Siemens Simatic S7-300 Technical Data Manual page 115

Technical data
Assembly
Racks
Modules per rack
Number of DP masters
•
•
Number of function modules and communication
processors you can operate
•
•
•
Time-of-day
Real-time clock
•
•
•
Operating hours counter
•
•
•
•
Clock synchronization
•
•
S7 signaling functions
Number of stations that can be logged on for
signaling functions
Process diagnostics messages
•
Testing and commissioning functions
Status/control variables
•
•
Forcing
•
•
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05
Integrated
Via CP
FM
CP (PtP)
CP (LAN)
Buffered
Accuracy
Behavior of the realtime clock after POWER
OFF
Number
Value range
Granularity
Retentive
In the PLC
On MPI
Simultaneously enabled interrupt S blocks
Variables
Number of variables
Of those as status variable
–
Of those as control variable
–
Variables
Number of variables
Technical data of CPU 31xC
Max. 1
Max. 8
None
Max. 1
Max. 8
Max. 8
Max. 4
Yes (SW clock)
No
Deviation per day < 10 s
The clock keeps running, continuing at the time-
of-day it had when power was switched off.
1
0
2 hours
31
(if SFC 101 is used)
1 hour
Yes; must be manually restarted after every
restart
Yes
Master
Master/slave
max. 6
(depends on the number of connections
configured for PG / OP and S7 basic
communication)
Yes
Max. 20
Yes
Inputs, outputs, memory bits, DBs, timers,
counters
Max. 30
Max. 30
Max. 14
Yes
Inputs, outputs
Max. 10
6.2 CPU 312C
6-5