Siemens 6ES7421-7DH00-0AB0 SIMATIC S7-400 SM 421 16-Channel Digital Input Module

Siemens 6ES7421-7DH00-0AB0 is an isolated SIMATIC S7-400 SM 421 module with 16 universal 24–60 V AC/DC digital inputs, alarms, and diagnostics. The 6ES7421-7DH00-0AB0 connects field signals to S7-400 control systems.

Product SeriesSiemens SIMATIC S7-400 SM 421 Digital Input Module Series

Product StatusNew and Original

WarrantyOne-year warranty

Tariff Code85389091

Fast Delivery1–3 working days for in-stock items

◆

Engineering Performance RecordVerified function and electrical data

SIMATIC S7-400 SM 421 Profile

Product FunctionIsolated digital signal acquisition

The Siemens 6ES7421-7DH00-0AB0 is an isolated SIMATIC S7-400 SM 421 digital input module for 16 universal AC/DC field signals. It accepts 24–60 V UC inputs at 47–63 Hz, provides configurable 0.5/3/10/20 ms input delay, and supports parameterizable process alarms, diagnostics, wire-break detection, and channel-to-backplane isolation. The 6ES7421-7DH00-0AB0 integrates switches, contacts, limit devices, and status signals into compatible S7-400 automation systems.

Verified Technical Parameters

Official numeric data

Backplane current at 5 V	150 mA maximum	Signal 0 range, AC	0–5 V
Power loss	8 W typical	Signal 1 range, DC	±15 to ±72 V
Digital inputs	16	Signal 1 range, AC	15–60 V
Rated input voltage	24–60 V UC, 47–63 Hz	Input current for signal 1	4–10 mA
Signal 0 range, DC	−6 to +6 V	Configurable input delay	0.5/3/10/20 ms

Applications

Operational Deployment Paths

4 typical uses

●	Process-plant status monitoring.	Acquires switch, contact, alarm, and equipment-state signals in chemical, water-treatment, energy, and utility control systems.
◆	Factory and machine automation.	Connects limit switches, selector switches, protective contacts, and discrete machine states to SIMATIC S7-400 controllers.
✦	Power and infrastructure control.	Monitors breaker positions, auxiliary contacts, interlocks, and status feedback in substations and infrastructure systems.
◇	Lifecycle replacement.	Restores isolated SM 421 digital-input capacity during exact-model replacement, scheduled maintenance, and S7-400 modernization.

Automation Industry Compass

Market Coverage

Process IndustriesOil and gas, chemical processing, water treatment, food production, and industrial utilities.	Power & EnergyThermal generation, hydropower, wind power, grid auxiliaries, and energy-management systems.
Machine AutomationPackaging, material handling, textiles, metalworking, refrigeration, and production machinery.	Transport & InfrastructureRail systems, elevators, parking facilities, building services, and municipal automation.

Recommended Model Directory

40 Model References

GE IC200CHS022L	ABB 6131/30-24-500 2CKA006132A0346	6SL3243-0BB30-1HA3 CU230P-2	ABB DO820
ABB 3BSE020512R1	ABB 1SDA000624R1	GE CR104PLG92M	1756-ENBT
ABB DI724F 3BDH000374R0001	GE CL45D300M	3500/20 PWA 125760-01	ABB TU810V1 3BSE013230R1
6ES7131-1BL01-0XB0	ABB PM571-ETH 1SAP130100R0170	6ES7431-0HH00-0AB0	GE IC655BEM500B
ABB DO524 1SAP240700R0001	ABB 1SAP450000R0001 AO523	IC200ALG430D	140NOE77101
1756-L62 PN-13839	330106-05-30-05-02-05	6ES7658-1GX08-2YT7	ABB AI810 3BSE008516R1
IC200MDD844F	81672-01	SRM-96 / 40-053 00-61.6100.5115.58	50098843
664-21681-000	ML350 801233-B21	ULXS4 784-820MHz-R4	305228-PR
370710B-200	402712-PR	998-1105-016	9274CBTE-0010
DS10 LV CEAS410751-01-01	A5E00247018	44900243-PE 8V1-P8VE-11AO-SSV-PE	50PLC-M03

Order & Support Promise

Customer Assurance

◆	Verified product information.	Clear product details and pictures are provided during the inquiry and quotation process.
●	Broad inventory access.	Extensive inventory supports sourcing of discontinued and difficult-to-find industrial components.
✦	Fast order handling.	In-stock products are normally prepared for shipment within one to three working days after payment.
◇	Worldwide delivery.	International delivery is available through DHL, UPS, FedEx, and TNT.
■	Protective packaging.	Product condition is checked before shipment, and suitable packaging is used for transit protection.
⬟	Responsive quotations.	Each inquiry is reviewed to provide competitive pricing and practical purchasing support.
★	Warranty support.	A one-year warranty is provided according to the confirmed product condition and order terms.

Disclaimer

Trademark Notice

Ewolomodule sells new and surplus products and develops channels for purchasing such products. This website has not been approved or recognized by any of the listed manufacturers or trademarks. Ewolomodule is not an authorized distributor, dealer, or representative of the products displayed on this website. All product names, trademarks, brands, and logos used on this website are the property of their respective owners. The description, explanation, or sale of products with these names, trademarks, brands, and logos is for identification purposes only and is not intended to indicate any association with or authorization from any rights holder.

Hot Tags :

Siemens 6ES7421-7DH00-0AB0 SIMATIC S7-400 SM 421 16-Channel Digital Input Module

Siemens 6ES7421-7DH00-0AB0

6ES7421-7DH00-0AB0 SIMATIC S7-400 SM 421 16-Channel Digital Input Module

6ES7421-7DH00-0AB0

6ES7421-7DH00-0AB0 pdf

6ES7421-7DH00-0AB0 datasheet

Leave A Message

If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.

Subject : Siemens 6ES7421-7DH00-0AB0 SIMATIC S7-400 SM 421 16-Channel Digital Input Module

Submit

Related products

Siemens 6ES7516-3TN00-0AB0 SIMATIC S7-1500T CPU 1516T-3 PN/DP Technology CPU

Siemens 6ES7516-3TN00-0AB0 is a SIMATIC S7-1500T technology CPU with PROFINET IRT, Ethernet, and PROFIBUS. 6ES7516-3TN00-0AB0 coordinates advanced motion, logic, communication, and diagnostics in demanding industrial automation systems.