6ES7312-5BF04-0AB0
Siemens CPU 312C compact, 64 KB, 10 DI/6 DO, MPI
Read from the product label
- Maker
- Siemens
- Part no.
- 6ES7312-5BF04-0AB0
- Serial / rev.
- as printed on your unit
Image is for illustrative purposes only. Please refer to product description.
Delivery options
Siemens SIMATIC S7-300 CPU 312C: compact CPU with 64 KB work memory, an MPI interface, 10 digital inputs and 6 digital outputs, two 10 kHz high-speed counters and a 24 V DC supply; Micro Memory Card required.
- Manufacturer
- Siemens
- Manufacturer part no.
- 6ES7312-5BF04-0AB0
- Product family
- SIMATIC S7-300 PLC Modules
- Type
- PLC CPU
- Lifecycle
- Discontinued
- OEM successor
- Not stated
- Technical datasheet
- Data sheet
Technical specifications
- Manufacturer
- Siemens
- Manufacturer part no.
- 6ES7312-5BF04-0AB0
- Type
- PLC CPU
- Application
- PLC controller
- Used with
- SIMATIC S7-300 rack (S7-300 backplane bus)
- Product type designation
- CPU 312C
- HW functional status
- 01
- Firmware version
- V3.3
- Engineering with / Programming package
- STEP 7 V5.5 + SP1 or higher or STEP 7 V5.3 + SP2 or higher with HSP 203
- 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)
- Miniature circuit breaker, type C; min. 2 A; miniature circuit breaker type B, min. 4 A
- Mains buffering / Mains/voltage failure stored energy time
- 5 ms
- Mains buffering / Repeat rate, min.
- 1 s
- Load voltage L+ / Digital outputs / Rated value (DC)
- 24 V
- Load voltage L+ / Digital outputs / Reverse polarity protection
- No
- Input current / Current consumption (rated value)
- 570 mA
- Input current / Current consumption (in no-load operation), typ.
- 90 mA
- Input current / Inrush current, typ.
- 5 A
- Input current / I²t
- 0.7 A²·s
- Digital outputs / from load voltage L+, max.
- 25 mA
- Power loss, typ.
- 8 W
- Work memory / integrated
- 64 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
Show all 278 specificationsShow fewer
- 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.
- 64 kbyte
- FB / Number, max.
- 1 024; Number range: 0 to 7999
- FB / Size, max.
- 64 kbyte
- FC / Number, max.
- 1 024; Number range: 0 to 7999
- FC / Size, max.
- 64 kbyte
- OB / Number, max.
- see instruction list
- OB / Size, max.
- 64 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.
- 64 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. 2048 bytes per block
- I/O address area / Inputs
- 1 024 byte
- I/O address area / Outputs
- 1 024 byte
- I/O address area / of which distributed / Inputs
- none
- I/O address area / of which distributed / Outputs
- none
- 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
- 266
- Digital channels / Inputs / of which central
- 266
- Digital channels / Outputs
- 262
- Digital channels / Outputs / of which central
- 262
- 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
- none
- 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
- 10
- Number of digital inputs / of which inputs usable for technological functions
- 8
- Digital inputs / integrated channels (DI)
- 10
- Digital inputs / Input characteristic curve in accordance with IEC 61131, type 1
- Yes
- Number of simultaneously controllable inputs / horizontal installation / up to 40 °C, max.
- 10
- Number of simultaneously controllable inputs / horizontal installation / up to 60 °C, max.
- 5
- Number of simultaneously controllable inputs / vertical installation / up to 40 °C, max.
- 5
- Input voltage / Rated value (DC)
- 24 V
- Input voltage / for signal "0"
- -3 to +5V
- Input voltage / for signal "1"
- +15 to +30 V
- Input current / for signal "1", typ.
- 8 mA
- Input delay (for rated value of input voltage) / for standard inputs / parameterizable
- Yes; 0.1 / 0.3 / 3 / 15 ms (You can reconfigure the input delay of the standard inputs during program runtime. Please note that under certain circumstances your newly set filter time may not be effective until the next filter cycle.)
- Input delay (for rated value of input voltage) / for standard inputs / Rated value
- 3 ms
- Input delay (for rated value of input voltage) / for technological functions / at "0" to "1", max.
- 48 µs; Minimum pulse width/minimum pause between pulses at maximum counting frequency
- Digital inputs / Cable length / shielded, max.
- 1 000 m; 100 m for technological functions
- Digital inputs / Cable length / unshielded, max.
- 600 m; for technological functions: No
- Cable length / for technological functions / shielded, max.
- 100 m; at maximum count frequency
- Cable length / for technological functions / unshielded, max.
- not allowed
- Number of digital outputs
- 6
- Number of digital outputs / of which high-speed outputs
- 2; Notice: You cannot connect the fast outputs of your CPU in parallel
- Digital outputs / integrated channels (DO)
- 6
- Digital outputs / Short-circuit protection
- Yes; Clocked electronically
- Short-circuit protection / Response threshold, typ.
