Siemens SINUMERIK 840D sl Function Manual page 1056

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Table of Contents

P3: Basic PLC program for SINUMERIK 840D sl

13.17 Block descriptions

Machine function INC

The HT 8 signals of the machine function INC are transferred differently depending upon the

active coordinate system MCS or WCS:

● Active coordinate system: MCS

The selected machine function INC is transferred for all 6 axes in the axis-specific interfaces

in DB31, ... .DBX5.0 to DBX5.5 (machine function) of the axes programmed in the table in

DB10.DBB8 to DBB13 (machine axis numbers) .

● Active coordinate system: WCS

For the axes 1 to 3 the signals of the machine function INC are transferred in the channel-

specific. Interface in DB21, ... .DBX13.0 to DBX13.5 (machine function) of the programmed

channel (Parameter: "ChanNo").

For the axes 4 to 6 the signals of the machine function INC are transferred in the channel-

specific. interfaces in DB31, ... .DBX5.0 to DBX5.5 (machine function) of the axes

programmed in the table in DB10.DBB11 to DBB13 (machine axis numbers).

The selection signals of the INC machine functions are transferred in the mode group-specific

interface DB11.DBB 2 + (n * 20), bit 0 to bit 5 (with n = 0, 1, 2, ...). The FC26 informs the NCK

about the activation of the mode group-interface for the INC machine functions once after

power-up with DB10.DBX57.0 (INC inputs active in the mode group area).

Handwheel selection

The hand-wheel selection signals are evaluated by HMI and transferred to the corresponding

NC/PLC interface signals of the machine or geometric axes:

● Geometry axes: DB21, ... DBB 12 + (n * 4), bit 0 to bit 2 (with n = 0, 1, 2)

● Machine axes: DB31, ... .DBX4.0 to DBX4.2

Requirement: FB1 parameters: "HWheelMMC" = TRUE

Multiple call in one PLC cycle

FC26 can be called a multiple number of times in a single PLC cycle. Upon the first call in the

● All actions of the parameterized blocks are executed

● The LED signals are written in the output area

● In case of selected WCS, the traversing key signals of the geometric axes are written

● The signals for the selection and deselection of the individual block are processed

When FC26 is called more often, then the channel and mode group interface are processed

at a reduced rate.

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

Basic Functions

Sinumerik 828d Sinumerik 840de sl