Plc Axis Control - Siemens SINUMERIK 840D sl Function Manual

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P4: PLC for SINUMERIK 828D

14.6 Function interface

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

indicates that the function is active and that the output signals are valid.

It is notpossible to interrupt the function by resetting the start signal, but only via other interface

signals (using the axis-specific signal

The axis interface returns axis status signals that may need to be evaluated (e.g.

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).

User interface: Preparing the NC axis as PLC axis

Firstly, the axis/spindle must be requested from the PLC. This is realized via the following user

Common signals to axis/spindle (excerpt)

Request axis or spindle:

DB3800 ... 3807

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.

Position reached = "1" or Error = "1"). The signal "Positioning axis active" = "1"

Signals to axis/spindle [r/w]

Delete distance to go/spindle reset , DB380x DBX2.2).

PLC → NCK interface

Function Manual, 01/2015, 6FC5397-0BP40-5BA2

exact stop ,

Basic Functions

Sinumerik 828d Sinumerik 840de sl