
B–63443EN/02
6. CONNECTION OF I/O UNITS TO
MACHINE INTERFACE
HARDWARE
71
DO signal reaction to a system alarm
If a system alarm occurs in a CNC using this operator’s panel I/O module,
or if I/O Link communication between the Power Mate 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 Power
Mate or the I/O module is turned off.
Address allocation
For the operator’s panel I/O module, I/O addresses are mapped as follows.
Xm Yn
Xm+1 Yn+1
Xm+2
Xm+15 (DO alarm detection)
Yn+2
Yn+3Xm+3
Xm+4
Xm+5
Xm+6
Xm+7
Xm+8
Xm+9
Xm+10
Xm+11
Xm+12
Xm+13
Xm+14
DI space map DO space map
Input signal
Not used
DO alarm detection
Output signal
Basically, this operator’s panel I/O module is allocated a group of DI
addresses (16 bytes) and a group of DO addresses (4 bytes).
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.
6.3.11
Other Notes