CPUs
1-72
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Configuration
Rack max. 4
Modules per module rack max. 8
Number of DP masters
integral 2
via CP 2
S7 message functions
Simultaneously active
Interrupt S function blocks
and
Interrupt D function blocks
max. 100
Time
Real-time clock Yes
Backed-up Yes
Accuracy See Section 1.1.6
Operating hours counter 8
Number 0 to 7
Value range 0 to 32767 hours
Selectivity 1 hour
Retentive Yes
Clock synchronisation Yes
On PLC Master/Slave
via MPI
via DP
Master/Slave
Master/Slave
Testing and commissioning functions
Status/Modify Variables Yes
Variable Inputs, outputs, flags, DBs,
timers, counters
Number max. 70
Force Yes
Variable Inputs, outputs, flags,
peripheral inputs, peripheral
outputs
Number max. 256
Monitor block Yes
Single sequence
Breakpoint
Yes
4
Diagnostic buffer
Number of entries
(non-alterable)
100
Communication functions
PD/OP communication Yes
Global data communication Yes
Number of GD packets
– Sender 1
– Receiver 2
Size of GD packets 54 bytes
– Number of which
consistent
32 bytes
S7 basic communication Yes
User data per job max. 76 bytes
– Number of which
consistent
76 bytes
S7 communication Yes (server)
User data per job max. 160 bytes
– Number of which
consistent
Byte, Word, Double word
S7-compatible
communication
Yes (via CP and loadable
FC)
User data per job Dependent on CP
– Number of which
consistent
Dependent on CP
Standard communication Yes (via CP and loadable
FC)
User data per job Dependent on CP
– Number of which
consistent
Dependent on CP
Interfaces
1. Interface
Functionality
MPI Yes
DP Master Yes
DP Slave Yes
Direct data exchange Yes
Default setting MPI
Electrically isolated Yes
Number of connections max. 32;
– Of these, the
following are
reserved:
1 PD connection
1 OP connection
MPI
Services
– PD/OP
communication
Yes
– Global data
communication
Yes
– S7 basic
communication
Yes
– S7 communication Yes (server)
Transmission rates Up to 12 Mbps
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