Special cases with rapidly flashing LEDs (approx. 5 Hz):
● All 4 LEDs flash rapidly: An incorrect S500 module is connected to the device. The device
fails to initialize.
● The LEDs of the CS31 bus, S-ERR bus and I/O bus flash rapidly: Invalid position of DIP
switches. The device fails to initialize.
● The LEDs of the S-ERR bus and I/O bus flash rapidly: A checksum error occurred in an
internal Flash memory.
● The LED of the I/O bus flashes rapidly: An error occurred in an internal RAM.
Table 47: LEDs of the S500 module DO524
LED
Status
Color LED off
LED on
LED flashes
O0…O7 (see
No. 1 in the
following
figure)
Digital inputs/
outputs
Yellow Input/output is
not activated
Input/output is acti-
vated (input voltage
is indicated even if
supply is switched
off)
-
I8 to I15 (see
No. 2 in the
following
figure)
Digital inputs/
outputs
Yellow Input/output is
not activated
Input/output is acti-
vated (input voltage
is indicated even if
supply is switched
off)
-
O16 to O23
(see No. 3 in
the following
figure)
Digital inputs/
outputs
Yellow Input/output is
not activated
Input/output is acti-
vated (input voltage
is indicated even if
supply is switched
off)
-
C24 to C31
(see No. 4 in
the following
figure)
Digital inputs/
outputs
Yellow Input/output is
not activated
Input/output is acti-
vated (input voltage
is indicated even if
supply is switched
off)
-
Error indica-
tions right
(see No. 5 in
the following
figure)
Error indica-
tion
Red
No error
Internal error
Overload or
short circuit on
a channel of
the corre-
sponding
group
Indication
supply
voltage (see
No. 6 in the
following
figure)
Process
voltage
Green Process voltage
not available
Process voltage OK -
AC31 Adapters
Replacement devices: I/O modules > Replacement device 07DC92-AD
2018/09/24
3ADR010122, 8, en_US
81
