KEYENCE N-410 - Manual (Page 145)

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Troubleshooting
If an abnormality occurs with this device while you are using it, confirm the following points.
If these steps do not resolve the problem, please contact KEYENCE.
 Confirm communication between the N-410 and the BL/SR/RF Series devices with the N-410
connection test mode. If it is not operating properly, check the following conditions.
• Do the N-410 and all BL/SR/RF Series devices have power?
• Do the BL, RF Series and NX-50RS settings for baud rate, data bits and stop bit length to match the
RS-485 side of the N-410 settings?
• Is "Multi-drop" enabled on the BL/SR/RFSeries devices?
• Are the BL/SR/RF Series ID numbers unique?
• Does the setup of the multi-drop network conform to the cable, length and device count
specifications?
• Are the connections branched or connected to terminals?
• Are the terminator settings correct?
 Confirm the following points regarding the connection between the host computer and the N-410.
• Do the host computer settings for baud rate, data bits and stop bit length to match the RS-232 side
of the N-410 settings?
• Are the N-410 host protocol settings the desired settings?
 Confirm the N-410 settings.
• Do the N-410 "Slave settings" match the ID numbers and connection types of the connected BL/
SR/RF Series devices?
 Refer to "7-4 PLC Link Errors" (Page 7-19) for more information.
 Refer to "N-410 Send Buffer" (Page 4-9) or "Send buffers for BL Series, SR Series, and RF
Series devices" (Page 4-9) for more details.
 The DC power input is not within the specified range. Confirm the following points.
• Is the wiring correct? Are the power cables connected correctly?
• Is the DC power input is within the specified range?
Refer to "2-2 N-410 Connections and Wiring" (Page 2-5) for more information.
 There is an error in the slave type or the ID numbers. Change the slave type and ID numbers to
match the devices connected.
Refer to "Slave settings" (Page 3-6) for more information.
Communication is not working properly.
A "PLC" link error occurs (the N-410 display shows "94")
A "Buffer overflow" occurs
The display does not show anything.
The N-410 display blinks "00".