User`s manual

12
FX communication
Diagnostics 12
12-3
12.3 Parallel Link
12.3.1 Diagnostics
1 ) Check the status of the RD(RXD) LED and the SD(TXD) LED provided on each
communication unit.
• If the RD(RXD) and the SD(TXD) LED are lighted and extinguished, nothing is wrong.
• If the RD(RXD) LED is lighted/extinguished but the SD(TXD) LED is not lighted/extinguished
(not lighted at all), check the setting of the master station and the slave stations.
• If the RD(RXD) LED is not lighted/extinguished, check the wiring.
2 ) Make sure that the master station and the slave stations are set correctly. If the setting is
incorrect, correct it.
3 ) Make sure that the devices for the master station and the slave stations are handled
correctly. If they are handled incorrectly, correct the program so that they are handled
correctly.