LED displays on the rear
For diagnostic purposes, the RJ45 sockets are each equipped with a green and a yellow LED.
This allows the following information on the respective port to be displayed:
Name Color Status Meaning
Link Green Lit 100 Mbit link available
Off Missing or faulty link
Activity Yellow Lit Sending or receiving
Off No activity
Next to the PN1 port there are two status LEDs (Fault, Sync) that apply to both ports:
Name Color Status Meaning
Fault Red Off For the 828D, all possible I/O modules, machine
control panels and PN/PN couplers are connec‐
ted. This is the reason why this status is not rel‐
evant for diagnostics.
Red Bus fault:
● No physical connection to a subnet/switch
● Incorrect transmission rate
● Full duplex transmission is not activated
Flashing red (2 Hz) For the 828D, this is a normal state and does not
represent incorrect behavior.
Sync Green Off The SINUMERIK 828D task system is not
synchronized to the send cycle of PLC I/O Inter‐
face. An internal substitute clock of the same size
as the send clock is generated.
Green The SINUMERIK 828D task system has been
synchronized to the cycle for PLC I/O Interface,
and data exchange is running.
Flashing green (0.5 Hz) The SINUMERIK 828D task system has been
synchronized to the cycle for PLC I/O Interface,
and cyclic data exchange is running.
LED displays on the front
The three LEDs located behind the front flap at the front of the PPU have the following
significance:
Name Color Status Meaning
RDY Green Lights up NC Ready and PLC in run mode.
Yellow Lights up PLC in stop mode
Flashing Power-up
Red Lights up NC in stop mode:
● When booting, if NC Ready is not yet available
● Critical fault (power off/on necessary)
Interface description
6.4 PLC I/O Interface based on PROFINET
PPU and components
74 Manual, 05/2015, 6FC5397-2DP40-3BA4
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