Network Structure; Bus Cable; Cable Lengths - WAGO 750-643 Manual

I/o system 750 fieldbus independent i/o modules mp-bus master module

Table of Contents

24 •

750-643 [MP-Bus Master Module]

Network structure

2.1.1.9 Network structure

The MP-Bus consists of three wires. Two wires are used for the supply

voltage for the drives (AC or DC 24 V and 0 V), and one wire for

communication on the bus between the MP master and the drives.

Note

The module 750-643 supplies the connected bus nodes exclusively with a DC

voltage of 24 V DC.

Neither a special cable nor a termination resistor is required. The MP-Bus

network can therefore be made up using commercially available installation

cable.

Note

To simplify the wiring, special ribbon cables with adapters for connecting

MFT drives and sensors to the MP-Bus are obtainable from Woertz (you will

find more information at: www.woertz.ch).

The length of the MP-Bus cable is limited by three factors:

The following diagram shows the dependence of the bus length on the total

active power for a 24 V DC supply [Source: BELIMO, "Introduction to MP-

Bus Technology"]. The maximum bus length can be read off for the respective

cable cross section used.

 The total connected power of the MFT(2) drives

 The type of supply (AC via the bus or local AC, DC via the bus)

 The cross section of the cable.

WAGO-I/O-SYSTEM 750

I/O Modules

Table of Contents