Siemens sinumerik 828d Service Manual page 76

Service cases - hardware
4.1 PPU 24x.2/26x.2/28x.2
There are 2 additional LEDs "FAULT" and "SYNC" next to port 1, which apply to both ports:
Name
FAULT
SYNC *)
See also
Additional connections at the rear of the PPU:
● System versions horizontal and vertical (Page 15)
● System versions, BASIC T and BASIC M (Page 17)
76
Color State
Red OFF
Is lit
Flashing
(2 Hz)
Green OFF
Is lit
Flashing
(0.5 Hz)
Meaning
For the maximum expansion level of the PLC I/O: The data
exchange to all configured IO devices runs without errors.
Bus fault:
No physical connection to a subnet/switch

Incorrect transmission rate

Full duplex transmission is not activated.

If the PN fault LED flashes red, there is no fault. The maximum
expansion level of the PLC I/O is not being used.
Task system of the SINUMERIK 828D is not synchronized to the
send clock of the PLC I/O interface based on PROFINET IO. An
internal substitute clock of the same size as the send clock will
be generated.
Task system of the SINUMERIK 828D has synchronized to the
clock of the PLC I/O interface based on PROFINET IO, data is
being exchanged.
Task system of the SINUMERIK 828D has synchronized to the
clock of the PLC I/O interface based on PROFINET IO, data is
being cyclically exchanged.
Service Manual, 03/2011, 6FC5397-5DP40-0BA0
Hardware and Software