SIMATIC S7-300 – CPU 312 – Siemens PLC

USD $ 419.46

SKU: 6ES7312-1AE14-0AB0

CPU 312, the smallest S7-300 CPU. This is ideally suited to simple applications in which the advantages of TIA such as integrated communication, data management and diagnostics can however be utilized. Networking is possible using MPI or by means of CPs, the standard mode of application is, however, non-networked operation. The I/O is normally connected in a centralized configuration.

Siemens PLC S7-300 Product Specifications:

Article number6ES7312-1AE14-0AB0
CPU312, 32KB
General information
HW functional status1
Firmware versionV3.3
Engineering with
● Programming packageSTEP 7 V5.5 + SP1 or higher or STEP 7 V5.2 + SP1 or higher with HSP 218
Supply voltage
Rated value (DC)24 V
permissible range, lower limit (DC)19.2 V
permissible range, upper limit (DC)28.8 V
external protection for power supply lines (recommendation)2 A min.
Mains buffering
● Mains/voltage failure stored energy time5 ms
● Repeat rate, min.1 s
Input current
Current consumption (rated value)650 mA
Current consumption (in no-load operation), typ.140 mA
Inrush current, typ.3.5 A
I²t1 A²·s
Power loss
Power loss, typ.4 W
Work memory
● integrated32 kbyte
● expandableNo
Load memory
● Plug-in (MMC)Yes
● Plug-in (MMC), max.8 Mbyte
● Data management on MMC (after last programming), min.10 y
● presentYes; Guaranteed by MMC (maintenance-free)
● without batteryYes; Program and data
CPU processing times
for bit operations, typ.0.1 µs
for word operations, typ.0.24 µs
for fixed point arithmetic, typ.0.32 µs
for floating point arithmetic, typ.1.1 µs
Number of blocks (total)1 024; (DBs, FCs, FBs); the maximum number of loadable blocks can be reduced by the MMC used.
● Number, max.1 024; Number range: 1 to 16000
● Size, max.32 kbyte
● Number, max.1 024; Number range: 0 to 7999
● Size, max.32 kbyte
● Number, max.1 024; Number range: 0 to 7999
● Size, max.32 kbyte
● Number, max.see instruction list
● Size, max.32 kbyte
● Number of free cycle OBs1; OB 1
● Number of time alarm OBs1; OB 10
● Number of delay alarm OBs2; OB 20, 21
● Number of cyclic interrupt OBs4; OB 32, 33, 34, 35
● Number of process alarm OBs1; OB 40
● Number of startup OBs1; OB 100
● Number of asynchronous error OBs4; OB 80, 82, 85, 87
● Number of synchronous error OBs2; OB 121, 122
Nesting depth
● per priority class16
● additional within an error OB4
Counters, timers and their retentivity
S7 counter
● Number256
— adjustableYes
— lower limit0
— upper limit255
— presetZ 0 to Z 7
Counting range
— lower limit0
— upper limit999
IEC counter
● presentYes
● TypeSFB
● NumberUnlimited (limited only by RAM capacity)
S7 times
● Number256
— adjustableYes
— lower limit0
— upper limit255
— presetNo retentivity
Time range
— lower limit10 ms
— upper limit9 990 s
IEC timer
● presentYes
● TypeSFB
● NumberUnlimited (limited only by RAM capacity)
Data areas and their retentivity
Retentive data area (incl. timers, counters, flags), max.32 kbyte
● Size, max.256 byte
● Retentivity availableYes; MB 0 to MB 255
● Retentivity presetMB 0 to MB 15
● Number of clock memories8; 1 memory byte
Data blocks
● Retentivity adjustableYes; via non-retain property on DB
● Retentivity presetYes
Local data
● per priority class, max.32 kbyte; Max. 2 KB per block
Address area
I/O address area
● Inputs1 024 byte
● Outputs1 024 byte
Process image
● Inputs1 024 byte
● Outputs1 024 byte
● Inputs, adjustable1 024 byte
● Outputs, adjustable1 024 byte
● Inputs, default128 byte
● Outputs, default128 byte
Digital channels
● Inputs256
— of which central256
● Outputs256
— of which central256
Analog channels
● Inputs64
— of which central64
● Outputs64
— of which central64
Hardware configuration
Number of expansion units, max.0
Number of DP masters
● integrated0
● via CP4
Number of operable FMs and CPs (recommended)
● FM8
● CP, PtP8
● CP, LAN4
● Racks, max.1
● Modules per rack, max.8
Time of day
● Software clockYes
● retentive and synchronizableNo; Buffered: No, Can be synchronized: Yes
● Deviation per day, max.10 s; Typ.: 2 s
