
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
16i/18i/21i–B Connection Manual (Hardware)” (B–63523EN).
Example)
Rotary switch setting on expansion unit 1=1
Basic Expansion 1
CA52 CA53
X0–2X6–8 <=X3 to X5 are skipped.
11.10
IN A CONNECTOR
PANEL I/O UNIT,
DATA IS INPUT TO
AN UNEXPECTED
ADDRESS
If data is input to an invalid address in a connector panel I/O unit (for
example, data that should be input to
I0033+
is actually input to
I0081+
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 11.4.
(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:
GFKE-0222-EN
11.TROUBLESHOOTING
757