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  • 300S+

314-2BG23 - CPUs | CPUs STEP7 programmable, standard

Order no.



General information

FeaturesPowered by SPEED7
Work memory [KB]: 256...1.024
Interface [RJ45]: Ethernet PG/OP communication
Interface [2x RS485]: MPI, PROFIBUS slave, PtP: ASCII, STX/ETX, 3964(R), USS master, Modbus master/slave
SD/MMC card slot with locking, up to 32 modules stackable, programmable with WinPLC7, SIMATIC Manager and TIA Portal

Technical data power supply

Power supply (rated value)DC 24 V
Power supply (permitted range)DC 20.4...28.8 V
Reverse polarity protection
Current consumption (no-load operation)180 mA
Current consumption (rated value)900 mA
Inrush current8 A
I²t0.7 A²s
Max. current drain at backplane bus3 A
Max. current drain load supply-
Power loss6 W

Load and working memory

Load memory, integrated1 MB
Load memory, maximum1 MB
Work memory, integrated256 KB
Work memory, maximal1 MB
Memory divided in 50% program / 50% data
Memory card slotSD/MMC-Card with max. 2 GB

Hardware configuration

Racks, max.4
Modules per rack, max.8 in multiple-, 32 in a single-rack configuration
Number of integrated DP master-
Number of DP master via CP4
Operable function modules8
Operable communication modules PtP8
Operable communication modules LAN8

Status information, alarms, diagnostics

Status displayyes
Process alarmno
Diagnostic interruptno
Diagnostic functionsno
Diagnostics information read-outpossible
Supply voltage displaygreen LED
Group error displayred SF LED
Channel error displaynone

Command processing times

Bit instructions, min.0.02 µs
Word instruction, min.0.02 µs
Double integer arithmetic, min.0.02 µs
Floating-point arithmetic, min.0.12 µs

Timers/Counters and their retentive characteristics

Number of S7 counters512
S7 counter remanenceadjustable 0 up to 256
S7 counter remanence adjustableC0 .. C7
Number of S7 times512
S7 times remanenceadjustable 0 up to 256
S7 times remanence adjustablenot retentive

Data range and retentive characteristic

Number of flags8192 Byte
Bit memories retentive characteristic adjustableadjustable 0 up to 2048
Bit memories retentive characteristic presetMB0 .. MB15
Number of data blocks4095
Max. data blocks size64 KB
Number range DBs1 ... 4095
Max. local data size per execution level1024 Byte
Max. local data size per block1024 Byte


Number of OBs15
Maximum OB size64 KB
Total number DBs, FBs, FCs-
Number of FBs2048
Maximum FB size64 KB
Number range FBs0 ... 2047
Number of FCs2048
Maximum FC size64 KB
Number range FCs0 ... 2047
Maximum nesting depth per priority class8
Maximum nesting depth additional within an error OB4


Real-time clock buffered
Clock buffered period (min.)6 w
Type of bufferingVanadium Rechargeable Lithium Battery
Load time for 50% buffering period20 h
Load time for 100% buffering period48 h
Accuracy (max. deviation per day)10 s
Number of operating hours counter8
Clock synchronization
Synchronization via MPIMaster/Slave
Synchronization via Ethernet (NTP)no

Address areas (I/O)

Input I/O address area2048 Byte
Output I/O address area2048 Byte
Process image adjustable-
Input process image preset128 Byte
Output process image preset128 Byte
Input process image maximal128 Byte
Output process image maximal128 Byte
Digital inputs16384
Digital outputs16385
Digital inputs central1024
Digital outputs central1024
Integrated digital inputs-
Integrated digital outputs-
Analog inputs1024
Analog outputs1024
Analog inputs, central256
Analog outputs, central256
Integrated analog inputs-
Integrated analog outputs-

Communication functions

PG/OP channel
Global data communication
Number of GD circuits, max.8
Size of GD packets, max.22 Byte
S7 basic communication
S7 basic communication, user data per job76 Byte
S7 communication
S7 communication as server
S7 communication as client-
S7 communication, user data per job160 Byte
Number of connections, max.32

Functionality Sub-D interfaces

Type of interfaceRS485
ConnectorSub-D, 9-pin, female
Electrically isolated-
MP²I (MPI/RS232)-
DP master-
DP slave-
Point-to-point interface-
5V DC Power supplymax. 90mA, non-isolated
24V DC Power supplymax. 100mA, non-isolated

Type of interfaceRS485
ConnectorSub-D, 9-pin, female
Electrically isolated
MP²I (MPI/RS232)-
DP master-
DP slaveyes
Point-to-point interface
5V DC Power supplymax. 90mA, isolated
24V DC Power supplymax. 100mA, non-isolated

Functionality MPI

Number of connections, max.32
PG/OP channel
Global data communication
S7 basic communication
S7 communication
S7 communication as server
S7 communication as client-
Transmission speed, min.19.2 kbit/s
Transmission speed, max.187.5 kbit/s

Functionality PROFIBUS master

Number of connections, max.-
PG/OP channel-
S7 basic communication-
S7 communication-
S7 communication as server-
S7 communication as client-
Activation/deactivation of DP slaves-
Direct data exchange (slave-to-slave communication)-
Transmission speed, min.-
Transmission speed, max.-
Number of DP slaves, max.-
Address range inputs, max.-
Address range outputs, max.-
User data inputs per slave, max.-
User data outputs per slave, max.-

Functionality PROFIBUS slave

Number of connections, max.-
PG/OP channel-
S7 communication-
S7 communication as server-
S7 communication as client-
Direct data exchange (slave-to-slave communication)-
Transmission speed, min.9.6 kbit/s
Transmission speed, max.12 Mbit/s
Automatic detection of transmission speed-
Transfer memory inputs, max.244 Byte
Transfer memory outputs, max.244 Byte
Address areas, max.32
User data per address area, max.32 Byte

Functionality RJ45 interfaces

Type of interfaceEthernet 10/100 MBit
Electrically isolated
PG/OP channel
Number of connections, max.4
Productive connections-

Point-to-point communication

PtP communication
Interface isolated
RS232 interface-
RS422 interface-
RS485 interface
ConnectorSub-D, 9-pin, female
Transmission speed, min.150 bit/s
Transmission speed, max.115.5 kbit/s
Cable length, max.500 m

Point-to-point protocol

ASCII protocol
STX/ETX protocol
3964(R) protocol
RK512 protocol-
USS master protocol
Modbus master protocol
Modbus slave protocol-
Special protocols-


MountingRail System 300

Mechanical data

Dimensions (WxHxD)40 mm x 125 mm x 120 mm
Net weight235 g
Weight including accessories-
Gross weight-

Environmental conditions

Operating temperature0 °C to 60 °C
Storage temperature-25 °C to 70 °C


UL certificationyes
KC certificationyes