● 5 system LEDs (PWR, STA1 ETH, STA2 ETH, S-ERR and I/O-Bus) show the operation
state of the module and display possible errors.
● 4 Ethernet state LEDs located at the terminal unit TU520-ETH
● 11 state LEDs for the serial interfaces an the CANopen Interface
● 1 LED to display the presence of the process supply voltage UP
Table 191: States of the 5 System LEDs
LED Color OFF ON Flashing
PWR/RUN Green Process supply
voltage missing
Internal supply
voltage OK,
module ready for
communication
with IO Controller
Start-up / pre-
paring communi-
cation
Yellow --- --- ---
STA1 ETH
(System-LED
"BF")
Green --- Device config-
ured, cyclic data
exchange run-
ning
---
Red --- --- Device is not
configured
STA2 ETH
(System-LED
"SF")
Green --- --- Got identification
request from I/O
controller
Red No system error System error
(collective error)
---
S-ERR Red No error Internal error --
I/O-Bus Green No expansion
modules con-
nected or com-
munication error
Expansion mod-
ules connected
and operational
---
Table 192: States of the 4 Ethernet State LEDs
LED Color OFF ON Flashing
ETH1-Link Green No connection at
Ethernet inter-
face
Connected to
Ethernet inter-
face
---
ETH1-Rx Tx Yellow --- Device is trans-
mitting telegrams
Device is trans-
mitting telegrams
ETH2-Link Green No connection at
Ethernet inter-
face
Connected to
Ethernet inter-
face
---
Eth2-Rx Tx Yellow --- Device is trans-
mitting telegrams
Device is trans-
mitting telegrams
Communication Interface Modules (S500) > PROFINET
2019/04/173ADR010121, 13, en_US1098
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