Pepperl+Fuchs LB Series User Manual

LB Remote I/O System
Installation
2018-07
47
EMC filters are used in many devices to divert any interference to ground. For the sake of
symmetry, all lines are provided with suitable capacitance. Capacitively coupled high-
frequency interference is effectively canceled out by the symmetrical layout.
Figure 3.19 EMC filters in signal paths
The same applies to galvanically isolated signals. However, unexpected results may arise in
networks created by multichannel systems without isolation. This is because the filter
capacitors may even run in parallel, depending on the setup. Isolate the channels to eliminate
any interference.
Figure 3.20 EMC filters in a network (simplified diagram)
3.15.2 Wiring
Lay the signal leads such that they are separate from the power cables. Please note that AC
voltages and current spikes can induce stray voltages in neighboring lines. Thus, shielded
cables should be used for EMC-tested devices.
Grounding bars can be laid separately from the shielding (see IEC/EN 60079-14). The
shielding is then grounded at one point.
Danger!
Risk of explosion from improper installation
Improperly installed lines can lead to ignition of explosive mixtures.
Observe the installation regulations according to IEC/EN 60079-14 for laying cables in
hazardous areas.

Pepperl+Fuchs LB Series Specifications

General

Mounting	DIN Rail
Zone	Zone 1, Zone 2
Power Supply	24 V DC
Protection Class	IP20
System Type	Remote I/O System
Communication Protocols	PROFIBUS DP
I/O Modules	Analog, Digital
Signal Type	Analog, Digital
Number of Channels	Varies by module
Intrinsic Safety	Yes
Isolation	Channel to channel, channel to system
Output Current	Varies by module (e.g., 0.5 A, 2 A)
Connection Type	Screw terminals
Dimensions	Varies by module
Weight	Varies by module
Temperature Range	-20 ... 60 °C (-4 ... 140 °F)