KEYENCE Visual KV Series - Manual (Page 328)

7.8 Troubleshooting Guide KV-300 Series Only
KV
-300
KV-10/80
Chapter 7 KV-L2 Serial Interface Module
1-304
7
7.8 Troubleshooting Guide
7.8.1 Troubleshooting
KV-L2
Error Cause Remedy
POWER indicator
does not light. The KV-300 CPU power switch
is not ON. Supply 24 VDC power to the KV-
300 CPU.
Power supply capacity is
insufficient. Check power supply capacity. If
capacity is insufficient, replace
power supply with one that
accommodates the current
capacity.
KV-L2 is not securely connected
to KV-300 CPU. Remove KV-L2 from KV-300
CPU and reconnect it securely.
Communication is
disabled. (Port
operation indica-
tors do not light.) Communication protocol is
incorrect. Parity, data length, stop bit, and
baud rate of KV-L2 must corre-
spond to settings of external
device. Verify setting of communi-
cations protocol setting switch.
Transmission cable is not
connected. Connect transmission cable.
Reception cable is not connected. Connect reception cable.
Mode setting is incorrect. Change mode setting to appro-
priate mode.
KV-L2 is not securely connected
to the KV-300 CPU. Remove KV-L2 from KV-300
CPU and reconnect it securely.
Communication is
occasionally
disrupted. Cables are not connected
securely. Check cable wiring.
Cable is faulty. Replace cable.
In multi-drop mode, terminators
of stations at both ends are not
ON. Set terminators of stations at
both ends to ON.
A strong noise source is located
near the system. Isolate KV-300 CPU and cables
from noise source.
Power and connection cables
are in close proximity. Isolate power cable from connec-
tion cable.
Unreadable data is
transmitted. Communications protocol of KV-
L2 does not match that of
external device. Parity, data length, stop bit, and
baud rate of KV-L2 must corre-
spond to settings of external
device. Verify setting of commu-
nications protocol switch.
A strong noise source is near
the system. Isolate the KV-300 CPU and
cables from the noise source.
Power and connection cables
are in close proximity. Isolate the power cable wiring
from connection cable wiring.
Station no. designation is
incorrect. Transmit the correct station no.
Designated protocol includes an
error. Add data to correct protocol as
designated.
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