Siemens Simatic S7-300 Specifications Page 112

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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x
6-28 A5E00105475-03
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Analog channels max. 256
of those local max. 256
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Module racks max. 4
Modules per module rack 8
Number of DP masters
Integrated None
via CP max. 1
Number of function modules and
communication processors you can operate
FM max. 8
CP (PtP) max. 8
CP (LAN) max. 10
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Real-time clock yes (HW clock)
Buffered Yes
Backup period normally 6 weeks (at an ambient
temperature of 40 °C)
Accuracy Deviation per day: < 10 s
Operating hours counter 1
Number 0
Range of values 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
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Number of stations that can log in for
signaling functions (e.g. OS)
12
(depends on the number of connections
configured for PG / OP and S7 basic
communication)
Process diagnostic messages Yes
simultaneously enabled interrupt S
blocks
max. 40
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Status/Modify Variables Yes
Variable Inputs, outputs, flags, DBs, timers, counters
Number of variables 30
Of those as status variable 30
of those as control variable 14
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