Siemens SIMATIC S7-300 Series Reference Manual page 81

Interfaces
1. Interface
Functionality
S
MPI Yes
S
DP Master No
S
DP Slave No
S
Galvanically isolated No
MPI
S
Services
– PD/OP Yes
communication
– Global data Yes
communication
– S7 basic Yes
communication
– S7 communication Yes (server)
S
Transmission rates 19.2; 187.5 Kbps
2. Interface
Functionality
S
DP Master Yes
S
DP Slave Yes
– Status/Modify; Yes, can be activated
Program; Routing
S
Direct data exchange Yes
S
Point-to-point No
connection
S
Default setting None
S
Galvanically isolated Yes
DP Master
S
Services
– Equidistance Yes
– SYNC/FREEZE Yes
– Activation/deactivat Yes
ion of DP slaves
S
Transmission rates Up to 12 Mbps
S
Number of DP slaves max. 64
S
Address area max. 1 KB I/1 Kbyte O
S
User data per DP slave max. 244 bytes I and
244 bytes O
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
DP Slave
S
Services
– Status/Modify; Yes, can be activated
Program via
PROFIBUS
Routing
S
Device master file Sie3802f.gsg
S
Transmission rate ... up to 12 Mbps
S
Transfer memory 244 bytes I/244 bytes O
– Address areas max. 32 with max. 32 bytes
each
Dimensions
Assembly dimension 80 125 130
B H T mm
(mm)
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 See Instruction List
(SFBs)
User program security Password protection
Voltages, Currents
Power supply 24V DC
S
Permissible range 20.4 to 28.8 V
Current consumption (idle) typical 0.9 A
Inrush current typical 8A
2
l t 0.4 A
External fusing for supply Circuit breaker; 2 A,
lines (recommendation)
Type B or C
PD supply at MPI (15 to max. 200 mA
30V DC)
Power losses typical 10 W
Battery Yes
S
Backup margin at 25_ min. 1 year
C and continuous CPU
buffering
S
Battery shelf life at approx. 5 years
25_C
Accumulator Yes
– at 0 to 25_C Approx. 4 weeks
– at 40_ C Approx. 3 weeks
at 60 _ C
– Approx. 1 week
S
Battery charging time Approx. 1 hour
CPUs
2
s
1-65