11. TROUBLESHOOTING
B–63525EN/02
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Check that the connected I/O devices are connected properly to the power
supplies and that the voltages are as prescribed.
Check that the power–on sequence is correct.
Time at which an I/O device is to be turned on
Before the CNC is turned on or within 500 ms after the CNC is
turned on
When the CNC is turned off, the I/O devices must also be turned off.
(Otherwise, the I/O Link may not be established the next time the CNC
is turned on.)
As in the example shown on the previous page, I/O Link cables are used
to connect JD1As and JD1Bs.
JD1A represents an upper unit while JD1B represents a lower unit.
Check that the cables are connected correctly.
Check that the input/output signals to be connected to each I/O device are
connected correctly.
For operator’s panel I/O modules and for connector panel I/O modules,
also check that the 0 V or +24 V input signal is connected to the common
pin and that the +24 V output signal is connected to the DO common pin.
Check that I/O Link allocation has been performed correctly.
Selecting [EDIT] and then [MODULE] from the PMC screen causes the
allocation edit screen to be displayed.
After editing allocation, write the changes to the FROM on the [I/O]
screen. Otherwise, the changes will be lost when the power is turned off.
The checking of allocation requires a Ladder editing card.
D Checking the power
supplies of the I/O
devices
D Connection of cables
D Connection of I/O signals
D I/O Link allocation