Detailed description
2.7 Structure and functions of the basic program
Basic logic functions: PLC basic program solution line (P3 sl)
56
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Read/Write NC variables
NCK variables can be read with FB GET while values can be entered in NCK variables with
FB PUT. The NCK variables are addressed via identifiers at inputs Addr1 to Addr8. The
identifiers (symbols) point to address data, which must be stored in a global DB. To allow
generation of this DB, PC software is supplied with the basic program with which the
required variables can be selected from a table, which is also supplied. The selected
variables are first collected in a second, projectrelated list. Command Generate DB creates a
*.AWL file, which must be linked to the program file for the machine concerned and compiled
together with the machine program.
1 to 8 values can be read or written with a read or write job. If necessary, the values are
converted (e.g., NCK floating point values (64 bits) are converted to PLC format (32 bits with
24-bit mantissa and 8bit exponent) and vice versa). A loss of accuracy results from the
conversion from 64 bits to 32bit REAL. The maximum precision of 32bit REAL numbers is
approximately 10 to the power of 7.
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Summary of Contents for SINUMERIK 840D sl
Page 282: ...Index Basic logic functions Acceleration B2 64 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 388: ...Basic logic functions Travel to fixed stop F1 Function Manual 11 2006 6FC5397 0BP10 2BA0 52 ...
Page 962: ...Index Basic logic functions Emergency Stop N2 20 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 1704: ...Constraints Basic logic functions Spindles S1 94 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 1716: ...Index Basic logic functions Spindles S1 106 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 1996: ...Index Basic logic functions Tool Offset W1 208 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 2150: ...Table of contents Basic logic functions Appendix 4 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 2184: ...Glossary Basic logic functions Appendix 38 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...