Troubleshooting and fault elimination
7-1
L
_^ONMObk
7
Troubleshooting and fault elimination
LED yellow (TxD)
LED green (Vcc)
LED yellow (RxD)
Operating-state display of
the controller
Fig. 7-1
LEDs on the fieldbus module 2102IB (see Fig. 4-2 page (
^
4-2) )
Fault
Cause
Remedy
Controller is switched off.
Display:
•
none of the operating-state displays is lit-up
and/or
•
green Vcc-LED is blinking
Supply controller with voltage (see corresponding Operating Instructions)
2102IB fieldbus module is not supplied with voltage
Display:
green Vcc-LED is not flashing or blinking.
•
With internal supply from the controller, check the connection to the
controller.
•
With external supply, check the voltage at terminals 39 and 59.
A voltage between 15 and 30 V must be applied (see chapter 4.3)
The 2102IB fieldbus module has not been initialized with the controller
Display:
green Vcc-LED is blinking.
•
Supply controller with voltage (see corresponding Operating
Instructions)
•
Check the connection to the controller.
No
communication
with the
controller.
The controller does not receive telegrams.
For a test, let the host send telegram cyclically. This happens, for
instance, with LEMOC2 in online operation.
The yellow RxD-LED must blink when the host sends a telegram.
If the yellow RxD-LED does not blink:
•
Check the wiring (see chapter 4.4)
and
•
Test whether the host sends telegrams and uses the appropriate
interface.
controller.
The controller does not send telegrams.
For a test, let the host send telegram cyclically. This happens, for
instance, with LEMOC2 in online operation.
The yellow TxD-LED must blink when the controller send a telegram to
the host.
1. Yellow TxD-LED is not blinking:
Parameter for LECOM unit address (C0009) and LECOM baud rate
(C0125) must be the same at the controller and the host. Check the
parameters C0009 and C0125 at both units and set them to the same
value if necessary.(Controller-address parameters 00, 10,
¼
, 90 must
not be used.)
2. Yellow TxD-LED is blinking:
•
The LECOM unit addresses (C0009) must be different at all
connected controllers. Correct possibly occurring double addressing.
•
Check the wiring to your host.
•
With self-developed LECOM-A/B software drivers and RS485
operation, observe the transmission control. After transmitting
signals, the host must return to receive mode after approx. 1 ms.
Controller does 1. Controller sends negative acknowledgement (NAK response):
Controller does
not execute
write job
•
The operating mode C0001 is set incorrectly for write access to
codes C0046 and C0135.
•
Set parameter 3 for operating mode C0001.
j
•
The code is defined so that it can only be read.
•
In general, write job not possible.
2. Controller sends positive acknowledgement (ACK response):
•
With 820X, parameters can only be changed when the controller is
inhibited (see chapter 6.3).
•
Activate controller inhibit
•
Controller uses a different parameter set
•
Changeover of the parameter set; the parameter change is then
activated.
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