6ES7312-1AE14-0AB0
Siemens CPU 312, 32 KB, MPI
Read from the product label
- Maker
- Siemens
- Part no.
- 6ES7312-1AE14-0AB0
- Serial / rev.
- as printed on your unit
Illustration of the unit type, not a photo of this part.
Delivery options
Siemens SIMATIC S7-300 CPU 312: central processing unit with MPI, 32 KB work memory, 24 V DC; Micro Memory Card required.
- Manufacturer
- Siemens
- Manufacturer part no.
- 6ES7312-1AE14-0AB0
- Product family
- SIMATIC S7-300 PLC Modules
- Type
- PLC CPU
- Lifecycle
- Discontinued: product cancellation (Siemens SiePortal), spare part only
- OEM successor
- Not stated
- Technical datasheet
- Data sheet
Technical specifications
- Manufacturer
- Siemens
- Manufacturer part no.
- 6ES7312-1AE14-0AB0
- Type
- PLC CPU
- Application
- PLC controller
- Used with
- SIMATIC S7-300 rack (S7-300 backplane bus)
- Product type designation
- CPU 312
- HW functional status
- 01
- Firmware version
- V3.3
- Engineering with / Programming package
- STEP 7 V5.5 + SP1 or higher or STEP 7 V5.2 + SP1 or higher with HSP 218
- Supply voltage / Rated value (DC)
- 24 V
- Supply voltage / permissible range, lower limit (DC)
- 19.2 V
- Supply voltage / 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 time
- 5 ms
- Mains buffering / Repeat rate, min.
- 1 s
- Input current / Current consumption (rated value)
- 650 mA
- Input current / Current consumption (in no-load operation), typ.
- 140 mA
- Input current / Inrush current, typ.
- 3.5 A
- Input current / I²t
- 1 A²·s
- Power loss, typ.
- 4 W
- Work memory / integrated
- 32 kbyte
- Work memory / expandable
- No
- Load memory / Plug-in (MMC)
- Yes
- Load memory / Plug-in (MMC), max.
- 8 Mbyte
- Load memory / Data management on MMC (after last programming), min.
- 10 a
- Backup / present
- Yes; Guaranteed by MMC (maintenance-free)
- Backup / without battery
- Yes; Program and data
- CPU processing times / for bit operations, typ.
- 0.1 µs
- CPU processing times / for word operations, typ.
- 0.24 µs
- CPU processing times / for fixed point arithmetic, typ.
- 0.32 µs
Show all 203 specificationsShow fewer
- CPU processing times / for floating point arithmetic, typ.
- 1.1 µs
- CPU-blocks / Number of elements (total)
- 1 024; (DBs, FCs, FBs); the maximum number of loadable blocks can be reduced by the MMC used.
- DB / Number, max.
- 1 024; Number range: 1 to 16000
- DB / Size, max.
- 32 kbyte
- FB / Number, max.
- 1 024; Number range: 0 to 7999
- FB / Size, max.
- 32 kbyte
- FC / Number, max.
- 1 024; Number range: 0 to 7999
- FC / Size, max.
- 32 kbyte
- OB / Number, max.
- see instruction list
- OB / Size, max.
- 32 kbyte
- OB / Number of free cycle OBs
- 1; OB 1
- OB / Number of time alarm OBs
- 1; OB 10
- OB / Number of delay alarm OBs
- 2; OB 20, 21
- OB / Number of cyclic interrupt OBs
- 4; OB 32, 33, 34, 35
- OB / Number of process alarm OBs
- 1; OB 40
- OB / Number of startup OBs
- 1; OB 100
- OB / Number of asynchronous error OBs
- 4; OB 80, 82, 85, 87
- OB / Number of synchronous error OBs
- 2; OB 121, 122
- Nesting depth / per priority class
- 16
- Nesting depth / additional within an error OB
- 4
- S7 counter / Number
- 256
- S7 counter / Retentivity / adjustable
- Yes
- S7 counter / Retentivity / preset
- Z 0 to Z 7
- S7 counter / Counting range / lower limit
- 0
- S7 counter / Counting range / upper limit
- 999
- IEC counter / present
- Yes
- IEC counter / Type
- SFB
- IEC counter / Number
- Unlimited (limited only by RAM capacity)
- S7 timer / Number
- 256
- S7 timer / Retentivity / adjustable
- Yes
- S7 timer / Retentivity / preset
- No retentivity
- S7 timer / Time range / lower limit
- 10 ms
- S7 timer / Time range / upper limit
- 9 990 s
- IEC timer / present
- Yes
- IEC timer / Type
- SFB
- IEC timer / Number
- Unlimited (limited only by RAM capacity)
- Retentive data area (incl. timers, counters, flags), max.
