CPUs
1-65
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Interfaces
1. Interface
Functionality
MPI Yes
DP Master No
DP Slave No
Galvanically isolated No
MPI
Services
– PD/OP
communication
Yes
– Global data
communication
Yes
– S7 basic
communication
Yes
– S7 communication Yes (server)
Transmission rates 19.2; 187.5 Kbps
2. Interface
Functionality
DP Master Yes
DP Slave Yes
– Status/Modify;
Program; Routing
Yes, can be activated
Direct data exchange Yes
Point-to-point
connection
No
Default setting None
Galvanically isolated Yes
DP Master
Services
– Equidistance Yes
– SYNC/FREEZE Yes
– Activation/deactivat
ion of DP slaves
Yes
Transmission rates Up to 12 Mbps
Number of DP slaves max. 64
Address area max. 1 KB I/1 Kbyte O
User data per DP slave max. 244 bytes I and
244 bytes O
DP Slave
Services
– Status/Modify;
Program via
PROFIBUS
Routing
Yes, can be activated
Device master file Sie3802f.gsg
Transmission rate ... up to 12 Mbps
Transfer memory 244 bytes I/244 bytes O
– Address areas max. 32 with max. 32 bytes
each
Dimensions
Assembly dimension
BHT mm
(mm)
80125130
Weight Approx. 0.53 kg
Programming
Programming language STEP 7
Stored instructions See Instruction List
Nesting levels 8
System functions (SFCs) See Instruction List
System function blocks
(SFBs)
See Instruction List
User program security Password protection
Voltages, Currents
Power supply 24V DC
Permissible range 20.4 to 28.8 V
Current consumption (idle) typical 0.9 A
Inrush current typical 8A
l
2
t 0.4 A
2
s
External fusing for supply
lines (recommendation)
Circuit breaker; 2 A,
Type B or C
PD supply at MPI (15 to
30V DC)
max. 200 mA
Power losses typical 10 W
Battery Yes
Backup margin at 25
C and continuous CPU
buffering
min. 1 year
Battery shelf life at
25C
approx. 5 years
Accumulator Yes
– at 0 to 25C Approx. 4 weeks
– at 40 C Approx. 3 weeks
– at 60 C Approx. 1 week
Battery charging time Approx. 1 hour
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