Specifications

CPUs
1-42
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
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
Dimensions
Assembly dimension
BHT (mm)
80125130
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 V to 28.8 V
Current consumption (idle) typical 0.7 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 8 W
Battery Yes
 Backup margin at 25
C and continuous CPU
buffering
min. 1 year
 Battery shelf life at
25C
approx. 5 years
Accumulator Yes
 Clock back-up period
– at 0 to 25C Approx. 4 weeks
– at 40 C Approx. 3 weeks
– at 60  C Approx. 1 week
 Battery charging time Approx. 1 hour