Panasonic VL-W1-N Series Setup And Maintenance Manual page 162

„ External control
Troubles
Signals from the
external device are
refused
Control by serial
communication fails
162
Causes
Laser welding machine is not
in remote mode.
The connection with external
devices is inadequate.
There are noises coming
from surrounding equipment.
The RS-232C cable is
connected to the wrong
connector (RETURN OUT).
The connection of the
communication cable is
incorrect.
Communication parameter
settings are incorrect.
The communication setting
was changed at the time of
backup file importing.
Command data is not
received from external
equipment.
Communication data format
is inadequate.
Select the remote mode by following the procedure indicated in
Setup/Maintenance Guide.
• Check connections with external equipment for mis-
connection, disconnection or contact failure due to any loose
connector.
• Check for continuity using tester or the like.
Protect laser welding machine against noises as follows:
• Securely ground the frame ground terminal of laser welding
machine or surrounding equipment.
• Isolate power and signal lines from each other if they have
been routed in parallel.
• Shield signal line.
• Isolate power supply for laser welding machine from other
equipment.
• Use noise cut transformer to absorb noises from power
supply.
Connect the RS-232C cable to "RS-232C" connector on the rear
of the controller.
• Check the connection method described in Setup/
Maintenance Guide for proper wiring.
• For RS-232C connection, confirm the wiring of the external
device including the loop back connection.
• Match communication parameter settings to external
equipment.
• When using RS-232C, specify the "Flow control" to "None"
at the communication port settings of the external control
device.
Check the communication setting. When the backup file is
restored, the communication setting is overwritten by the backup
data.
Using commercially available line monitor or protocol analyzer,
check if the external equipment transmits data.
• Check if start code STX (02: HEX) is placed at beginning of
transmitted data.
• Check if a delimiter is placed at the end of the transmitted
data.
• Check if the delimiter is the value specified in the laser
welding machine on the environment setting screen.
ME-VLW1N-SM-1
Measures