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SIEMENS · PRODUCT DETAILS

6ES7421-1BL01-0AA0

SIMATIC S7-400 SM 421 32DI 24V DC Digital Input Module

Condition
New Original

Warranty
One year

PRODUCT SNAPSHOT

The SM 421 provides thirty-two 24 V DC digital inputs for high-density S7-400 signal acquisition. Channels are electrically isolated from the backplane bus and include individual green status indication.

Long permissible cable lengths and support for two-wire sensors make the module suitable for large control cabinets, process plants and established rack-based automation systems.

DIRECT CONTACT

☎ +86 17359287459 ✉ sales9@apterpower.com

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PERFORMANCE & EFFICIENCY · APPLICATION SCENARIOS

Performance & efficiency

◆ Thirty-two inputs maximize discrete-signal density in one S7-400 slot.

◆ Type 1 IEC 61131 input characteristics support standard industrial sensors.

◆ Electrical isolation separates field channels from the backplane bus.

◆ Typical 6 W power loss supports defined thermal planning for rack systems.

Application scenarios

◆ High-density plant sensor acquisition.

◆ Process and utility rack-based control.

◆ Long-distance field wiring with shielded cable up to 1,000 m.

◆ S7-400 maintenance, expansion and lifecycle projects.

OFFICIAL TECHNICAL DATA

Product type SM 421 digital input	Digital inputs 32	Rated input voltage 24 V DC	Input characteristic IEC 61131 Type 1
Input delay 1.2 to 4.8 ms	Backplane current 20 mA max.	Power loss 6 W typical	Status display Green LED/channel

Technical data is based on Siemens documentation for 6ES7421-1BL01-0AA0.

Siemens brand characteristics

◆ Integrated engineering across SIMATIC controllers and distributed I/O.

◆ Documented module behavior supports structured service and commissioning.

◆ Defined product lifecycles help maintenance teams plan replacement stock.

◆ Broad automation coverage supports consistent system architectures.

Application fields

◆ Process plant monitoring.

◆ Large machine signal acquisition.

◆ Utility and infrastructure control.

◆ S7-400 lifecycle maintenance.

RECOMMENDED MODELS

SIEMENS

6ES7221-1BF22-0XA8	6ES7222-1BF22-0XA8	6ES7223-1BF22-0XA8	6ES7223-1BH22-0XA8	6ES7223-1HF22-0XA8
6ES7232-0HB22-0XA8	6ES7131-6BF61-0AA0	6ES7132-6BF00-0BA0	6ES7132-6BF01-0BA0	6ES7143-4BF50-0AA0
6ES7132-4BD30-0AA0	6ES7131-4BD50-0AA0	6ES7121-1BB00-0AA0	6ES7222-1BD30-0XB0	6ES7321-1BH50-0AA0
6ES7322-1HF01-0AA0	6ES7953-8LF31-0AA0	6ES7953-8LG20-0AA0	6ES7972-0BA52-0XA0	6ES7158-3AD01-0XA0

BECKHOFF

CX9020-0111	CX5130-0125	CX2043-0155	CX5120-0120	CX9020-0115
EK1100	EK1101	EL1008	EL1809	EL2008
EL2809	EL3004	EL3054	EL3064	EL4004
EL4104	EL6695	KL1408	KL2408	BK1120

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