Siemens SINUMERIK 840C Installation Instructions Manual page 623

9 Drive Servo Start-Up Application (as from SW 3)
Internal
PLC
PLC without NC
(as from SW 4)
9–2
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The following conditions must be fulfilled before the traversing motion can be
started:
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NC operating mode "JOG"
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No traversing command for axis/spindle
S
No follow-up mode (for axes)
S
No parking
S
No axis/spindle disable
S
No alarms
S
No EMERGENCY STOP
S
No warm restart
S
Channel in reset
S
Controller enabling command
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Drive enabling commands
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Feed/spindle enabling command
S
No HW limit switch (for axes)
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Feed override 0 (for axes)
S
No PLC spindle control
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No violation of working area limits (for axes)
The traversing motion is initiated through actuation of the NC start hardkey.
Axes with a mechanical brake also require a brake activation function. Select the
"PLC" enables for this purpose. In this enable mode, the PLC signal "Motion en-
able drive test" acts in addition to the traverse enabling commands listed above.
The traversing motion is likewise initiated through actuation of the NC start hard-
key.
Use the request signal "Traverse request drive test" which is generated with
selection of the measuring function in the PLC user program and the
acknowledgement signal "Motion enable drive test" (see Interface Description –
DB29 and DB31).
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On "Traverse request drive test", switch on the control and enable the brake.
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Acknowledge the enabling of the control and brake with "Motion enable drive
test", following expiry of a delay timer if appropriate.
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The measuring function can only start when this sequence is complete.
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On completion of the measurements – when "Traverse request drive test"
disappears, disable the brake and control again.
In this enable mode, a positive edge of the PLC signal "Motion enable drive test"
is required to start the traversing motion.
NC start is not necessary. In this mode, the number of internal enable monitoring
functions is reduced to axial signals
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Controller enable
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Follow-up
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Parking
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Pulse enable
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Motion enable drive test
and to the general signals
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Key reset
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NCK mode switchover
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EMERGENCY STOP
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Warm restart.
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SINUMERIK 840C (IA)