2018/04 – Subject to change
23
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Terminal CPX-P
Key features – Diagnostics
Diagnostics
System performance
3
4
1
2
5
6
1
Undervoltage monitoring
2
Diagnostics via bus interface
3
Diagnostic overview LED
– Fieldbus status
– CPX-P status
4
Status and diagnostic LED
for module and I/O channels
5
Module and channel-specific
diagnostics
6
Valve-specific diagnostic module
and solenoid coils
Detailed diagnostic functions are
needed in order to quickly locate the
causes of errors in the electrical
installation and therefore reduce
downtimes in production plants.
A basic distinction is made between
on-the-spot diagnostics using LEDs or
an operator unit (CPX-MMI) and
diagnostics using a bus interface.
The CPX-P terminal supports on-the-
spot diagnostics via a row of LEDs.
This is separate from the connection
area and therefore provides good
visual access to status and diagnostic
information.
Module and channel-specific
diagnosis is supported, for example
Undervoltage detection for outputs
and valves
Short circuit detection for sensors,
outputs and valves
Open-load detection for a missing
solenoid coil
Storage of the last 40 causes of
errors with error start and error end
The diagnostic messages can be read
out via the bus interface in the higher-
order controller and visualised for the
central recording and evaluation of
error causes. This is done using the
individual fieldbus-specific channels.
The CPX-CEC also offers the option of
access via the integrated Ethernet
interface (remote maintenance via
PC/web applications).
Overview of LEDs on the bus node
1
2
1
Fieldbus-specific LEDs
On each bus node, a maximum of
4 fieldbus-specific LEDs display
the fieldbus communication
status of the CPX-P terminal with
the higher-order controller.
2
CPX-P-specific LEDs
A further 4 CPX-P-specific LEDs
provide non-fieldbus-specific
information about the status of
the CPX-P terminal, for example
– Power system
– Power load
– System fault
– Modification parameters
Input/output module status and diagnostic LEDs
1
2 3
1
Status LEDs for the inputs and
outputs
Each input and output channel is
assigned a status LED.
2
Channel-oriented diagnostic
LEDs
Depending on the module
design, another diagnostic LED is
available for each I/O channel.
3
Group diagnostic LEDs
An LED displays the group
diagnostics for each module.
