Siemens Simatic S7-300 Technical Data Manual page 201

Technical data
Analog channels
of those local
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
•
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05
Integrated
via CP
FM
CP (PtP)
CP (LAN)
Factory setting
Buffered
Buffered period
Behavior of the clock on expiration of the
buffered period
Behavior of the realtime clock after POWER
ON
Accuracy
Number
Value range
Granularity
Retentive
In the PLC
On MPI
Simultaneously enabled interrupt S blocks
Variables
Technical data of CPU 31x
4096/4096
256/256
Max. 4
8
1
2
Max. 8
Max. 8
Max. 10
Yes (hardware clock)
DT#1994-01-01-00:00:00
Yes
Typically 6 weeks (at an ambient temperature of
104 °F)
The clock keeps running, continuing at the time-
of-day it had when power was switched off.
The clock continues running after POWER OFF.
Deviation per day: < 10 s
4
0 to 3
2 hours
31
(if SFC 101 is used)
1 hour
yes; must be manually restarted after every
restart
Yes
Master/slave
Master/slave
32
(depends on the number of connections
configured for PG / OP and S7 basic
communication)
Yes
60
Yes
Inputs, outputs, memory bits, DBs, timers,
counters
7.7 CPU 317-2 PN/DP
7-35