
7. TROUBLESHOOTING
B–63325EN/03
412
In the event of a failure upon inputting and outputting data to and from
I/O Link slave stations (such as the connector panel I/O unit, operation
board I/O unit, I/O Unit–A, I/O Unit–B, and Power Mate), identify the
cause by applying the procedure below:
First, check that the cables and the power supplies are all normal.
(1)If “NO I/O DEVICE” is displayed on the PMC alarm screen (displayed
by selecting “PMCDGN” and then “ALARM”):
None of the slave stations are linked. The most likely causes are:
· The power–on timing of the slave stations differs from that of the
NC.
→ Turn on the power to the slave stations first, then the master
station (NC). Alternatively, turn on the power to all the stations
simultaneously.
· The slave stations have not been turned off.
→ If the master station is turned off, all the slave stations must be
turned off.
· The I/O Link cables are not connected correctly.
→ Check that the cables are connected as shown below:
Group 0
Group 1
Host station (NC)
Slave station #0
Slave station #0
JD1A
JD1B
JD1A
JD1B
JD1A
· Other than the correct I/O Link cables are being used.
→ Refer to “FANUC I/O Link Connection” in the “FANUC Series
15i Connection Manual (Hardware)” (B–63323EN) for
information on how to connect cables as well as their lengths.
7.17
FAULT TRACE
PROCEDURE
(FOR I/O LINK)
7.17.1
Failure to Input and
Output I/O Link Data
7.17.1.1
Checking whether
hardware links have
been established