- 1 A
- Digital outputs / Limitation of inductive shutdown voltage to
- L+ (-48 V)
- Controlling a digital input
- Yes
- Switching capacity of the outputs / on lamp load, max.
- 5 W
- Load resistance range / lower limit
- 48 Ω
- Load resistance range / upper limit
- 4 kΩ
- Output voltage / for signal "1", min.
- L+ (-0.8 V)
- Output current / for signal "1" rated value
- 500 mA
- Output current / for signal "1" permissible range, min.
- 5 mA
- Output current / for signal "1" permissible range, max.
- 0.6 A
- Output current / for signal "1" minimum load current
- 5 mA
- Output current / for signal "0" residual current, max.
- 0.5 mA
- Parallel switching of two outputs / for uprating
- No
- Parallel switching of two outputs / for redundant control of a load
- Yes
- Switching frequency / with resistive load, max.
- 100 Hz
- Switching frequency / with inductive load, max.
- 0.5 Hz
- Switching frequency / on lamp load, max.
- 100 Hz
- Switching frequency / of the pulse outputs, with resistive load, max.
- 2.5 kHz
- Total current of the outputs (per group) / horizontal installation / up to 40 °C, max.
- 2 A
- Total current of the outputs (per group) / horizontal installation / up to 60 °C, max.
- 1.5 A
- Total current of the outputs (per group) / vertical installation / up to 40 °C, max.
- 1.5 A
- Digital outputs / Cable length / shielded, max.
- 1 000 m
- Digital outputs / Cable length / unshielded, max.
- 600 m
- Number of analog inputs
- 0
- Analog inputs / integrated channels (AI)
- 0
- Analog outputs / integrated channels (AO)
- 0
- Connectable encoders / 2-wire sensor
- Yes
- Connectable encoders / 2-wire sensor / permissible quiescent current (2-wire sensor), max.
- 1.5 mA
- 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; but via CP and loadable FB
- 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
- Diagnostics indication LED / Status indicator digital input (green)
- Yes
- Diagnostics indication LED / Status indicator digital output (green)
- Yes
- Counter / Number of counters
- 2; See "Technological Functions" manual
- Counter / Counting frequency, max.
- 10 kHz
- Integrated Functions / Frequency measurement
- Yes
- Frequency measurement / Number of frequency meters
- 2; up to 10 kHz (see "Technological Functions" manual)
- Integrated Functions / controlled positioning
- No
- integrated function blocks (closed-loop control)
- No
- Integrated Functions / PID controller
- No
- Integrated Functions / Number of pulse outputs
- 2; Pulse width modulation up to 2.5 kHz (see "Technological Functions" Manual)
- Integrated Functions / Limit frequency (pulse)
- 2.5 kHz
- Potential separation digital inputs / Potential separation digital inputs
- Yes
- Potential separation digital inputs / between the channels
- No
- Potential separation digital inputs / between the channels and backplane bus
- Yes
- Potential separation digital outputs / Potential separation digital outputs
- Yes
- Potential separation digital outputs / between the channels
- No
- Potential separation digital outputs / between the channels and backplane bus
- Yes
- Isolation tested with
- 600 V DC
- Ambient temperature during operation / min.
- 0 °C
- Ambient temperature during operation / max.
- 60 °C
- Configuration software / STEP 7
- Yes; STEP 7 V5.5 + SP1 or higher or STEP 7 V5.3 + SP2 or higher with HSP 203
- Configuration software / STEP 7 Lite
- No
- 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
- Width
- 80 mm
- Height
- 125 mm
- Depth
- 130 mm
- Weight, approx.
- 410 g
Technical documents (1)
Key features
- 64 KB integrated work memory
- 10 digital inputs and 6 digital outputs on the CPU
- 2 high-speed counters (10 kHz)
- MPI interface
- 24 V DC supply; program on a Micro Memory Card
- Siemens lists it as a spare part
About the Siemens 6ES7312-5BF04-0AB0
The Siemens 6ES7312-5BF04-0AB0 is the CPU 312C, the compact CPU of the S7-300. Siemens's data sheet gives it 64 KB of integrated work memory, an MPI interface, and on-board I/O: 10 digital inputs, 6 digital outputs and two high-speed counters at 10 kHz, wired through a 40-pole front connector. It runs on 24 V DC, and the program is held on a Micro Memory Card. Siemens's data sheet marks it as a spare part.
What is the 6ES7312-5BF04-0AB0 used for?
It controls small machines on its own, using its on-board inputs and outputs, and can be extended with S7-300 modules. A failed CPU stops the machine it controls, so a like-for-like replacement is the quickest way back into production.
Lifecycle and successor
Discontinued.
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, and read the program size from the project if you can: a replacement must match or exceed the work memory. The Micro Memory Card (MMC) holding the program is a separate part; send its order number and size too.
Alternatives for 6ES7312-5BF04-0AB0
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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