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Fault diagnosis
4
Fault diagnosis
VISY-Input 8 has several LEDs which help in diagnosing problems. The positions of the LEDs
can be found in the figure 1.
4.1
Transmit LED TxD (8) / Receive LED RxD (9)
The two red communication LEDs indicate, whether data are received or transmitted from
VISY-Input 8.
Under normal conditions, the communication LEDs should light up regularly.
4.2
Input LEDs (10)
The eight red input LEDs indicate, whether an input is activated or deactivated.
The LEDs are assigned from left to right to the inputs 1 to 8.
If an input is used as voltage input, the related input LED is on, when the
voltage at the clamps"In" and "GND" is in the range of +5 V to +24 V.
If an input is used as relay input, the related input LED is on, when the relay
contact connected to the terminals "In" and "+12 V" is closed.
4.3
Status LED (11)
The yellow status LED indicates the status of the communication between interface card VI in
the VISY-Command and VISY-Input 8. The following table lists the possible states of the sta-
tus LED and explains their meanings.
Status LED
Error
Description
on
no error
correct data are regularly received
continuously
blinking
no communication
no data were received since the last power up
1 x short
flashing
interruption of the
communication
no correct data were received for more than 1 minute
Table 1: Status LED
Under normal conditions, the status LED should remain illuminated.
Содержание VISY-Input 8
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