Plc Actions After Block Search - Siemens SINUMERIK 828D Function Manual

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Table of Contents

K1: Mode group, channel, program operation, reset response

9.7 Block search

Block search type 4 and part program command REPOS

After block search type 4 (block search with calculation at block end point) no automatic repositioning is initiated

during the following period of time by the part program command REPOS:

Start: NC/PLC interface signals: DB21,... DBB32, Bit6 (last action block active) == 1

End: Continuing the part program processing per NC START,.

The start point of the approach movement is represented by the current axis positions of the channel axes at the

time of the NC start command. The end point results from the other transversing movements programmed in the

part program.

For block search type 4, no approach movement is generated by the NC.

After exiting the ASUB, the system variable $P_EP thus provides the actual position, on which the channel

axes of the ASUB were positioned (or manual (mode: JOG).

$P_EP == "current actual position of the channel axis"

PLC actions after block search

To allow activation of PLC actions (starting of ASUBs, call-up of PLC functions) after the end of the block search

at a defined point, there is the NCK/PLC interface signal:

DB21, ... DB32.6 (last action block active) == 1

This means that all action blocks are processed and that actions are possible by the PLC (ASUB, FC) or the

operator (overstoring, mode change after JOG/REPOS). This allows the PLC to perform another tool change, for

example, before the start of the transversing movement.

By default, alarm 10208 is output at this moment to notify the operator that another NC START is needed to

continue program execution.

In combination with alarm 10208, the following interface signals are set:

DB21, ... DBX36.7 (NCK alarm with processing stop)

DB21, ... DBX36.6 (channel-specific NCK alarm is present)

PLC-controlled alarm triggering

The setting by which alarm 10208 is only triggered after ending the PLC action, is done via machine data:

MD11450 $MN_SEARCH_RUN_MODE, Bit 0 = 1

With the change of the last action block after a block search, the following takes

Execution of the part program is stopped

DB21, ... DBB32.6 (last action block active) = 1

Alarm display: Alarm 10208 only if the following applies:

DB21, ... DBX1.6 (PLC action ended) == 1

Function Manual, 09/2011, 6FC5397-0BP40-2BA0

Basic Functions

Sinumerik 840d sl