Image is for illustrative purposes only. Please refer to product description.
- Manufacturer
- Siemens
- Manufacturer part number
- 6ES7312-1AE14-0AB0
- Product family
- SIMATIC S7-300 PLC Modules
- Category
- PLCs and I/O › CPU and processor modules
- Technical datasheet
- Data sheet
Specifications
| Attribute | Value |
|---|---|
| Type | PLC CPU |
| Manufacturer lifecycle | Discontinued |
| 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 |
Show all 203 specificationsShow fewer specifications
| 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 |
| 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 / Inputs / of which central | 256 |
| Digital channels / Outputs | 256 |
| Digital channels / Outputs / of which central | 256 |
| Analog channels / Inputs | 64 |
| Analog channels / Inputs / of which central | 64 |
| Analog channels / Outputs | 64 |
| Analog channels / Outputs / 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 / usable for PG communication / reserved for PG communication | 1 |
| Number of connections / usable for PG communication / adjustable for PG communication, min. | 1 |
| Number of connections / usable for PG communication / adjustable for PG communication, max. | 5 |
| Number of connections / usable for OP communication | 5 |
| Number of connections / usable for OP communication / reserved for OP communication | 1 |
| Number of connections / usable for OP communication / adjustable for OP communication, min. | 1 |
| Number of connections / usable for OP communication / adjustable for OP communication, max. | 5 |
| Number of connections / usable for S7 basic communication | 2 |
| Number of connections / usable for S7 basic communication / reserved for S7 basic communication | 0 |
| Number of connections / usable for S7 basic communication / adjustable for S7 basic communication, min. | 0 |
| Number of connections / usable for S7 basic communication / 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 / Number of variables, max. / of which status variables, max. | 30 |
| Status/control / Number of variables, max. / 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 / Number of entries, max. / can be set | No |
| Diagnostic buffer / Number of entries, max. / of which powerfail-proof | 100; Only the last 100 entries are retained |
| Diagnostic buffer / Number of entries readable in RUN, max. | 499 |
| Diagnostic buffer / Number of entries readable in RUN, max. / can be set | Yes; From 10 to 499 |
| Diagnostic buffer / Number of entries readable in RUN, max. / 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 |
| Phase-out announced (PM400) | 1 October 2023 |
| Product cancellation (PM410) | 1 October 2025 |
| Spare part | Yes, supplied by Siemens as a spare part only |
Description
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.
Application: PLC controller
Used with: SIMATIC S7-300 rack (S7-300 backplane bus)
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.
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
Documents and Resources
Associated Products
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 | 6ES7318-3EL01-0AB0Siemens | CPU 319-3 PN/DP, 2 MB, MPI/DP, DP and PROFINET | In stock | View | |
 | 6ES7315-6FF04-0AB0Siemens | CPU 315F-2 DP fail-safe, 384 KB, MPI and DP | In stock | View |
Product Questions
Is the 6ES7312-1AE14-0AB0 discontinued?
Yes. Its manufacturer lifecycle status is Discontinued.
Can another Siemens SIMATIC S7-300 part replace it?
Potential replacements must be checked against the required ratings, dimensions and connections. Sharing a family name does not establish interchangeability.
Do you ship worldwide?
Yes. TimControls ships worldwide. Parts usually ship within 3 to 7 working days of order confirmation, and the exact lead time and shipping options are stated on your quote. Include your delivery country and postal code when you ask for a quote.
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