Siemens CPU 31 Series Technical Data Manual page 209

Technical data
Analog channels
•
•
•
•
Removal
Racks, Max.
Modules per rack, Max.
Number of DP masters
•
•
Operable function modules and communication
processors
•
•
•
Time
Clock
•
•
•
•
•
•
Operating hours counter
•
•
•
•
•
Time synchronization
•
•
•
•
S7 message functions
Number of stations that can be logged on for
signaling functions
CPU 31xC and CPU 31x, Technical Data
Manual, 01/2006 Edition, A5E00105475-06
Inputs
Outputs
Inputs, central
Outputs, central
Integrated
Via CP
FM
CP (PtP)
CP (LAN)
Hardware clock
Buffered
Buffered period
Behavior of the clock on expiration of the
buffered period
Behavior of the realtime clock after POWER
ON
Accuracy
Number
Number
Value range
Granularity
Retentive
supported
In the AS
On MPI
on Ethernet via NTP
Technical data of CPU 31x
4096
4096
256
256
4
8
2
4
8
8
10
Yes
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
0 to 2 hours
31
(using the SFC 101)
1 hour
Yes; must be manually restarted after every
restart
Yes
Master/slave
Master/slave
Yes (as client)
32
(depends on the number of connections
configured for PG / OP and S7 basic
communication)
7.8 CPU 319-3 PN/DP
7-43