
B–63083EN/02
9. CONNECTION TO FANUC I/O Link
155
The DO driver of the Basic and Extension module A/B is capable of
detecting an overcurrent and measuring its own temperature. If an
accident, such as the connecting of 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 and 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 I/O module continue operating. The DI address (Xm+15) identifies
the DO driver which has detected the 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 alarm processing for
the area in advance by using Ladder. This helps alarm detection and
recovery.
Alarm detection
address and bit
DO address Location
Xm+15.0 Yn+0 Basic module
Xm+15.1 Yn+1 Basic module
Xm+15.2 Yn+2 Extension module 1
Xm+15.3 Yn+3 Extension module 1
Xm+15.4 Yn+4 Extension module 2
Xm+15.5 Yn+5 Extension module 2
Xm+15.6 Yn+6 Extension module 3
Xm+15.7 Yn+7 Extension module 3
NOTE
This function is not supported by the 2A output module or
analog input module.
Allocation of the 2A output module and analog input module
The 2A output module and analog input module can be allocated to any
of the spaces for expansion modules 1, 2, and 3. In addition, up to three
2A output modules or analog input modules can be allocated to all the
spaces for expansion modules 1, 2, and 3. When an MPG interface is
required, the module occupies the space for expansion module 1; no 2A
output module or analog input module can be allocated in the space for
expansion module 1.
The 2A output module does not involve DI points, so that the DI area of
the space in which a 2A output module is allocated is unusable. When a
2A output module is allocated to the space for expansion module 2, for
example, the areas from Xm+6 to Xm+8 cannot be used. (The spaces for
the other modules are not shifted. In this case, the DI space of expansion
module 3 remains at Xm+9 through Xm+11.)
DO (output signal) alarm
detection