Siemens CPU 312 - Page 135

Technical data of CPU 31xC
6.5 CPU 314C-2 PtP and CPU 314C-2 DP
CPU 31xC and CPU 31x, Technical Data
Manual, 01/2006 Edition, A5E00105475-06
6-23
Technical data
CPU 314C-2 PtP CPU 314C-2 DP
Assembly CPU 314C-2 PtP CPU 314C-2 DP
Racks Max. 4
Modules per rack Max. 8; Max. 7 in rack 3
Number of DP masters
• Integrated
No 1
• via CP
4 4
Number of function modules and
communication processors you can
operate
• FM
Max. 8
• CP (PtP)
Max. 8
• CP (LAN)
Max. 10
Time-of-day CPU 314C-2 PtP CPU 314C-2 DP
Real-time clock Yes (HW clock)
• Buffered
Yes
• Buffered period
Typically 6 weeks (at an ambient temperature of 40 °C)
• 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 CPU 314C-2 PtP CPU 314C-2 DP
Number of stations that can log in for
signaling functions (e.g. OS)
Max. 12
(depends on the number of connections configured for PG / OP and S7 basic
communication)
Process diagnostics messages Yes
• Simultaneously enabled interrupt S
blocks
Max. 40
Testing and commissioning functions CPU 314C-2 PtP CPU 314C-2 DP
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
Max. 30
Max. 30
Max. 14