Memory Requirements Of The Basic Plc Program - Siemens SINUMERIK 840D sl Function Manual

The SIMATIC S7 block FB390 "ALM_Control" checks the status of the ALM and enables the
user to switch it on or off.
A description of the block and an example project are available for download under the
following link to Industry Online Support:
http://support.automation.siemens.com/WW/view/de/49515414
13.15

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.
Working memory
Basic functions in basic program
FB1, FB15
FC2, 3, 5, 12
DB4, 5, 7, 8
DB2, 3, 17
OB1, 40, 100, 82, 86
PLC/NCK, PLC/HMI interface
DB10 PLC/NCK signals
DB11 Signals PLC/Mode group
DB19 PLC/HMI signals
DB21 to 30 PLC/channel signals
DB31 to 61 PLC / axis or spindle
signals
Basic program options
Machine control panel
FC19 Transfer of MCP signals,
M variant
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
P3: Basic PLC program for SINUMERIK 840D sl
13.15 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 instal‐
led
Block size (bytes)
52182
470
1006
632
398
55698
262
56
434
416
148
92
897