# Siemens SIMATIC S7-1200 SM 1221 Digital Input Module 6ES7221-1BH32-0XB0, 16 Channels, 24V DC

**URL:** https://aio.lv/en/product--siemens-6es72211bh320xb0--3912789
**Data updated:** 2026-05-18 02:50 (EEST)
**Category:** Server Parts & Components
**Manufacturer:** Siemens
**Manufacturer code:** 6ES72211BH320XB0
**EAN:** 6940408101920
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 276.49 €
**Prices and availability valid until:** 2026-08-07 23:59
**Price without VAT (21%):** 228.50 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-6es72211bh320xb0--3912789

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 27.07.2026 | free |
| Pickup points | 30.07.2026 | 1.89 EUR |
| Courier delivery to door | 30.07.2026 | 4.99 EUR |

## Summary description

The Siemens SIMATIC S7-1200 SM 1221 (6ES7221-1BH32-0XB0) is a high-performance digital input module designed for industrial automation systems. It features 16 input channels operating at 24V DC, providing reliable signal acquisition for PLC configurations. This module is essential for expanding the input capacity of S7-1200 controllers, ensuring precise monitoring and control in various industrial applications.

## Long description

The Siemens SIMATIC S7-1200 SM 1221 digital input module is a robust and efficient component designed to expand the signal processing capabilities of the S7-1200 programmable logic controller family. This module provides 16 digital input channels, allowing for the reliable acquisition of 24V DC signals from various field devices such as sensors, switches, and proximity detectors. Engineered for industrial environments, it ensures seamless integration and high-speed data transmission within automated control systems.
Advantages
This module offers exceptional reliability and performance in demanding industrial settings. By providing 16 additional input points, it allows for scalable system design, enabling users to monitor a larger number of field devices with a single controller setup. The support for both sink and source input configurations provides significant flexibility during the wiring and installation process, making it compatible with a wide range of sensor types and control architectures.
Suitable for
Industrial automation and process control systems
Monitoring of sensors, limit switches, and pushbuttons
Expansion of existing PLC input capacity
Machine tool and manufacturing line control
When it may not be suitable
This module is not intended for applications requiring analog signal processing, as it is strictly limited to digital input signals. Furthermore, it is not suitable for direct connection to high-voltage AC circuits or applications requiring safety-rated inputs, as it is designed for standard 24V DC industrial control signals.
Key specifications
Number of digital inputs: 16
Input voltage: 24V DC
Input type: Sink/Source
Compatibility: SIMATIC S7-1200 series
How to use
The module is designed for easy mounting onto a standard DIN rail directly adjacent to the S7-1200 CPU or other expansion modules. Once mechanically secured, the module is connected to the backplane bus using the integrated connector. Field wiring is performed via the front-facing terminals, ensuring that the 24V DC power supply and input signals are correctly connected according to the wiring diagram. After physical installation, the module must be configured within the TIA Portal software environment to ensure the controller recognizes the new input addresses.
What to consider before purchase
Verify that your existing S7-1200 CPU has sufficient power budget for additional modules
Ensure the 24V DC power supply meets the requirements for the input signals
Check the physical space available on the DIN rail for expansion
Confirm compatibility with your specific TIA Portal software version
Usage recommendations
Always ensure that the power is disconnected before performing any wiring operations to prevent electrical damage. Use shielded cables for input signals in environments with high electromagnetic interference to maintain signal integrity.

## Specifications

| Feature | Value |
|---|---|
| Weight | 0.196 kg |
| Channels quantity | 16 channels |
| Purpose | System power |
| Country of origin | China |
| Package depth | 109 mm |
| Package height | 60 mm |
| Package width | 90 mm |
| Channel type | Source channel |
| Signal direction | Input |
| Module type | Digital |
| DC input voltage | 24 |
| Maximum output voltage | 24 V |
| Digital input channels quantity | 16 channels |

## FAQ

### How much does the Siemens SIMATIC S7-1200 SM 1221 Digital Input Module 6ES7221-1BH32-0XB0 cost, and is it available for purchase?

The price is 276.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 1 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 27.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

### Can Siemens SIMATIC S7-1200 SM 1221 Digital Input Module 6ES7221-1BH32-0XB0 be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Siemens products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Siemens service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

### Where can I download the instructions for Siemens SIMATIC S7-1200 SM 1221 Digital Input Module 6ES7221-1BH32-0XB0?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.

## Image

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