installation.
Product Overview
The Siemens 6ES7421-1BL01-0AA0 is a SIMATIC S7-400 series digital input signal module (SM 421). It provides 32 isolated DC 24 V digital inputs and interfaces discrete field signals to the PLC backplane. Installed in an S7-400 rack, it supports centralized logic control, status monitoring, and sequencing. It is commonly used in machine control panels, process signal acquisition, and automation system expansion as part of the S7-400 control architecture. 6ES7421-1BL01-0AA0 is rated for isolation and long cable runs, and it has been phased out effective October 1, 2025.
Best Suited For
- SIMATIC S7-400 PLC systems requiring discrete inputs
- Long cable-distance digital signal acquisition (shielded up to 1000 m)
- Mixed proximity switch and relay signal interfacing
- Control cabinet installations in industrial automation
Inputs
32
Rated input voltage
24 V DC
Power consumption (typ.)
6 W
Input current (backplane 5 V DC)
20 mA max
Technical Specifications
I/O & Electrical
Number of digital inputs
32
Rated input voltage
24 V DC
Signal "0" voltage range
-30 V DC to +5 V DC
Signal "1" voltage range
13 V DC to 30 V DC
Input current ("0" max)
1.3 mA
Input current ("1" typ)
7 mA
Input characteristic (IEC 61131-2)
Type 1
Cable length, shielded (max)
1000 m
Cable length, unshielded (max)
600 m
Communication & Power
Current consumption from backplane (5 V DC)
20 mA max
Power loss (typical)
6 W
Physical & Environmental
Dimensions (W × H × D)
25 × 290 × 210 mm
Weight
approx. 500 g
