Pepperl+Fuchs LB Series User Manual

LB Remote I/O System
Troubleshooting
2018-07
53
6Troubleshooting
Communication Errors
Danger!
Risk of explosion
When work is performed on the remote I/O unit in hazardous areas, there is a risk of explosion
from spark formation.
Before starting any work on the remote I/O unit, familiarize yourself with the instruction
manuals for the components and their relevant certificates.
Error Remedy
Communication error on
the fieldbus
 Check that the cables are connected.
 Check that the transmitting and receiving lines are wired correctly and have
not been swapped.
 Check that the nodes are positioned in linear form and without branches. A
star-shaped layout is not permitted.
 Check that the terminator has been activated. The fieldbus must have exactly
two terminators per segment, one at the start and one at the end.
 In the configuration software, check that the selected address is the same as
the remote I/O station address.
 In the configuration software, check whether the master read cycle and the
com unit watchdog are coordinated with one another.
Communication error on
the service bus
 Check that the cables are connected.
 Check that the nodes are positioned in linear form and without branches. A
star-shaped layout is not permitted.
 Check that the terminator has been activated. The service bus must have
exactly two terminators per segment, one at the start and one at the end.
 In the configuration software, check that the selected address is the same as
the remote I/O station address.
 Check that the correct interface is preset in the configuration software.
Communication error on
the service bus after
successfully establishing
a connection
 Check that the service bus is galvanically isolated.
 If you are using a laptop, operate the laptop using a battery.
 Use a standard interface converter (RS-232 to RS-485 converter or USB to
RS-485 converter) with automatic detection of the baud rate and transmission
direction.
A new remote I/O station
will not work on a bus if
other remote I/O stations
are already operating on
the bus.
 Check that the terminators are still on the start and end of the bus after
expansion.
The software cannot
locate a com unit when
establishing the
connection
 Check that the com unit is plugged in correctly.

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)