
6. CONNECTION OF I/O UNITS TO
MACHINE INTERFACE
B–63323EN/03
136
DO signal reaction to a system alarm
If a system alarm occurs in the CNC using the operator’s panel 48/32 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.
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
MPG
Xm+12(for 1st MPG)
Xm+13(for 2nd MPG)
Xm+14(for 3rd MPG)
DI space map DO space map
Input signal
Output signal
Reserved
DO alarm detection
The operator’s panel 48/32 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, 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, 48/32 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.
6.5.9
Other Notes