P4: PLC for SINUMERIK 828D
14.6 Function interface
Basic Functions
1172 Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Function start
Each function is activated by the positive edge of the corresponding "Start" signal. This signal must remain a
logical "1" until the function has been positively or negatively acknowledged (e.g. using
Position reached
= "1" or
Error
= "1"). The signal "Positioning axis active" = "1" indicates that the function is active and that the output
signals are valid.
Interrupt
It is notpossible to interrupt the function by resetting the start signal, but only via other interface signals (using the
axis-specific signal
Delete distance to go/spindle reset
, DB380x DBX2.2).
The axis interface returns axis status signals that may need to be evaluated (e.g.
exact stop
,
travel command
, →
DB390x).
If the axis/spindle is being traversed via the NC program when the PLC axis control is called (travel command
present), then the function is only started after this movement has ended. No error code is output in this situation.
Axis disable
With the axis disable set, an axis controlled via PLC axis control will not move. Only a simulated actual value is
generated. (Behavior as with NC programming).
14.6.4.2 User interface
Preparing the NC axis as PLC axis (axis interchange)
Firstly, the axis/spindle must be requested from the PLC. This is realized via the following user interface:
Common signals to axis/spindle (excerpt)
Request axis or spindle:
Every change to a request bit at the interface (DB380x.DBX0008.7 or bit DB380x.DBX0008.0) must be signaled
to the NC using a 0?1 edge of the activation signal (bit DB380x.DBX0008.4). This activation signal should be
reset again after one cycle.
Table 14-1
DB3800...3807 Signals to axis/spindle [r/w]
Data block PLC -> NCK interface
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DBB 0008 Request
PLC axis/
spindle
Activation
signal
when this
byte is
changed
Request
NC axis/
spindle
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