P3: Basic PLC Program for SINUMERIK 840D sl
13.11 Memory requirements of the basic PLC program
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
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13.11
Memory requirements of the basic PLC program
The basic program consists of basic and optional functions. The basic functions include cyclic signal exchange
between the NC and PLC. The Options include e.g. the FCs, which can be used, if needed.
The table below lists the memory requirements for the basic functions and the options. The data quoted
represent guide values, the actual values depend on the current software version.
Memory requirements of blocks for SINUMERIK 840D sl
Block
type no.
Function
Remark
Block size (bytes)
Working
memory
Basic functions in basic program
FB 1, FB 15
must be loaded /
on CF card
52182
FC 2, 3, 5, 12
Must be loaded
470
DB 4, 5, 7, 8
Must be loaded
1006
DB 2, 3, 17
Are generated by the BP
632
OB 1, 40, 100, 82, 86
Must be loaded
398
Total
55698
PLC/NCK, PLC/HMI interface
DB 10
PLC/NCK signals
Must be loaded
262
DB 11
Signals PLC/Mode group
Is generated by BP
56
DB 19
PLC/HMI signals
Is generated by BP
434
DB 21 to DB 30
PLC/channel signals
Are generated by BP as a function of NCMD:
for each DB
416
DB 31 to DB 61
PLC / axis or spindle
signals
Are generated by BP as a function of NCMD:
for each DB
148
Basic program options
Machine control panel
FC 19
Transfer of MCP signals,
M variant
Must be loaded when M variant of MCP is
installed
92
FC 25
Transfer of MCP signals,
T variant
Must be loaded when T variant of MCP is
installed
92
FC 24
Transfer of MCP signals,
slim variant
Must be loaded when slim variant of MCP is
installed
100
FC 26
Transfer of MCP signals,
HT8 variant
Must be loaded for HT8
68
Handheld unit
FC 13
Display control HHU
Can be loaded for handheld units
144
Error/operating messages
FC 10
Acquisition FM/BM
Load when FM / BM is used
66