Memory Requirements Of The Basic Plc Program - Siemens SINUMERIK 828D Function Manual

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
Function
type no.
Basic functions in basic program
FB 1, FB 15
FC 2, 3, 5, 12
DB 4, 5, 7, 8
DB 2, 3, 17
OB 1, 40, 100, 82, 86
PLC/NCK, PLC/HMI interface
DB 10 PLC/NCK signals
DB 11 Signals PLC/Mode group
DB 19 PLC/HMI signals
DB 21 to DB 30 PLC/channel signals
DB 31 to DB 61 PLC / axis or spindle
signals
Basic program options
Machine control panel
FC 19 Transfer of MCP signals,
M variant
FC 25 Transfer of MCP signals,
T variant
FC 24 Transfer of MCP signals,
slim variant
FC 26 Transfer of MCP signals,
HT8 variant
Handheld unit
FC 13 Display control HHU
Error/operating messages
FC 10 Acquisition FM/BM
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
P3: Basic PLC Program for SINUMERIK 840D sl
13.11 Memory requirements of the basic PLC program
Remark
must be loaded /
on CF card
Must be loaded
Must be loaded
Are generated by the BP
Must be loaded
Total
Must be loaded
Is generated by BP
Is generated by BP
Are generated by BP as a function of NC­MD:
for each DB
Are generated by BP as a function of NC­MD:
for each DB
Must be loaded when M variant of MCP is
installed
Must be loaded when T variant of MCP is
installed
Must be loaded when slim variant of MCP is
installed
Must be loaded for HT8
Can be loaded for handheld units
Load when FM / BM is used
Block size (bytes)
Working
memory
52182
470
1006
632
398
55698
262
56
434
416
148
92
92
100
68
144
66
909