Siemens S7-300 appendix Technical data

Technical data of CPU 31x 7.6 CPU 317-2 DP

Technical data

FCs		See the Instruction List
•	Number	2048
		(FC 0 to FC 2047)
•	Length	64 KB
Address areas (I/O)
Total I/O address area		max. 8192 bytes/8192 bytes
		(can be freely addressed)
Distributed		max. 8192 bytes
I/O process image		256/256
Digital channels		65536/65536
of those local		Max. 1024
Analog channels		4096/4096
of those local		256/256
Assembly
Racks		Max. 4
Modules per rack		8
Number of DP masters
•	Integrated	2
•	via CP	2
Number of function modules and communication processors you can operate
•	FM	Max. 8
•	CP (PtP)	Max. 8
•	CP (LAN)	Max. 10
Time-of-day
Real-time clock		Yes (HW clock)
•	Buffered	Yes
•	Buffered period	Typically 6 weeks (at an ambient temperature of
		104 °F)
• Behavior of the clock on expiration of the		The clock keeps running, continuing at the time-
	buffered period	of-day it had when power was switched off.
•	Accuracy	Deviation per day: < 10 s
Operating hours counter		4
•	Number	0 to 3
•	Value range	2 31 hours
		(if SFC 101 is used)
•	Granularity	1 hour
•	Retentive	yes; must be manually restarted after every
		restart
Clock synchronization		Yes
•	In the PLC	Master/slave
•	On MPI	Master/slave

7-28	CPU 31xC and CPU 31x, Technical data
	Manual, Edition 08/2004, A5E00105475-05