Siemens Simatic S7-300 Technical Data Manual page 194

Technical data of CPU 31x
7.6 CPU 317-2 DP
Technical data
FCs
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•
Address areas (I/O)
Total I/O address area
Distributed
I/O process image
Digital channels
of those local
Analog channels
of those local
Assembly
Racks
Modules per rack
Number of DP masters
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•
Number of function modules and communication processors you can operate
•
•
•
Time-of-day
Real-time clock
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•
•
•
Operating hours counter
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•
•
•
Clock synchronization
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•
7-28
Number
Length
Integrated
via CP
FM
CP (PtP)
CP (LAN)
Buffered
Buffered period
Behavior of the clock on expiration of the
buffered period
Accuracy
Number
Value range
Granularity
Retentive
In the PLC
On MPI
See the Instruction List
2048
(FC 0 to FC 2047)
64 KB
max. 8192 bytes/8192 bytes
(can be freely addressed)
max. 8192 bytes
256/256
65536/65536
Max. 1024
4096/4096
256/256
Max. 4
8
2
2
Max. 8
Max. 8
Max. 10
Yes (HW clock)
Yes
Typically 6 weeks (at an ambient temperature of
104 °F)
The clock keeps running, continuing at the time-
of-day it had when power was switched off.
Deviation per day: < 10 s
4
0 to 3
2 hours
31
(if SFC 101 is used)
1 hour
yes; must be manually restarted after every
restart
Yes
Master/slave
Master/slave
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05