Siemens SINUMERIK 840Di Function Manual page 1260

Detailed Description
2.10 Memory requirements of basic PLC program for 810D, 840D
2.9.4 Assignment: Timers
Timer No.
T 0 – to T 512
1)
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 810D, 840D
2.10
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 Function
type no.
Basic functions in basic program
FB 1, (15)
FC 2, 3, 12, 20
DB 4, 5, 7, 8, 17,
19
DB 2, 3, 6
OB 1, 40, 100
PLC/NCK, PLC/HMI interface
DB 10 PLC/NCK signals
DB 11 Signals PLC/Mode group
DB 21, 30 PLC/channel signals
DB 31, ...61 PLC/axis or spindle
signals
2-66
Meaning
User area
1)
Remark
Must be loaded
Must be loaded
Must be loaded
Are generated by the BP
Must be loaded
Total value
Must be loaded
Is generated by BP
Are generated by BP as a function of NCMD
Are generated by BP as a function of NCMD
PLC Basic Program Solution Line (P3 sl)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Block size (bytes)
Working
memory
678
2146
1480
812
282
5398
262
56
412 each
14 each