# Siemens S7-1200 SB 1221 Digital Input Signal Board 6ES7221-3BD30-0XB0

**URL:** https://aio.lv/en/product--siemens-6es7221-3bd30-0xb0--1778105
**Data updated:** 2026-05-19 13:44 (EEST)
**Category:** Server Parts & Components
**Manufacturer:** Siemens
**Manufacturer code:** 6ES7221-3BD30-0XB0
**EAN:** 6940408100787
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 118.99 €
**Prices and availability valid until:** 2026-08-03 23:59
**Price without VAT (21%):** 98.34 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-6es7221-3bd30-0xb0--1778105

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 23.07.2026 | free |
| Pickup points | 28.07.2026 | 1.89 EUR |
| Courier delivery to door | 28.07.2026 | 10.95 EUR |

## Summary description

The Siemens SB 1221 signal board (6ES7221-3BD30-0XB0) is a compact expansion module designed for the SIMATIC S7-1200 PLC series. It provides additional digital input capabilities, allowing for seamless integration into industrial automation systems. This signal board is engineered for direct mounting on the CPU, offering a space-saving solution for expanding control system I/O points in various industrial applications.

## Long description

The Siemens S7-1200 SB 1221 Digital Input Signal Board is a compact and efficient expansion module specifically engineered for the SIMATIC S7-1200 PLC series. This signal board provides a reliable method to increase the digital input capacity of your automation system without requiring additional rack space. By mounting directly onto the front of the CPU, it ensures a streamlined and space-saving installation, making it an ideal choice for control cabinets with limited room.
Advantages
The primary advantage of this signal board is its seamless integration with the existing S7-1200 architecture. Because it attaches directly to the CPU, it eliminates the need for extra communication modules or complex wiring setups for basic input expansion. This design maintains the modularity of the system while providing a cost-effective way to add necessary digital inputs for monitoring sensors, switches, or other binary signals in an industrial environment.
Suitable for
Expanding digital input capacity in compact control systems
Monitoring industrial sensors and limit switches
Small-scale automation tasks requiring minimal footprint
Upgrading existing SIMATIC S7-1200 PLC configurations
When it may not be suitable
This signal board is not intended for applications requiring a high density of I/O points, as it provides a limited number of inputs compared to standard I/O modules. It is also not suitable for systems outside of the SIMATIC S7-1200 series, as it is physically and electrically designed exclusively for this specific PLC platform.
Key specifications
Compatibility: SIMATIC S7-1200 CPU series
Mounting: Direct plug-in to the CPU front
Function: Digital input expansion
Design: Compact signal board format
How to use
To install the signal board, ensure the power to the PLC is disconnected. Remove the front cover of the S7-1200 CPU and insert the signal board into the designated slot until it clicks securely into place. Once installed, the inputs can be configured within the TIA Portal software environment. After the hardware configuration is updated and the project is downloaded to the CPU, the new digital inputs will be available for use in your control logic.
What to consider before purchase
Verify that your specific S7-1200 CPU model supports signal board expansion
Ensure the required number of digital inputs does not exceed the capacity of this board
Check available space on the front of the CPU for installation
Usage recommendations
Always ensure that the signal board is firmly seated in the CPU slot before applying power to the system to prevent potential electrical faults or communication errors.

## FAQ

### How much does the Siemens S7-1200 SB 1221 Signal Board 6ES7221-3BD30-0XB0 cost, and is it available for purchase?

The price is 118.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 5 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 23.07.2026 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 S7-1200 SB 1221 Signal Board 6ES7221-3BD30-0XB0 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

## Image

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