Siemens SINUMERIK 840D sl Function Manual page 1114

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Table of Contents

P4: PLC for SINUMERIK 828D

14.6 Function interface

Variable index

The variable index refers to the name of the NC variable. The variable index consists of a start

value 100 and the offset of the NC variable in the list (0 to 41).

The variable index is entered as DBB1000 A_VarIdx in the DB120x RW_NCDx user interface.

The comment contains the following data record with space as separator:

● VariablenName

● VarAnzByte

Extended user interface

The data test in data blocks means the value of a variable can be written to an address in the

data block that has the same type, e.g. a REAL value can be written only to a REAL address

(e.g. with MOV_R). The "Read/write NC variable " user interface contains currently only one

address of the DWORD type for the value to be written (DBD1008). This means a REAL value

can be written only via a temporary variable, flag or accumulator. The same is also true for

reading (DBD3004). For this reason, the "Read/write NC variable" user interface is extended.

For reading and writing one address for each type is added: REAL, DWORD/DINT, WORD/

INT, BYTE and BOOL (DBD1016 ... DBB1027 or DBD3016 ... DBB3027). These new

addresses are used by the PLC firmware only for those variables selected with the NC variables

editor – and entered into DB9910 NC_DATA when compiled (variable index ≥ 100). The NC

variables currently defined in the "Read/write NC variable" user interface continue to use the

old addresses (DBD1008 or DBD3004).

Program instance services (PI services)

User interface

Job specification

PI services are specified via the job interface (DB1200 from offset 4000).

PI service [r/w]

PLC → NCK interface

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

Basic Functions

Sinumerik 828d Sinumerik 840de sl