Siemens Simatic S7-300 Technical Data Manual page 171

Technical data
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
•
•
Block status
Single step
Breakpoints
Diagnostic buffer
•
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05
FM
CP (PtP)
CP (LAN)
Buffered
Accuracy
Behavior of the realtime clock after POWER
ON
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
Number of entries (not configurable)
Technical data of CPU 31x
Max. 8
Max. 8
Max. 4
Yes (SW clock)
No
Deviation per day < 15 s
The clock keeps running, continuing at the time-
of-day it had when power was switched off.
1
0
2
31
(if SFC 101 is used)
1 hour
Yes; must be manually restarted after every
restart
Yes
Master
Master/slave
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
30
30
14
Yes
Inputs, outputs
Max. 10
Yes
Yes
2
Yes
Max. 100
7.2 CPU 312
7-5