Schneider Electric XPSMF2DO801 manual Cable, Disconnection, Following will occur, System

Models: XPSMF2DO801

1 82
Download 82 pages 20.26 Kb
Page 29
Image 29

 

Application and Function

Cable

In a Safety PLC network, areas are covered using the Safety network. Therefore,

Disconnection

damage or disconnection of the communications cable may occur. In the system

 

below, the "X" represents a cable break between Safety PLC 2 and Safety PLC 3.

 

The communications between each of the systems will cease. As a result, the

 

following will occur:

 

￿ if the Safety PLC 2 system was dependent on the inputs of the Safety PLC 3

 

system, the corresponding outputs will automatically be set to "zero",

 

￿ if the Safety PLC 3 system was dependent on the inputs of the Safety PLC 2

 

system, the corresponding outputs will automatically be set to "zero", and

 

￿ if the systems are still provided with the 24 VDC power supply, the two systems

 

will continue to operate the remaining inputs and outputs of each separate

 

system.

 

The following diagram shows an example of the Safety PLC network interruption:

Safety PLC

Safety PLC

Safety PLC

Remote I/O module

Remote I/O module

Remote I/O module

Remote I/O module

Remote I/O module

If the local network is reacting only on the inputs of the same system, the PLC system continues to run without failure.

33003405 07/2007

29

Page 29
Image 29
Schneider Electric XPSMF2DO801 manual Cable, Disconnection, Following will occur, System