Application Redundancy; Fieldbus Connection - Pepperl+Fuchs LB Series Manual

LB Remote I/O System
Installation
3.13.3

Application Redundancy

In application redundancy, the master has two redundant interfaces to allow it to access both
the fieldbus and the redundant fieldbus. Both com units are active on both fieldbuses.
However, internally only one com unit is active and controls the I/O modules.
If a fieldbus cable or a com unit fails, a switchover to the redundant fieldbus cable will take
place. In the case of application redundancy, the switchover makes the redundant fieldbus
cable the active fieldbus cable, and all com units on this fieldbus cable become active com
units.
Master
Red.
Master
3.14

Fieldbus Connection

Danger!
Risk of explosion
Improperly installed fieldbuses can cause explosive mixtures to ignite.
Observe the wiring specifications set out in IEC/EN 60079-14 for laying lines in a hazardous
area.
Danger!
Risk of explosion
Accessories that do not meet the requirements for use in hazardous areas can cause
explosive mixtures to ignite.
Only use accessories and devices that are approved for use in the respective environment.
Connection
When possible, use plugs from the range of accessories. See chapter 2.6.1
Cable Lengths
Com units can be configured for various transfer rates. The desired transfer rate and the bus
system used dictate the maximum cable length.
For standard applications, the technical data for cable type A in accordance with DIN EN
61158 and DIN EN 61784 applies. The following table relates to standard applications.
44
Fieldbus
Redundant
Fieldbus
Backplane