
3.SAFETY FUNCTIONS B-63494EN/02
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Signals other than safe-related I/O
The following signals are not safe-related signals (are not checked in
redundant mode) but are important signals in the system. The machine
tool builder must create an appropriate Ladder program.
IMPORTANT
The Ladder program cannot be checked for an
error. Check the safety function (see Chapter 7).
10. ORQn Guard open request signal (input)
When this signal is input, the CNC checks the machine position and
speed. If both the machine position and speed are within the safe range,
the guard unlock signal (*LGD) is set to 1 (guard unlock enabled).
The machine tool builder must provide an output signal that opens the
actual protective door through the PMC. Connect the signal output.
When two or more protective doors are installed, the guard open
request signal needs to be input for each protective door.
11. OPT Test mode signal (input)
When the signal is input, a MCC off Test is executed. The MCC off
Test checks whether the contact of the MCC is closed. When carrying
out the MCC off Test manually, execute a MCC off Test by the PMC
and make necessary corrections before inputting this signal.
12. *LGDn Guard unlock signal (output)
If this signal is set to 1, the protective door can be unlocked. Then, a
signal to unlock the actual protective door should be output through
the PMC.
If the protective door is unlocked while the signal is set to 0, an alarm
occurs and brings the motor into the safe stop state.
CAUTION
When the signal is set to 1, there is a time delay
(depending on the Ladder program) before the
signal to unlock the actual protective door is output.
Meanwhile, the protective door is locked, and safety
is ensured. If an error is found as a result of speed
check or machine position check during that period,
*LGD becomes 0. If a single failure occurs in this
state and if the actual protective door is unlocked,
an alarm occurs.
When the safety function of the CNC is enabled, this signal is output.
If the signal is output, the signal to unlock the actual protective door
should be output through the PMC.
When two or more protective doors are installed, the guard unlock
signal is output for each protective door.
13. RQT MCC off Test execution request signal (output)
If the execution of a MCC off Test is required, this signal is output. At
power-on, this signal is output. If this signal is output, a MCC off Test
must be executed.