PiXtend eIO Hardware Manual
6.2.4.3 Signaling: Error LED „ERR“
Some error states that may occur with PiXtend eIO may not be able to be reported back to
the bus master via RS485, e.g. in case of faulty communication or if the watchdog of the
PiXtend eIO has triggered. For these situations, a red LED "ERR" was provided on the
PiXtend eIO devices.
This LED can be used for problem determination, the meaning of the different states are
listed below:
Property
Value
Comment
off
ready, no error
-
on (permanent)
telegram error
Modbus RTU protocol:
Wrong Function Code (FC)
Number of registers, colis or discrets is wrong
message error
PiXtend eIO ASCII protocol:
Frame Error, Parity Error, Overrun Error, wrong
baud rate set
flashing fast (0.05 s)
communication error
configuration error
For Modbus RTU & PiXtend eIO ASCII protocol:
Error during data transfer
Configuration via DIP switch inadmissible or
changed during operation
flashing (0.1 s)
command error
Only for PiXtend eIO ASCII protocol:
the sent command is unknown or not supported
flashing low (0.2 s)
I/O error
Only for PiXtend eIO ASCII protocol:
the desired input or output is not present (for
example when trying to set output 9, but there are
only 8 outputs).
flashing 3x fast, 3x slow,
1s break
Watchdog
For Modbus RTU & PiXtend eIO ASCII protocol:
Watchdog-Timer of the device has triggered
Table 16: LED „ERR“ - Signaling of error conditions
The one-time flashing red when starting the devices is normal and does not indicate an
error. Similarly, the orange LED "COM" flashes briefly on startup.
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