● Behavior of the clock following POWER-ONthe clock continues at the time of day it had when power was switched off
Operating hours counter
● Number1
● Number/Number range0
● Range of values0 to 2^31 hours (when using SFC 101)
● Granularity1 h
● retentiveYes; Must be restarted at each restart
Clock synchronization
● supportedYes
● to MPI, masterYes
● to MPI, slaveYes
● in AS, masterYes
● in AS, slaveNo
Digital inputs
Number of digital inputs0
Digital outputs
Number of digital outputs0
Analog inputs
Number of analog inputs0
Analog outputs
Number of analog outputs0
Number of industrial Ethernet interfaces0
Number of PROFINET interfaces0
Number of RS 485 interfaces1; MPI
Number of RS 422 interfaces0
1. Interface
Interface typeIntegrated RS 485 interface
Interface types
● RS 485Yes
● Output current of the interface, max.200 mA
● MPIYes
● PROFIBUS DP masterNo
● Point-to-point connectionNo
● Transmission rate, max.187.5 kbit/s
— PG/OP communicationYes
— RoutingNo
— Global data communicationYes
— S7 basic communicationYes
— S7 communicationYes; Only server, configured on one side
— S7 communication, as clientNo
— S7 communication, as serverYes
communication functions / header
PG/OP communicationYes
Data record routingNo
Global data communication
● supportedYes
● Number of GD loops, max.8
● Number of GD packets, max.8
● Number of GD packets, transmitter, max.8
● Number of GD packets, receiver, max.8
● Size of GD packets, max.22 byte
● Size of GD packet (of which consistent), max.22 byte
S7 basic communication
● supportedYes
● User data per job, max.76 byte
● User data per job (of which consistent), max.76 byte; 76 bytes (with X_SEND or X_RCV); 64 bytes (with X_PUT or X_GET as server)
S7 communication
● supportedYes
● as serverYes
● as clientYes; Via CP and loadable FB
● User data per job, max.180 byte; With PUT/GET
● User data per job (of which consistent), max.240 byte; as server
S5 compatible communication
● supportedYes; via CP and loadable FC
Number of connections
● overall6
● usable for PG communication5
— reserved for PG communication1
— adjustable for PG communication, min.1
— adjustable for PG communication, max.5
● usable for OP communication5
— reserved for OP communication1
— adjustable for OP communication, min.1
— adjustable for OP communication, max.5
● usable for S7 basic communication2
— reserved for S7 basic communication0
— adjustable for S7 basic communication, min.0
— adjustable for S7 basic communication, max.2
S7 message functions
Number of login stations for message functions, max.6; Depending on the configured connections for PG/OP and S7 basic communication
Process diagnostic messagesYes
simultaneously active Alarm-S blocks, max.300
Test commissioning functions
Status blockYes; Up to 2 simultaneously
Single stepYes
Number of breakpoints4
● Status/control variableYes
● VariablesInputs, outputs, memory bits, DB, times, counters
● Number of variables, max.30
— of which status variables, max.30
— of which control variables, max.14
● ForcingYes
● Forcing, variablesInputs, outputs
● Number of variables, max.10
Diagnostic buffer
● presentYes
● Number of entries, max.500
— adjustableNo
— of which powerfail-proof100; Only the last 100 entries are retained
● Number of entries readable in RUN, max.499
— adjustableYes; From 10 to 499
— preset10
Service data
● can be read outYes
Ambient conditions
Ambient temperature during operation
● min.0 °C
● max.60 °C
configuration / header
Configuration software
● STEP 7Yes; V5.2 SP1 or higher with HW update
configuration / programming / header
● Command setsee instruction list
● Nesting levels8
● System functions (SFC)see instruction list
● System function blocks (SFB)see instruction list
Programming language
— LADYes
— FBDYes
— STLYes
— SCLYes
— HiGraph®Yes
Know-how protection
● User program protection/password protectionYes
● Block encryptionYes; With S7 block Privacy
Width40 mm
Height125 mm
Depth130 mm
Weight, approx.270 g
Weight0.305 kg
Dimensions13.1 × 15.1 × 5.1 cm


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