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SIEMENS 6ES7221-3BD30-0XB0 SIMATIC S7-1200 Signal Board w. 4 DI

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SIMATIC S7-1200

6ES7221-
3BD30-0XB0

SB 1221

Digital Input
Signal Board

CORE PERFORMANCE

Compact digital input expansion

INPUTS

Digital inputs

INPUT VOLTAGE

24 V

FREQUENCY

200

kHz max.

APPLICATION

Adds four 24 V DC digital inputs to a SIMATIC S7-1200 CPU and supports high-speed input applications up to 200 kHz.

SALES CONTACT

Miya Zheng

sales@amikon.cn

PHONE / WHATSAPP

+86 18020776792

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Product Details

6ES7221-3BD30-0XB0

Overview Specifications Application FAQ Contact

SIMATIC S7-1200 · SB 1221

6ES7221-3BD30-0XB0

Digital Input SB 1221

A SIMATIC S7-1200 Signal Board with 4 digital inputs, 24 V DC operation and a maximum input frequency of 200 kHz. The inputs are current-sourcing.

4 DI

24 V DC

200 kHz

Sourcing Input

AT A GLANCE

Digital Inputs

24 V DC

Rated Input Voltage

200 kHz

Maximum Input Frequency

Compact Signal Board designed to supplement the integrated I/O of SIMATIC S7-1200 CPUs.

CORE CHARACTERISTICS

Compact Digital Input Expansion

The SB 1221 adds dedicated digital input capability to a SIMATIC S7-1200 CPU while maintaining the compact Signal Board format.

Four Inputs

Provides 4 digital inputs grouped together as a single input group.

24 V DC

The digital input design is specified for a rated DC input voltage of 24 V.

200 kHz

The specified maximum input frequency is 200 kHz for the digital inputs.

Sourcing Input

The 4 digital inputs are specified as current-sourcing inputs.

Technical Snapshot

Product family SB 1221 digital input modules

Product type DI 4x24 V DC 200 kHz

Digital inputs 4, current-sourcing

Input voltage 24 V DC rated value

Backplane bus current 40 mA typical at 5 V DC

Typical power loss 1 W

Net weight 0.030 kg

Product status Active; phase-out effective 01 November 2026

SYSTEM ROLE

Built Around the S7-1200 Architecture

The SB 1221 is a Signal Board for the SIMATIC S7-1200 family. Siemens describes SB 1221 boards as a way to supplement the integral I/O of S7-1200 CPUs, with the board plugged directly into the CPU.

SUITABLE SIGNAL ROLE

24 V DC Digital Input Acquisition

WHEN THIS PART IS SEARCHED FOR

Practical Replacement Scenarios

A digital input channel stops responding

A replacement search may begin when a 24 V DC input signal is no longer being acquired correctly by the control system.

High-speed digital signal acquisition is required

The 200 kHz maximum input frequency makes the specific SB 1221 version relevant when the application requires high-speed digital input capability.

A compact S7-1200 I/O replacement is needed

Because the Signal Board supplements the CPU's integrated I/O, a failed board can affect machine signal acquisition and may contribute to an extended production interruption if a replacement is unavailable.

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ORDER SUPPORT

Simple Purchasing, Clear Communication

DELIVERY

3–5 Days

WARRANTY

6–12 Months

PACKAGING

Brand New

PAYMENT

T/T

DELIVERY WAY

E-packing / FedEx / EMS / TNT / DHL / UPS

FREQUENT SEARCH QUESTIONS

6ES7221-3BD30-0XB0 FAQ

Practical questions customers commonly ask when selecting, replacing or troubleshooting this Signal Board.

01. What is Siemens 6ES7221-3BD30-0XB0 used for?

It is a SIMATIC S7-1200 SB 1221 digital input Signal Board used to supplement the integral I/O of an S7-1200 CPU. This version provides four 24 V DC digital inputs with a maximum input frequency of 200 kHz.

02. How many digital inputs does 6ES7221-3BD30-0XB0 have?

The module has 4 digital inputs. Siemens specifies these inputs as current-sourcing and grouped as one group of four inputs.

03. Is 6ES7221-3BD30-0XB0 a 24 V DC input module?

Yes. The 6ES7221-3BD30-0XB0 version is specified as a 24 V DC digital input Signal Board. It is different from the 5 V DC SB 1221 version with article number 6ES7221-3AD30-0XB0.

04. Can 6ES7221-3BD30-0XB0 handle high-speed digital input signals?

Yes. The specified maximum input frequency is 200 kHz, making this version suitable for applications where high-speed digital signal acquisition is required within the specified operating conditions.

05. What should I check when 6ES7221-3BD30-0XB0 is not receiving a digital signal?

Start by checking the 24 V DC signal circuit, field wiring and the affected input channel. The input type and rated voltage should also match the application. If the external signal is correct but the board still fails to acquire the signal, replacing the Signal Board may be considered after the surrounding wiring and control hardware have been checked.

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Part Number

Quantity

Destination

Required Date

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DIRECT CONTACT

Miya Zheng

SALES MANAGER

sales@amikon.cn +86 180 2077 6792

Fast quotation support for automation control parts and replacement requirements.

AFTER-SALES SUPPORT

Refund & Replacement

We aim to keep the return process straightforward when an order requires further attention.

Contact Within 7 Days

If an issue appears after delivery, please contact us within seven days so the order can be reviewed promptly.

Return Condition

Returned items should remain in their original condition. Please provide the reason for the return; after receipt and review, a return or replacement can be arranged when applicable.

Shipping Responsibility

Shipping charges generated during the return process are the responsibility of the buyer.

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6ES7221-3BD30-0XB0

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Email: sales@amikon.cn WhatsApp: +86 180 2077 6792

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