Technical data of CPU 31x
7.4 CPU 315-2 DP
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05
7-15
Technical data
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 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 log in for signaling
functions (e.g. OS)
16
(depends on the number of connections
configured for PG / OP and S7 basic
communication)
Process diagnostics messages Yes
• Simultaneously enabled interrupt S blocks
40
Testing and commissioning functions
Status/control variables Yes
• Variables
Inputs, outputs, memory bits, DBs, timers,
counters
• Number of variables
– Of those as status variable
– Of those as control variable
30
30
14
Forcing
• Variables
Inputs/Outputs
• Number of variables
Max. 10
Block status Yes
Single step Yes
Breakpoints 2
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