Technical data of CPU 31x
7.7 CPU 317-2 PN/DP
CPU 31xC and CPU 31x, Technical Data
Manual, 01/2006 Edition, A5E00105475-06
7-35
Technical Data
Of those central 256/256
Assembly
Racks Max. 4
Modules per rack 8
Number of DP masters
• Integrated
1
• via CP
4
Number of function modules and communication processors you can operate
• FM
Maximum 8
• CP (PtP)
Maximum 8
• CP (LAN)
Maximum 10
Time-of-day
Real-time clock Yes (hardware clock)
• Factory setting
DT#1994-01-01-00:00:00
• 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.
• Behavior of the realtime clock after POWER
ON
The clock continues running after POWER 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
S7 signaling functions
Number of stations that can be logged on for
signaling functions
32
(depends on the number of connections
configured for PG / OP and S7 basic
communication)
Process diagnostics messages Yes
• Simultaneously enabled interrupt S blocks
60
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