Siemens SINUMERIK 840D sl, Function Manual

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Basic logic functions: PLC Basic program powerline (P3 pl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
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Data lists
5
5.1 Machine data
5.1.1 NC-specific machine data
Number Identifier: $MN_ Description
10100 PLC_CYCLIC_TIMEOUT Cyclic PLC monitoring time
14504 MAXNUM_USER_DATA_INT Number of user data (INT)
14506 MAXNUM_USER_DATA_HEX Number of user data (HEX)
14508 MAXNUM_USER_DATA_FLOAT Number of user data (FLOAT)
14510 USER_DATA_INT User data (INT)
14512 USER_DATA_HEX User data (HEX)
14514 USER_DATA_FLOAT[n] User data (FLOAT)
Machine data in integer/hex format is operated in the NC as DWORD.
Machine data in floating comma format are operated in the NC as FLOAT (IEEE 8 byte).
They are stored in the NC/PLC interface and can be read by the PLC user program during PLC power-up from the DB 20.
5.1.2 Channelspecific machine data
Number Identifier: $MC_ Description
28150 MM_NUM_VDIVAR_ELEMENTS Number of elements for writing PLC variables