Detailed Description
2.10 Memory requirements of basic PLC program for 810D, 840D
PLC Basic Program Solution Line (P3 sl)
2-66 Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
2.9.4 Assignment: Timers
Timer No. Meaning
T 0 – to T 512
1)
User area
1)
The actual upper limit of the timer number (DB) depends on the PLC CPU on which the selected
NCU is located.
2.10 2.10 Memory requirements of basic PLC program for 810D, 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
FB 1, (15) Must be loaded 678
FC 2, 3, 12, 20 Must be loaded 2146
DB 4, 5, 7, 8, 17,
19
Must be loaded 1480
DB 2, 3, 6 Are generated by the BP 812
OB 1, 40, 100 Must be loaded 282
Total value 5398
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 21, 30 PLC/channel signals Are generated by BP as a function of NCMD 412 each
DB 31, ...61 PLC/axis or spindle
signals
Are generated by BP as a function of NCMD 14 each
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