Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 194)

Technical data of CPU 31x
7.6 CPU 317-2 DP
CPU 31xC and CPU 31x, Technical data
7-28
Manual, Edition 08/2004, A5E00105475-05
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
buffered period
The clock keeps running, continuing at the time-
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