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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x
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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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