Detailed description
2.2 Reserve resources (timers, counters, FC, FB, DB, I/O)
Basic logic functions: PLC basic program solution line (P3 sl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
13
Mode selector on PLC CPUs for 840D
On the NCU component, the right-hand twist button labeled "PLC" is used to set the PLC
operating mode.
The switch settings are listed in the following table.
Switch setting Significance Remark
0 RUN-P
1 RUN Cannot load program
2 STOP
3 MRES
2.2 Reserve resources (timers, counters, FC, FB, DB, I/O)
Reserve resources (timers, counters, FC, FB, DB, I/O)
The components below are reserved for the basic program:
Timers
• No reservation
Meters
• No reservation
FC, FB, DB
• FC0 to FC29 and FB0 to FB29 are reserved for the basic program. The number range
between 1000 and 1023 is also reserved for FCs and FBs. DB1 to DB62, DB71 to DB80
are reserved for data blocks. The number range 1000 to 1099 is also reserved in addition
for DB. The data blocks of channels, axes/spindles and tool management functions that
are not activated may be assigned as desired by the user.
I/O range
• The PLC 317 has an I/O address volume of 8192 bytes each for inputs and outputs. The
address ranges starting at 4096/4096 are reserved for/occupied by integrated drives.
However, diagnostic addresses for modules can be assigned to the highest address
range as proposed by STEP7. Furthermore, the address range between 256 and 287 is
assigned for the NCK, CP and HMI in rack 0 on the SIMATIC 300 station.
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