ABB AC500 PLC Hardware Manual page 1099

Table 193: States of the 8 State LEDs (4 per channel) of the Serial Interfaces
LED
COMx TxD
COMx RxD
COMx STA
COMx-ERR
2019/04/17
Color OFF
Yellow No data trans-
mission over
serial network
Yellow No data recep-
tion from serial
network
Yellow RS-232: RTS
signal not active
RS-485: Channel
is in reception
mode
RS-422:Channel
is not enabled
Red Channel enabled,
no error
or
Channel deacti-
vated
3ADR010121, 13, en_US
Communication Interface Modules (S500) > PROFINET
ON
--
--
RS-232: RTS
signal is active
RS-485: Channel
is transmitting
RS-422: Channel
is enabled (able
to receive and
transmit)
Channel boot up
Device Specifications
Flashing
Channel is trans-
mitting data via
the serial inter-
face (flashing
rate depending
on the telegram
transmission fre-
quency)
Channel is
receiving data
from the serial
interface
(flashing rate
depending on the
telegram recep-
tion frequency)
--
Channel error
(receive buffer
overflow)
1099