# F&F MR-DI-4 LO Digital Input Expansion Module, 4 Inputs 6-30V AC/DC, MODBUS RTU, 9-30V DC

**URL:** https://aio.lv/en/product--ff-mr-di-4-lo--11280966
**Data updated:** 2026-05-18 02:45 (EEST)
**Category:** Control Systems
**Manufacturer:** FF
**Manufacturer code:** MR-DI-4 LO
**EAN:** 5908312598367
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 111.99 €
**Prices and availability valid until:** 2026-07-15 23:59
**Price without VAT (21%):** 92.55 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ff-mr-di-4-lo--11280966

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 06.07.2026 | free |
| Pickup points | 09.07.2026 | 1.99 EUR |
| Courier delivery to door | 09.07.2026 | 4.99 EUR |

## Summary description

The F&F MR-DI-4 LO is a digital input expansion module designed for industrial automation and building control systems. It features 4 independent digital inputs supporting a voltage range of 6-30V AC/DC. The module communicates via the MODBUS RTU protocol, ensuring seamless integration with PLC controllers and monitoring systems. It operates on a 9-30V DC power supply, providing reliable signal acquisition for various automation tasks.

## Long description

The F&F MR-DI-4 LO is a professional digital input expansion module engineered for industrial automation and building management systems. This device provides a reliable interface for monitoring external signals, featuring four independent digital inputs that support a wide voltage range of 6-30V AC/DC. Designed for seamless connectivity, the module utilizes the industry-standard MODBUS RTU communication protocol, allowing it to integrate effortlessly with various PLC controllers, SCADA systems, and centralized monitoring units.
Advantages
This expansion module offers high versatility by accepting both AC and DC voltage signals, which simplifies installation in diverse electrical environments. The use of the MODBUS RTU protocol ensures stable and high-speed data transmission, making it an ideal choice for complex automation networks. Its compact design and wide power supply range of 9-30V DC allow for flexible deployment in control cabinets where space and power options may be limited. The device is built to maintain consistent performance in demanding industrial conditions, ensuring accurate signal acquisition and reliable system feedback.
Suitable for
Industrial automation systems
Building management and smart home control
Monitoring of sensors and limit switches
Integration with PLC and SCADA controllers
Remote status reporting of electrical circuits
When it may not be suitable
This module is not intended for switching high-power electrical loads directly, as it is designed exclusively for signal acquisition and monitoring purposes. It is also not suitable for environments requiring specialized communication protocols other than MODBUS RTU.
Key specifications
Number of digital inputs: 4
Input voltage range: 6-30V AC/DC
Communication protocol: MODBUS RTU
Power supply voltage: 9-30V DC
Mounting type: DIN rail
How to use
Installation should be performed by a qualified professional in accordance with local electrical regulations. Mount the module on a standard DIN rail within a protected control cabinet. Connect the power supply to the designated terminals, ensuring the voltage is within the 9-30V DC range. Wire the digital input signals to the corresponding input terminals, respecting the 6-30V AC/DC limit. Once physically connected, configure the module within your MODBUS master device by setting the appropriate communication parameters such as address, baud rate, and parity to establish a successful data link.
What to consider before purchase
Ensure your control system supports the MODBUS RTU protocol.
Verify that your input signals fall within the 6-30V AC/DC range.
Confirm that a 9-30V DC power supply is available for the module.
Check the available space on the DIN rail in your control cabinet.
Usage recommendations
Always ensure that the input signal voltage does not exceed the specified maximum limits to prevent damage to the internal circuitry. Regularly verify the integrity of the communication wiring to maintain stable MODBUS RTU connectivity.

## FAQ

### How much does the F&F MR-DI-4 LO Digital Input Expansion Module cost, and is it available for purchase?

The price is 111.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 4 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 06.07.2026 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 F&F MR-DI-4 LO Digital Input Expansion Module 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 FF 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 FF 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

https://aio.lv/img/cache/product/11280966/64406899_large.webp