LED
Color
OFF
ON
Flashing
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
modules con-
nected and
operational
---
ETH1
Green
No connection at
Ethernet inter-
face
Connected to
Ethernet inter-
face
---
Yellow
---
Device is trans-
mitting telegrams
Device is trans-
mitting telegrams
ETH2
Green
No connection at
Ethernet inter-
face
Connected to
Ethernet inter-
face
---
Yellow
---
Device is trans-
mitting telegrams
Device is trans-
mitting telegrams
Table 173: States of the 27 process LEDs
LED
Color
OFF
ON
Flashing
AI0 to AI3
Yellow
Input is OFF
Input is ON
(brightness
depends on the
value of the
analog signal)
--
AO0 to AO1
Yellow
Output is OFF
Output is ON
(brightness
depends on the
value of the
analog signal)
--
DI0 to DI7
Yellow
Input is OFF
Input is ON (the
input voltage is
even displayed if
the supply
voltage is OFF)
--
DO0 to DO7
Yellow
Output is OFF
Output is ON
--
UP
Green
Process supply
voltage missing
Process supply
voltage OK and
initialization fin-
ished
--
UP3
Green
Process supply
voltage missing
Process supply
voltage OK
--
CH-ERR1 to CH-
ERR3
Red
No error or
process supply
voltage missing
Internal error
Error on one
channel of the
corresponding
group
Device specifications
Communication interface modules (S500) > PROFINET
2022/01/31
3ADR010278, 3, en_US
827