Siemens S7-300 appendix Technical data Address areas I/O, Assembly

Technical data of CPU 31xC 6.3 CPU 313C

Technical data

Address areas (I/O)

Total I/O address area		max. 1024 bytes/1024 bytes
		(can be freely addressed)
I/O process image		128 bytes/128 bytes
Digital channels		Max. 1016
•	of those local	Max. 992
•	Integrated channels	24 DI / 16 DO
Analog channels		Max. 253
•	of those local	Max. 248
•	Integrated channels	4 + 1 AI / 2 AO
Assembly
Racks		Max. 4
Modules per rack		max. 8; max. 7 in rack 3
Number of DP masters
•	Integrated	None
•	via CP	Max. 2
Number of function modules and communication
processors you can operate
•	FM	Max. 8
•	CP (PtP)	Max. 8
•	CP (LAN)	Max. 6
Time-of-day
Real-time clock		Yes (HW clock)
•	Buffered	Yes
•	Buffered period	Typically 6 weeks (at an ambient temperature of
		40 °C)
• 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		1
•	Number	0
•	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
•	On MPI	Master/slave
S7 signaling functions
Number of stations that can be logged on for		Max. 8
signaling functions		(depends on the number of connections
		configured for PG / OP and S7 basic
		communication)

6-10	CPU 31xC and CPU 31x, Technical data
	Manual, Edition 08/2004, A5E00105475-05