- 32 kbyte
- Flag / Size, max.
- 256 byte
- Flag / Retentivity available
- Yes; MB 0 to MB 255
- Flag / Retentivity preset
- MB 0 to MB 15
- Flag / Number of clock memories
- 8; 1 memory byte
- Data blocks / Retentivity adjustable
- Yes; via non-retain property on DB
- Data blocks / Retentivity preset
- Yes
- Local data / per priority class, max.
- 32 kbyte; Max. 2 KB per block
- I/O address area / Inputs
- 1 024 byte
- I/O address area / Outputs
- 1 024 byte
- Process image / Inputs
- 1 024 byte
- Process image / Outputs
- 1 024 byte
- Process image / Inputs, adjustable
- 1 024 byte
- Process image / Outputs, adjustable
- 1 024 byte
- Process image / Inputs, default
- 128 byte
- Process image / Outputs, default
- 128 byte
- Digital channels / Inputs
- 256
- Digital channels / of which central
- 256
- Digital channels / Outputs
- 256
- Digital channels / of which central
- 256
- Analog channels / Inputs
- 64
- Analog channels / of which central
- 64
- Analog channels / Outputs
- 64
- Analog channels / of which central
- 64
- Hardware configuration / Number of expansion units, max.
- 0
- Number of DP masters / integrated
- 0
- Number of DP masters / via CP
- 4
- Number of operable FMs and CPs (recommended) / FM
- 8
- Number of operable FMs and CPs (recommended) / CP, PtP
- 8
- Number of operable FMs and CPs (recommended) / CP, LAN
- 4
- Rack / Racks, max.
- 1
- Rack / Modules per rack, max.
- 8
- Clock / Software clock
- Yes
- Clock / retentive and synchronizable
- No; Buffered: No, Can be synchronized: Yes
- Clock / Deviation per day, max.
- 10 s; Typ.: 2 s
- Clock / Behavior of the clock following POWER-ON
- the clock continues at the time of day it had when power was switched off
- Operating hours counter / Number
- 1
- Operating hours counter / Number/Number range
- 0
- Operating hours counter / Range of values
- 0 to 2^31 hours (when using SFC 101)
- Operating hours counter / Granularity
- 1 h
- Operating hours counter / retentive
- Yes; Must be restarted at each restart
- Clock synchronization / supported
- Yes
- Clock synchronization / to MPI, master
- Yes
- Clock synchronization / on MPI, device
- Yes
- Clock synchronization / in AS, master
- Yes
- Clock synchronization / in AS, device
- No
- Number of digital inputs
- 0
- Number of digital outputs
- 0
- Number of analog inputs
- 0
- Number of PROFINET interfaces
- 0
- Number of RS 485 interfaces
- 1; MPI
- Number of RS 422 interfaces
- 0
- 1. Interface / Interface type
- Integrated RS 485 interface
- 1. Interface / Isolated
- No
- Interface types / RS 485
- Yes
- Interface types / Output current of the interface, max.
- 200 mA
- Protocols / MPI
- Yes
- Protocols / PROFIBUS DP master
- No
- Protocols / PROFIBUS DP device
- No
- Protocols / Point-to-point connection
- No
- MPI / Transmission rate, max.
- 187.5 kbit/s
- MPI / Services / PG/OP communication
- Yes
- MPI / Services / Routing
- No
- MPI / Services / Global data communication
- Yes
- MPI / Services / S7 basic communication
- Yes
- MPI / Services / S7 communication
- Yes; Only server, configured on one side
- MPI / Services / S7 communication, as client
- No
- MPI / Services / S7 communication, as server
- Yes
- Protocols / PROFIsafe
- No
- PG/OP communication
- Yes
- Communication functions / Data record routing
- No
- Global data communication / supported
- Yes
- Global data communication / Number of GD loops, max.
- 8
- Global data communication / Number of GD packets, max.
- 8
- Global data communication / Number of GD packets, transmitter, max.
- 8
- Global data communication / Number of GD packets, receiver, max.
- 8
- Global data communication / Size of GD packets, max.
- 22 byte
- Global data communication / Size of GD packet (of which consistent), max.
- 22 byte
- S7 basic communication / supported
- Yes
- S7 basic communication / User data per job, max.
