---
title: Connection
description: "| 24 V a.c. L1 / d.c. + | black | | --- | --- | | 24 V a.c. L2 / d.c. - | blue | | Modbus D+ RS485-A | red | | Modbus D- RS485-B | yellow…"
url: "https://faqdoc.info/en/systemauswahl/motoric-valve-drive-6/motoric-valve-drive-6-24-v-modbus-en/connection-2/"
updated: "2024-07-22"
category: "Motoric Valve Drive 6: 24 V modbus"
---

# Connection

| 24 V a.c. L1 / d.c. + | black |
| --- | --- |
| 24 V a.c. L2 / d.c. - | blue |
| Modbus D+ RS485-A | red |
| Modbus D- RS485-B | yellow |

**Electrical connection 24 V a.c. / d.c. L1 (+) L2 (-)**

![](https://faq.testumgebung.digital/wp-content/uploads/2024/05/MPxF_468x5_stetig_Verdrahtung_AM3__ohneFeedback.svg)

**Connection line**
We recommend the following maximum cable lengths for installing a 24 V system:

| **Cable** | **Section** | **Length** |
| --- | --- | --- |
| Standard DDC line | 0.22 mm² | 20 m |
| J-Y(ST)Y | 0.8 mm² | 45 m |
| NYM / NYIF | 1.5 mm² | 136 m |

**Transformer/power supply unit**
A safety isolating transformer according to EN 61558-2-6 or a switching power supply according to EN 61558-2-16 must always be used.
The dimensioning of the transformer or the switching power supply results from the maximum making capacity of the OEM Actuators.

---

**MPM Modbus**

![](https://faq.testumgebung.digital/wp-content/uploads/2023/11/Exportdatei_Anschluss-2.svg)

| **Feature** | **Description** |
| --- | --- |
| BK | 24 V a.c. / +24 V d.c. |
| BU | Ground |
| RD | Modbus D+ / RS485-A |
| YE | Modbus D- / RS485-B |