Pepperl+Fuchs LB Series User Manual

2018-07
54
LB Remote I/O System
Troubleshooting
Redundancy Faults
Signal Faults
Fault Remedy
Continuous redundancy
switchover
 Check that the correct type of redundancy is selected (media redundancy or
application redundancy).
 In the configuration software, check whether the master read cycle and the
com unit watchdog are coordinated with one another.
 Check that the process control system is set to the correct type of redundancy.
No redundancy
switchover when a com
unit is removed
 Check that redundancy has been configured at the com unit.
 Check that there is an electrical connection between the two com units. If not,
establish a connection.
I/O modules are
continuously changing the
data
 Check whether one of the com units has not been configured for redundancy
mode. If this is the case, both com units actively try to access the I/O modules
and interfere with one another.
Fault Remedy
Faulty signal  Check whether the I/O module is in simulation mode or whether it is working
with substitute values.
 Check if there is a short circuit or lead breakage within the circuit.
 Check that the field devices and sensors are working properly.
 Check the communication path to the I/O module.
 If necessary, replace the I/O module.
All signals for a station are
faulty
 Check that the power supply is working properly.
 Check the bus connection.
 Check the bus communication using a bus monitor.
The output module
switches off
Communication with the com unit is interrupted.
 Check that the I/O module is plugged into the backplane properly.
 If necessary, switch off the status bits for analog outputs in the configuration
software.
Input module sporadically
delivers no measured
values
Communication with the com unit is interrupted.
 Check that the I/O module is plugged into the backplane properly.
Measured values
occasionally incorrect
 Check whether the measured value is being distorted by external influences.
 Check that the shielding is intact.
I/O module reported to be
faulty
 Check that the correct I/O module is plugged in.
 Check that the green LED on the I/O module is lit and that the I/O module is
correctly plugged in.

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)