N4: Own channel - only 840D sl
9.2 Stroke control
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
561
9.2.5 PLC signals specific to punching and nibbling
Function
In addition to the signals used for direct stroke control, channel-specific PLC interface
signals are also available. These are used both to control the punching process and to
display operational states.
Signals
Signal Activation
DB21, ... DBX3.0 (no stroke enable) Prevents the NC from initiating a punching operation.
The NC waits until the enable signal is available
before continuing the part program.
DB21, ... DBX3.2 (stroke suppression) Allows the part program to be processed without
initiating a punching operation (dry run).
With active path segmentation, the axes traverse in
"Stop and go" mode.
DB21, ... DBX3.4 (delayed stroke) Activates delayed stroke output if permitted by
PDELAYON.
DB21, ... DBX3.1 (manual stroke
suppression)
Enables the operator to initiate a punching operation
(controlled via the PLC) without executing the part
program.
Manual stroke initiation is acknowledged with signal:
DB21, .. DBX38.1 (acknowledgement of manual
stroke initiation)
9.2.6 Punching and nibbling-specific reactions to standard PLC signals
DB21, ... DBX12.3 (feed stop)
With interface signal:
DB21, ... DBX12.3 (feed stop)
, the NC reacts in the following way with respect to the stroke control:
Signal is detected in advance of instant t
1
: Stroke initiation is suppressed.
The next stroke is not initiated until the next start or
until the "Feed stop" signal has been canceled.
Machining is then continued as if there had been no
interruption.
Signal is detected at instant t
1
: The current stroke is executed to completion.
The NC then dwells in the state characterized by t
4
.
To allow it to respond in this manner, time monitoring
of the "Stroke active" and "Stroke initiation" signals is
dispensed with.
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