Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 User Manual
Page 181
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