LED
Color
OFF
ON
Flashing
STA1 ETH
(System LED
"BF")
Green
---
Device config-
ured, cyclic data
exchange run-
ning
Device config-
ured, acyclic data
exchange run-
ning
Red
---
Communication
error (timeout)
appeared
IP address error
STA2 ETH
(System LED
"SF")
Green
Device has valid
parameters
Device is running
parameterization
sequenze
Device has no
parameters
Red
---
---
Device has
invalid parame-
ters
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 165: States of the 29 process LEDs
LED
Color
OFF
ON
Flashing
DC0 to DC7
Yellow
Input/Output is
OFF
Input/Output is
ON
--
DI8 to DI15
Yellow
Input is OFF
Input is ON (the
input voltage is
even displayed if
the supply
voltage is OFF)
--
DO8 to DO15
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) > Modbus
2022/01/31
3ADR010278, 3, en_US
788