
B-63983EN/02 11.PMC ALARM MESSAGES AND ACTIONS TO TAKE
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A system alarm occurs intermittently (A).
<Category> Loose power connection
<Configuration>
NC
I/O Unit-A
Group 0
Spindle
monitor unit
Group 1
I/O Unit-A
Group 2
I/O Unit-A
Group 3
<Cause> The cable was loosely connected to the terminal
block of the slave power unit; it was merely in
touch of the block. We conducted a voltage
measurement and found that the voltage of the
slave sometimes dropped from the 24-volt level.
<Explanation> At the time when this measurement was conducted,
the voltage of the slave dropped only by 2 volts or
so and no system alarm occurred. However, when
the voltage level is unstable, any instantaneous yet
substantial change in voltage can lead to an error.
To prevent this, check that each cable is connected
firmly, replace the power supply unit, or use a
stable power supply.
A system alarm sometimes occurs at powering on.
<Category> Restart of the slave at the time of the CNC restart
<Configuration> (Unknown)
<Cause> Due to a wiring mistake, some slaves did not turn
off their power even when the power of the CNC
was turned off.
<Explanation> When the master I/O Link device is restarted, all
the slaves need to be restarted as well. The error
occurred intermittently because only the CNC
power was turned on or off rather than turning on
or off the main power.