
8.CONNECTION TO FANUC I/O Link B-63943EN/02
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8.4.19 Other Notes
DO signal reaction to a system alarm
If a system alarm occurs in a CNC using the connector panel I/O
module, or if I/O Link communication between the CNC and
connector 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
to the CNC or the I/O module is turned off.
Address allocation
For the connector panel I/O module, I/O addresses are mapped as
follows.
Basic module
Xm
Xm+1
Xm+2
Extension module 1
Xm+3
Xm+4
Xm+5
Extension module 2
Xm+6
Xm+7
Xm+8
Extension module 3
Xm+9
Xm+10
Xm+11
Extension module 1
Xm+12 (for 1st MPG)
Xm+13 (for 2nd MPG)
Xm+14 (for 3rd MPG)
Basic module
Xm+15(DO alarm
detection)
DI space map
Basic module
Yn
Yn+1
Yn+2
Extension module 1
Yn+3
Yn+4
Yn+5
Extension module 2
Yn+6
Yn+7
Extension module 3
DO space map
The basic connector panel I/O module is allocated a group of DI
addresses (16 bytes) and a group of DO addresses (8 bytes). Up to
three hardware extension modules can be added or removed as
required. The reason for this address allocation is explained below.
The MPG interface (MPG counter) occupies a DI space from Xm+12
through Xm+14. These addresses are fixed regardless of whether
extension module 2 or 3 is used, 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 regardless of whether extension module 2 or 3 is
used, and it 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.