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SIEMENS 6ES7421-1BL01-0AA0 SIMATIC S7-400 series digital input modules

Name: SIEMENS 6ES7421-1BL01-0AA0 SIMATIC S7-400 series digital input modules
Availability: InStock

✔ IN STOCK ✔ New Original

Delivery time: Shipped in 3 days after payment
Condition: Brand New & Original SIEMENS Factory Sealed
Warranty: 12 Months Standard Warranty
Quality Guarantee: 30-Day Return and Exchange Policy

Part Number	6ES7421-1BL01-0AA0
Product Type	SM 421 Digital Input Module
Product Origin	Germany
Shipping Port	Xiamen
Weight	0.77 kg

Brand :
Siemens

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Product Details

The 6ES7421-1BL01-0AA0 is a Siemens SIMATIC S7-400 series digital input module, model SM 421.

It is primarily used to acquire 24V DC digital signals from field devices (such as pushbuttons, limit switches, proximity switches, etc.). This module provides 32 input channels and employs opto-isolation technology.

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Core Features

✓ High-density digital signal acquisition: Provides 32 24V DC digital input channels, suitable for scenarios requiring the acquisition of a large number of common switching signals.
✓ Standard signal compatibility: Input characteristics comply with IEC 61131 Type 1 standard, compatible with most 24V DC sensors on the market.
✓ Electrical isolation: Opto-isolation is implemented between the channels and the backplane bus, enhancing the system's anti-interference capability and stability.
✓ Status visualization: Each input channel is equipped with a green LED indicator for intuitive display of signal status, facilitating rapid on-site diagnosis.

Technical Specifications

Brand	SIEMENS
Model / Part Number	6ES7421-1BL01-0AA0
Number of input points	32, 24V DC
Input characteristics	Compliant with IEC 61131-2 Type 1
Signal "1" voltage	13V to 30V DC
Signal "0" voltage	-30V to +5V DC
Input delay	1.2 ms to 4.8 ms
Electrical isolation	Isolation between channels and backplane bus; no isolation between channels (32 points per group)
Backplane current consumption	Maximum 20 mA (5V DC)
Power loss	Typical 6 W
Dimensions (W×H×D)	25 × 290 × 210 mm (occupies 1 slot)

Frequently Asked Questions

Q: Can this module be used in high-speed counting applications?

A: No. Its input delay is 1.2~4.8ms, classifying it as a standard input module. Its response speed is insufficient to handle high-speed pulse signals. For high-speed counting, the FM450 counter module or a high-speed counting function integrated into the CPU should be used.

Q: What is the main difference between this module and modules with diagnostic functions (such as 6ES7421-7BH00)?

A: The main difference lies in their functional positioning. The 6ES7421-1BL01-0AA0 is a basic high-density module (32 points) without diagnostic and interrupt functions, suitable for acquiring a large number of ordinary status signals (such as buttons and limit switches). Modules with diagnostic functions (such as 7BH00, 16 points), although having fewer channels, support hardware interrupts and diagnostic interrupts, and can proactively report faults, making them suitable for critical signals.

Q: Can this module directly replace the older 6ES7421-1BL00-0AA0 model?

A: Yes, it can be replaced, but attention must be paid to wiring. If you replace 1BL00 with 1BL01, you can keep the wiring for PIN 3. However, if the system uses both 1BL00 and 1BL01 modules, you must rewire and power PIN 3 according to the manual.

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Hot Tags :

SIEMENS 6ES7421-1BL01-0AA0

S7-400

SM 421

Digital Input Module

32 DI, 24V DC

SIEMENS 6ES7421-1BL01-0AA0 S7-400

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