
7. TROUBLESHOOTING
B–63325EN/03
416
This indicates that a RAM parity error occurred within the NC. Replace
the NC main board.
If the BOOT screen is displayed on a slave station such as the Power
Mate–H, I/O Link initialization has not been completed. The host NC
may, therefore, enter the wait state and fail to start.
If data is input to an invalid address in a connector panel I/O unit (for
example, data that should be input to X004 is actually input to X010 in
a connector panel I/O unit), the most likely causes are as follows:
(1)The I/O Link allocation is wrong.
→ Perform the check described in Section 7.17.2.
(2)The unit–to–unit cables (CA52–to–CA53) are not connected
correctly.
If the connection is wrong, expansion unit 1 is allocated the address
of expansion unit 3, as shown below.
→ Connect the unit–to–unit cables as shown below:
Correct connection (the allocation starts with X0)
Incorrect connection (the allocation starts with X0)
Basic Expansion 1
Basic Expansion 1
Expansion 2
Expansion 2
Expansion 3
Expansion 3
CA52 CA53 CA52 CA53 CA52 CA53
CA52 CA52 CA53 CA53 CA52 CA53
X0–2X3–5X6–8X9–11
X0–2X9–11 X6–8X3–5
(3)The setting of the rotary switch on an expansion unit is wrong
If the rotary switch is set to 1, one unit number is skipped. If set to 2,
two unit numbers are skipped. Usually, the setting must be 0. (For
those units without a rotary switch, unit numbers cannot be skipped.)
→ See the following example and refer to the “FANUC Series 15i
Connection Manual (Hardware)” (B–63323).
Example)
Rotary switch setting on expansion unit 1=1
Basic Expansion 1
CA52 CA53
X0–2X6–8 <=X3 to X5 are skipped.
7.17.2.4
If “xx#3=1” or “xx#4=1”
in NMI SLC xx:yy
7.17.3
Failure to Start the NC
on the Host Station
7.17.4
In a Connector Panel
I/O Unit, Data is Input
to an Unexpected
Address