
3.SAFETY FUNCTIONS B-64004EN/02
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3.7 SAFE MACHINE POSITION MONITORING
While the door is open, the dual check safety function checks whether
the position on each feed axis is within the safe machine position
range defined by safety parameters. If it detects a machine position
beyond the safety range, the dual check safety function immediately
enters the stop state. If each axis is not stopped, the dual check safety
function enters the safety stop state.
For each feed axis, up to four safe positions can be specified in safety
parameters.
Both the CNC and the Servo monitor whether each axis is within the
safety position. The range of the safety machine position can be
changed by the Safety Speed / Safety Position Selection signals
(SVAn/SVBn for feed axis).
Safety Speed/Safety
Position Selection signal
Safety machine position
parameter
Name
SVAn SVBn + direction - direction
Safety machine
position 1
0 0 No.13831 No.13832
Safety machine
position 2
1 0 No.13833 No.13834
Safety machine
position 3
0 1 No.13835 No.13836
Safety machine
position 4
1 1 No.13837 No.13838
When “out of position error” is detected, Monitoring Result signal
(RSVx) is set to “0”. In this situation, if Safety Check Request signal
(*VLDVx) is “0” and safety monitor is executed, an alarm is
generated.
Error detected CPU Alarm
CNC SV0495
SV SV0477
CAUTION
1 The safe machine position monitoring function
does not keep monitoring the specified range. Only
after the function detects that a position on a feed
axis exceeds the range, the system enters the stop
state. Accordingly, in the stop state, an over travel
has occurred on the feed axis. The travel distance
depends on the traveling speed and other
conditions.
2 When an “out of position error” is detected, if the
axis is not stopped after the time specified in the
parameter, the MCC Off signal (*MCFVx) is turned
to “0”.