Detailed description
2.10 Memory requirements of basic PLC program for SINUMERIK 840D
Basic logic functions: PLC basic program solution line (P3 sl)
78 Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Note
The data blocks of channels, axes/spindles and tool management functions that are not
activated may be assigned as required by the user.
2.9.4 Assignment: Timers
Timer No. Significance
T 0 – to T 512
1)
User area
1)
Note:
The actual upper limit of the timer number (DB) depends on the PLC CPU on which the selected
NCU is located.
2.10 Memory requirements of basic PLC program for SINUMERIK 840D
General
The basic program consists of basic and optional functions. The basic functions include
cyclic signal exchange between the NC and PLC. The options include, for example, the FCs,
which can be used if required.
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 with SINUMERIK 840D
Block size (bytes)
Block
type no.
Function
Remark
Working
memory
Basic functions in basic program
FB1, FB15 must be loaded / on CF card 52182
FC2, 3, 5, 12 Must be loaded 470
DB4, 5, 7, 8 Must be loaded 1006
DB2, 3, 17 Are generated by the BP 632
OB1, 40, 100, 82, 86 Must be loaded 398
Total 55698
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