Siemens CPU 31 Series Technical Data Manual page 171

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Technical data
Analog channels
Of those central
Removal
Module rack
Modules per rack
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
Process diagnostics messages
Test and startup functions
Status/control variables
CPU 31xC and CPU 31x, Technical Data
Manual, 01/2006 Edition, A5E00105475-06
Integrated
Via CP
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
Technical data of CPU 31x
Max. 64
Max. 64
Max. 1
Max. 8
None
4
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
7.2 CPU 312
7-5

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