
5.2 DO (output signal) alarm detection
The DO driver of the Basic and Expansion 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.
5.3
Setting of rotary switch (Distribution I/O Setting)
By changing the setting (rotary switch) for the expansion modules, connections can
be made by omitting some expansion modules as shown below.
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DESCRIPTION DESIG. DATE
TERMINAL TYPE I/O MODULE
CONNECTING MANUAL
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