
B–63503EN/02
9. CONNECTION TO FANUC I/O Link
165
If a system alarm occurs in a CNC using this 48/32–point 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, due care must be taken when setting up the machine sequence.
Also, the same phenomenon occurs if the power of 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
Reserved
Xm+12
Xm+13
Xm+14
Xm+15 (DO alarm
detection)
Yn
Yn+1
Yn+2
Yn+3
DI space map DO space map
Output signal
DO alarm
detection
Input signal
Reserved
NOTE
Reserved addresses can not used.
Basically, this 48/32–point I/O module is allocated a group of DI
addresses (16 bytes) and a group of DO addresses (4 bytes). This address
allocation is explained below.
DI address Xm+15 is used for detecting overcurrent and overheating
alarms that 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.
When using this area, therefore, allocate DI addresses in units of 16 bytes.
Basically, I/O addresses can be allocated to the 48/32–point I/O module
freely.
9.6.8
Other Notes
DO signal reaction to a
system alarm
Address allocation