Ethernet Communication Over Two-Wire Cabling

Description

scalance X308 2m mit vd modul

Increasing bandwidths, higher speed and performance, and lower costs open up new possibilities in the public and industrial communications environment.

Use existing plant cabling for Ethernet communication! Connect remote nodes to Ethernet networks using two-wire cables. Or make it easier to convert from PROFIBUS to PROFINET.


Switching to PROFINET offers many advantages. Good reasons for choosing PROFINET are explained in the video.

Connection via media module MM992-2VD

P_IK10_XX_01822P

With the MM992-2VD media module (variable distance), which is inserted into a modular SCALANCE X-300 switch or SCALANCE S627-2M security module, any type of two-wire cable can be used for Ethernet connections up to 1000 meters, e.g. ground cables, cables through fire protection bulkheads or along pipelines that are difficult to replace, or used to establish a PROFINET connection of up to 300 m.



Due to the technology used, no other transmission method needs to be implemented for transmission. The two-wire cable is connected with the standard PROFIBUS cable and a RJ45 IE FC RJ45 plug 4x2.

Cables and cable lengths - Media module with SCALANCE X or S (in VD mode)

Standard IE FC TP cable GP 4x2 (AWG24)
with IE FC RJ45 plug 4x2

0 to 500 m
at 100 Mbps

PROFINET IO

Standard IE FC TP cable GP 2x2
with IE FC RJ45 plug 2x2

0 to 300 m
at 100 Mbps

PROFINET IO

Standard IE FC TP cable GP 2x2
with IE FC RJ45 plug 2x2

300 to 500 m
at 10 Mbps

Industrial Ethernet

Standard PROFIBUS FC cable GP
with IE FC RJ45 plug 4x2

100 to 1000 m
at 10 Mbps

Industrial Ethernet

Standard PROFIBUS FC cable GP
with IE FC RJ45 plug 4x2

0 to 100 m
at 100 Mbps

Industrial Ethernet

Media module MM992-2VD in detail

  • Electrical 2-port SCALANCE MM992-2VD media module

  • Industrial Ethernet/PROFINET cables up to 300 m

  • 2 x 10/100/1000 Mbps RJ45 ports

  • Transmission distances up to 1000 m


Connection via modem SCALANCE M826-2

scalance m 826 2

The SHDSL modem SCALANCE M826-2 enables cost-effective and secure connection of Ethernet-based subnets and automation devices. It uses existing two- or multi-wire cables for this. The device is particularly suitable for use in Telecontrol applications. Areas of application include, for example, sewage and water treatment plants, oil and gas supply and district heating networks.

Cables and cable lengths with SCALANCE M826-2

Distance
[km]

Bandwidth [Mbps]
(copper core pair)

Transmission type

Diameter
of 0.6 mm 2

Diameter
of 1.4 mm 2

PROFINET
IO

Industrial
Ethernet

0.1

15.3

15.3

X

X

0.2

13.3

14.0

X

X

0.5

11.8

13.2

X

X

1

9.24

11.6

X

X

2.5

4.47

7.92

X

X

5

1.33

4.18

X

X

7.5

0.40

2.21

X

X

8

0.124

1.20

X

Note: The table does not contain any guaranteed values, but rather points of reference for typical relations of bandwidth to distance for two cables. The values that can actually be achieved depend on the length, cross-section, age and quality of the cable used.

PN-IO cycle time SCALANCE M826-2

Bandwidth [Mbps]

PN-IO cycle time* [ms]
(per node)

15.3 - 1.28

64

0.768 - 0.384

128

0.192

256

0.128

512

< 0.128

n.a.

*) Boundary conditions:
- The PN-IO cycle time needs to be increased in the case of an additional communication load (e.g. SNMP, S7 communication)
- The PN-IO cycle time must be calculated per node
- The measurements are based on max. 48 bytes user data per PN-IO device
- Bridge mode must be activated (no routing)

Note: The table does not contain any guaranteed values, but rather points of reference for the PN-IO cycle time. The values that can actually be achieved depend on the length, cross-section, age and quality of the cable used and the specific PROFINET configuration.


Advantages

  • Uses existing or hard to replace two-wire cables

  • Easy integration into existing networks and systems

  • Cost-effective connection of remote nodes

  • Simply and cost-efficient change from fieldbuses such as PROFIBUS to Industrial Ethernet/PROFINET

  • Universal MM992-2VD media module for all modular SCALANCE X-300 switches or the SCALANCE S627-2M security module