ABB AC31 Assembly And Operation Manual page 117

● 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 68: S500 module AO523 LEDs
LED
O0+...O7+
O8+...O15+
(see No. 1 + 2
in the fol-
lowing figure)
Error indica-
tion left (see
No. 3 in the
following
figure)
Error indica-
tion right (see
No. 3 in the
following
figure)
Indication
supply voltage
(see No. 4 in
the following
figure)
Fig. 73: AO523
1.5.4.2.8 Technical data
This section provides additional information on section
bus system data" on page 4. In case of doubt, the following information applies.
For the device 07AC91-AD, only the operating mode "8 bit" is relevant.
2018/09/24
Replacement devices: I/O modules > Replacement device 07AC91-AD
Status Color
Analog out- Yellow
puts
Error indica- Red
tion
Error indica- Red
tion
Process Green
voltage
3ADR010122, 8, en_US
LED off LED on
Output is not Output is acti-
activated vated (bright-
ness depends
on value of
analog
signal).
No error Internal error
No error Internal error
Process Process
voltage not voltage OK
available
Ä Chapter 1.3 "System data and CS31
AC31 Adapters
LED flashes
-
-
-
-
117