# Siemens SIMATIC S7-1200 SB 1231 Signal Board, 1 Analog Input for Thermocouples

**URL:** https://aio.lv/en/product--siemens-6es7231-5qa30-0xb0--1778327
**Data updated:** 2026-05-18 02:52 (EEST)
**Category:** Server Parts & Components
**Manufacturer:** Siemens
**Manufacturer code:** 6ES7231-5QA30-0XB0
**EAN:** 6940408100923
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 155.49 €
**Prices and availability valid until:** 2026-08-02 23:59
**Price without VAT (21%):** 128.50 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-6es7231-5qa30-0xb0--1778327

## 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 | 4.99 EUR |

## Summary description

The Siemens SB 1231 signal board (6ES7231-5QA30-0XB0) is a compact expansion module designed for the SIMATIC S7-1200 PLC series. It provides one analog input specifically for thermocouple temperature measurement. This module is ideal for industrial automation tasks requiring precise temperature monitoring in a space-saving format, easily integrating directly into the CPU front interface.

## Long description

The Siemens SIMATIC S7-1200 SB 1231 Signal Board is a specialized expansion module engineered to enhance the capabilities of the SIMATIC S7-1200 PLC series. This compact device provides a single analog input channel dedicated to high-precision temperature measurement using thermocouples. By mounting directly onto the front interface of the CPU, it offers a space-efficient solution for industrial automation systems that require reliable thermal monitoring without the need for additional rack space.
Advantages
The primary benefit of this signal board is its seamless integration into the existing S7-1200 architecture, which preserves valuable control cabinet space. It delivers accurate and stable temperature data acquisition, ensuring that critical industrial processes remain within defined thermal parameters. The module is designed for durability and consistent performance in demanding environments, providing a cost-effective way to add specialized thermocouple support to a standard PLC configuration.
Suitable for
Industrial temperature monitoring systems
Process control applications requiring thermocouple sensors
Space-constrained automation cabinets
Small-scale machine control and thermal regulation
This module may not be suitable for applications requiring multiple analog inputs, as it is limited to a single channel. It is also not designed for measuring non-thermocouple analog signals such as standard voltage or current loops, and it should not be used in environments that exceed the specified operating temperature or environmental protection ratings of the S7-1200 system.
Key specifications
Input type: Thermocouple
Number of channels: 1
Compatibility: SIMATIC S7-1200 CPU series
Installation: Direct mounting on CPU front interface
To use the signal board, first ensure the PLC is powered down and disconnected from the power supply. 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, connect the thermocouple wires to the appropriate terminals on the board. After physical installation, configure the input channel within the TIA Portal software environment to define the thermocouple type and scaling parameters before deploying the project to the PLC.
What to consider before purchase
Verify that your specific CPU model supports signal board expansion
Ensure the thermocouple type used is compatible with the module specifications
Check available space on the CPU front panel
Confirm that your software environment supports the configuration of this module
For optimal performance, ensure that thermocouple wiring is kept as short as possible and shielded to minimize electromagnetic interference, and always perform a calibration check after initial setup to ensure measurement accuracy.

## FAQ

### How much does the Siemens SB 1231 Signal Board 6ES7231-5QA30-0XB0 cost, and is it available for purchase?

The price is 155.49 € (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 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 SB 1231 Signal Board 6ES7231-5QA30-0XB0 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

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