
B–64193EN/01
8. CONNECTION TO FANUC I/O Link
169
If a system alarm occurs in the CNC using the operator’s panel I/O
module, or if I/O Link communication between the CNC and operator’s
panel I/O module fails, all the DO signals of the I/O module are turned
off. Therefore, sufficient care is necessary when setting up the machine
sequence. Also, the same phenomenon occurs if the power to the CNC
or the I/O module is turned off.
For the operator’s panel I/O module, I/O addresses are mapped as follows.
Xm
Xm+1
Xm+2
Xm+3
Xm+4
Xm+5
Xm+6
Xm+7
Xm+8
Xm+9
Xm+10
Xm+11
MPG
Xm+12 (for 1st MPG)
Xm+13 (for 2nd MPG)
Xm+14 (for 3rd MPG)
Xm+15 (DO alarm
detection)
Yn
Yn+1
Yn+2
Yn+3
Yn+4
Yn+5
Yn+6
Yn+7
DI space map
General–purpose
input signal
Reserved
Matrix input
signal
Reserved
DO alarm
detection
DO space map
Output signal
Reserved
The operator’s panel I/O module is allocated a group of DI addresses (16
bytes) and a group of DO addresses (8 bytes). This address allocation is
explained below.
The MPG interface (MPG counter) occupies DI space from Xm+12
through Xm+14. These addresses are fixed, and Xm+12 through Xm+14
must be allocated as a DI work area to enable the use of the MPG.
Therefore, when using an MPG for the i series CNC, allocate DI addresses
in units of 16 bytes. Do not use the DI space from Xm+12 through Xm+14
for Ladder; the CNC processes the MPG counter value directly.
DI address Xm+15 is used for detecting overcurrent and overheating
alarms that may occur in the IC used in the DO driver. [For details, see
the section describing the detection of DO (output signal) alarms.] This
address is fixed, and must be allocated as a work area before it can be used.
Therefore, when using this area, allocate DI addresses in units of 16 bytes.
Basically, I/O addresses can be allocated to the operator’s panel I/O
module freely. When allocating DI addresses, however, consider also the
fixed addresses that are directly supervised by the CNC, and keep the
following in mind.
8.5.10
Other Notes
DO signal reaction to a
system alarm
Address allocation