
B–63833EN/03
9. CONNECTION TO FANUC I/O Link
229
The DO driver of the I/O module is capable of detecting an overcurrent
and measuring its own temperature. If an accident, such as connecting the
cable to ground, causes an abnormal increase in the load current or in the
driver temperature, a protection circuit, which is provided for each DO
driver (1 byte), is activated which keeps the DO signal for the relevant 1
byte in the OFF state until the cause of the problem is eliminated. Even
if this occurs, the CNC and the I/O module continue operating. The DI
address (Xm+15) identifies which DO driver has detected an alarm. The
following table shows the correspondence between the DI address
(Xm+15) bits and the DO addresses. Bit value “1” indicates that the
corresponding DO driver has detected an alarm. The contents of the
Xm+15 area can be checked by using the DGN screen of the CNC or by
performing the alarm processing for the area in advance by using Ladder.
This helps alarm detection and recovery.
Alarm detection address
and bit
DO address Remarks
Xm+15.0 Yn+0
Xm+15.1 Yn+1
Xm+15.2 Yn+2
Xm+15.3 Yn+3
Xm+15.4 Yn+4
Xm+15.5 Yn+5
Xm+15.6 Yn+6
Xm+15.7 Yn+7 Reserved
DO (output signal) alarm
detection