Parameter setting
With communication module LECOM−A (RS232)
6−16
L
EDB82MV752 EN 5.2
6.3.5 Troubleshooting and fault elimination LECOM−A (RS232)
Three LEDs on the LECOM−A (RS232) communication module show the status:
Green LED (Vcc) Yellow LED (RxD) Yellow LED (TxD)
Blinking Communication module is not initialised
yet.
Telegram is received. Response is transmitted
On Communication module is supplied with
voltage, no trouble
− −
Off Communication module is not supplied
with voltage.
No telegrams are received. No responses are transmitted.
Error Cause Remedy
No communication
with the controller
Controller is switched off:
No operating status display is lit at the controller.
The green LED Vcc is not lit.
Supply controller with voltage.
Communication module has no voltage:
The green LED Vcc is not lit.
Check connection with the controller.
Communication module was not initialised with the
controller.
Controller does not receive any telegrams.
Test: Let the host transmit telegrams cyclically (e.g. with
GDC in online operation).
If the yellow LED RxD is not blinking:
Check wiring to host.
Check the host if it transmits telegrams and uses the
correct interface.
Controller does not transmit telegrams.
Test: Let the host transmit telegrams cyclically. This can be
done e.g. with GDC in online operation.
If the yellow LED TxD is not blinking:
Check LECOM baud rate (C0125) of both nodes and
equate them, if required.
Do not use device addresses 00, 10, ..., 90.
The yellow LED TxD is blinking:
Check wiring to host.
Controller does not
execute write request
Controller transmits negative acknowledgement (NAK
response):
– No write access on C0044, C0046, since C0412 is
set incorrectly.
Set C0412/1, C0412/2 = 0.
– Attempt to write into code of read only" type. Write request is never possible.
Controller transmits positive acknowledgement (ACK
response):
– Controller works with another parameter set. Change over parameter set.
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