
B–63083EN/02
9. CONNECTION TO FANUC I/O Link
188
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
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
DI space map DO space map
Output signal
DO alarm
detection
Not used
Input signal
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.
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 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. When allocating DI addresses, however, consider also the fixed
addresses that are directly supervised by the CNC, and keep the following
in mind.
9.6.9
Other Notes
DO signal reaction to a
system alarm
Address allocation