- 76 byte
- S7 basic communication / 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 / supported
- Yes
- S7 communication / as server
- Yes
- S7 communication / as client
- Yes; Via CP and loadable FB
- S7 communication / User data per job, max.
- 180 byte; With PUT/GET
- S7 communication / User data per job (of which consistent), max.
- 240 byte; as server
- S5 compatible communication / supported
- Yes; via CP and loadable FC
- Number of connections / overall
- 6
- Number of connections / usable for PG communication
- 5
- Number of connections / reserved for PG communication
- 1
- Number of connections / adjustable for PG communication, min.
- 1
- Number of connections / adjustable for PG communication, max.
- 5
- Number of connections / usable for OP communication
- 5
- Number of connections / reserved for OP communication
- 1
- Number of connections / adjustable for OP communication, min.
- 1
- Number of connections / adjustable for OP communication, max.
- 5
- Number of connections / usable for S7 basic communication
- 2
- Number of connections / reserved for S7 basic communication
- 0
- Number of connections / adjustable for S7 basic communication, min.
- 0
- Number of connections / 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
- S7 message functions / Process diagnostic messages
- Yes
- S7 message functions / simultaneously active Alarm_S blocks, max.
- 300
- Test commissioning functions / Status block
- Yes; Up to 2 simultaneously
- Test commissioning functions / Single step
- Yes
- Test commissioning functions / Number of breakpoints
- 4
- Status/control / Status/control variable
- Yes
- Status/control / Variables
- Inputs, outputs, memory bits, DB, times, counters
- Status/control / Number of variables, max.
- 30
- Status/control / of which status variables, max.
- 30
- Status/control / of which control variables, max.
- 14
- Forcing / Forcing
- Yes
- Forcing / Forcing, variables
- Inputs, outputs
- Forcing / Number of variables, max.
- 10
- Diagnostic buffer / present
- Yes
- Diagnostic buffer / Number of entries, max.
- 500
- Diagnostic buffer / can be set
- No
- Diagnostic buffer / of which powerfail-proof
- 100; Only the last 100 entries are retained
- Diagnostic buffer / Number of entries readable in RUN, max.
- 499
- Diagnostic buffer / can be set
- Yes; From 10 to 499
- Diagnostic buffer / preset
- 10
- Service data / Can be read out
- Yes
- Ambient temperature during operation / min.
- 0 °C
- Ambient temperature during operation / max.
- 60 °C
- Configuration software / STEP 7
- Yes; V5.2 SP1 or higher with HW update
- Programming / Command set
- see instruction list
- Programming / Nesting levels
- 8
- Programming / System functions (SFC)
- see instruction list
- Programming / System function blocks (SFB)
- see instruction list
- Programming / Programming language / LAD
- Yes
- Programming / Programming language / FBD
- Yes
- Programming / Programming language / STL
- Yes
- Programming / Programming language / SCL
- Yes
- Programming / Programming language / GRAPH
- Yes
- Programming / Programming language / HiGraph®
- Yes
- Know-how protection / User program protection/password protection
- Yes
- Know-how protection / Block encryption
- Yes; With S7 block Privacy
Technical documents (1)
Key features
- 32 KB integrated work memory; program on a Micro Memory Card up to 8 MB
- MPI interface
- Bit operations 0.1 µs typical
- 24 V DC supply
- Discontinued by Siemens on 1 October 2025; spare part only
About the Siemens 6ES7312-1AE14-0AB0
The Siemens 6ES7312-1AE14-0AB0 is the CPU 312, a small S7-300 CPU. Its data sheet gives 32 KB of integrated work memory, a Micro Memory Card for the program (up to 8 MB), an MPI interface, bit operations in 0.1 µs and a 24 V DC supply. Siemens's data sheet marks it as a spare part. Siemens names no direct successor for the order number; its route forward is migration to the S7-1500.
What is the 6ES7312-1AE14-0AB0 used for?
It controls small machines with a single S7-300 rack of I/O, programmed and connected to panels over MPI. A failed CPU stops the machine.
Lifecycle and successor
Discontinued: product cancellation (Siemens SiePortal), spare part only.
Before you order
What to photograph or confirm so the right unit is quoted.
Check the full order number and the firmware version on the CPU's label. The Micro Memory Card holding the program is a separate part; send its order number and size too.
Alternatives for 6ES7312-1AE14-0AB0
The manufacturer’s named successor and other parts in the same family. None is a drop-in replacement without checking wiring, I/O and configuration for your installation.
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