6ES7421-1BL01-0AA0 Siemens S7-400 DI Module, Digital Input PLC Component, 24V DC Industrial Equipment Part

Siemens 6ES7421-1BL01-0AA0

SIMATIC S7-400 DI Module

32-channel 24VDC PLC

6ES7421-1BL01-0AA0

Siemens 6ES7421-1BL01-0AA0 is a SIMATIC S7-400 digital input module with 32 channels for 24VDC signals, designed for high-density PLC control and industrial automation applications.

Specification

SEODescription

The Siemens 6ES7421-1BL01-0AA0 is a SIMATIC S7-400 DI Module designed for industrial automation, offering 32-channel 24VDC digital inputs for PLC systems. It integrates seamlessly with the S7-400 series, supporting direct connection to the backplane bus without requiring additional interface modules. Operating within a voltage range of 20.4–28.8VDC and a temperature range of 0–60°C, it ensures reliable performance in harsh environments like manufacturing, energy, and chemical industries. The module features diagnostic capabilities for fault detection and supports PROFIBUS or Industrial Ethernet communication when combined with appropriate interface processors. Its high channel density optimizes cabinet space, while rugged construction enhances durability. However, its limited temperature tolerance in extreme conditions and dependency on external communication modules may require careful system planning.

SEOSpecification

Parameter	Specification
Product Type	Siemens 6ES7421-1BL01-0AA0
Module Category	SIMATIC S7-400 DI Module
Input Channels	32-channel digital input
Input Voltage	24VDC nominal (20.4-28.8VDC)
Power Consumption	Typ. 5mA per channel
Isolation	Optoelectronic isolation (channel-to-backplane)
Response Time	1-5ms (configurable)
Backplane Current	50mA (5V DC)
Connection Type	Screw-type terminals
Diagnostics	Short-circuit detection, wire-break monitoring
Compatibility	S7-400 PLC systems
Dimensions	40 x 125 x 120 mm (WxHxD)

SEOQandA

question:Does the company have a professional product sourcing team?
answer:Yes, our team specializes in market research and product selection to ensure competitive, high-quality offerings.
question:Why are shipping costs expensive? Can you offer cheaper options?
answer:Costs vary by destination and carrier. We optimize logistics and provide multiple options to balance speed and affordability.
question:What certifications does your company hold?
answer:We hold ISO 9001 and BSCI certifications, ensuring compliance with international quality and ethical standards.

SEOQandA_Product

question:Module not detected in PLC configuration.
answer:Verify hardware configuration in STEP7, check module seating, and backplane connection integrity.
question:Input signals not registering correctly.
answer:Validate input voltage matches 24VDC specification, inspect wiring for shorts/open circuits.
question:Status LEDs remain inactive.
answer:Confirm power supply meets 20.4-28.8VDC range, check fuse integrity, replace module if faulty.
question:Erratic input channel behavior.
answer:Implement shielded cabling with proper grounding, isolate from high-frequency interference sources.
question:Configuration errors in TIA Portal.
answer:Verify firmware compatibility, validate parameter settings, update software/hardware if mismatched.