6ES7315-2EH14-0AB0

Siemens CPU 315-2 PN/DP, 384 KB, MPI/DP and PROFINET

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Maker: Siemens
Part no.: 6ES7315-2EH14-0AB0
Serial / rev.: as printed on your unit

Illustration of the unit type, not a photo of this part.

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Siemens SIMATIC S7-300 CPU 315-2 PN/DP: central processing unit with 384 KB work memory, MPI/PROFIBUS DP interface and PROFINET interface with 2-port switch; Micro Memory Card required.

Manufacturer: Siemens
Manufacturer part no.: 6ES7315-2EH14-0AB0
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.: 6ES7315-2EH14-0AB0
Type: PLC CPU
Application: PLC controller
Used with: SIMATIC S7-300 rack (S7-300 backplane bus)
Product type designation: CPU 315-2 PN/DP
HW functional status: 01
Firmware version: V3.2
Product function / Isochronous mode: Yes; Via PROFIBUS DP or PROFINET interface
Engineering with / Programming package: STEP 7 V5.5 or higher
Supply voltage / Rated value (DC): 24 V
Supply voltage / permissible range, lower limit (DC): 20.4 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): 750 mA
Input current / Current consumption (in no-load operation), typ.: 150 mA
Input current / Inrush current, typ.: 4 A
Input current / I²t: 1 A²·s
Power loss, typ.: 4.65 W
Work memory / integrated: 384 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.: 0.05 µs
CPU processing times / for word operations, typ.: 0.09 µs

Show all 339 specifications

CPU processing times / for fixed point arithmetic, typ.: 0.12 µs
CPU processing times / for floating point arithmetic, typ.: 0.45 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 / 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 DPV1 alarm OBs: 3; OB 55, 56, 57
OB / Number of isochronous mode OBs: 1; OB 61
OB / Number of startup OBs: 1; OB 100
OB / Number of asynchronous error OBs: 6; OB 80, 82, 83, 85, 86, 87 (OB83 only for PROFINET IO)
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 / can be set: Yes
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.: 128 kbyte
Flag / Size, max.: 2 048 byte
Flag / Retentivity available: Yes; MB 0 to MB 2 047
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.: 32 768 byte; Max. 2048 bytes per block
I/O address area / Inputs: 2 048 byte
I/O address area / Outputs: 2 048 byte
I/O address area / of which distributed / Inputs: 2 048 byte
I/O address area / of which distributed / Outputs: 2 048 byte
Process image / Inputs: 2 048 byte
Process image / Outputs: 2 048 byte
Process image / Inputs, adjustable: 2 048 byte
Process image / Outputs, adjustable: 2 048 byte
Process image / Inputs, default: 128 byte
Process image / Outputs, default: 128 byte
Subprocess images / Number of subprocess images, max.: 1; With PROFINET IO, the length of the user data is limited to 1600 bytes
Digital channels / Inputs: 16 384
Digital channels / of which central: 1 024
Digital channels / Outputs: 16 384
Digital channels / of which central: 1 024
Analog channels / Inputs: 1 024
Analog channels / of which central: 256
Analog channels / Outputs: 1 024
Analog channels / of which central: 256
Hardware configuration / Number of expansion units, max.: 3
Number of DP masters / integrated: 1
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: 10
Rack / Racks, max.: 4
Rack / Modules per rack, max.: 8
Clock / Hardware clock (real-time): Yes
Clock / retentive and synchronizable: Yes
Clock / Backup time: 6 wk; At 40 °C ambient temperature
Clock / Deviation per day, max.: 10 s; Typ.: 2 s
Clock / Behavior of the clock following POWER-ON: Clock continues running after POWER OFF
Clock / Behavior of the clock following expiry of backup period: 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 / to DP, master: Yes; With DP slave only slave clock
Clock synchronization / on DP, device: Yes
Clock synchronization / in AS, master: Yes
Clock synchronization / in AS, device: Yes
Clock synchronization / on Ethernet via NTP: Yes; As client
Number of digital inputs: 0
Number of digital outputs: 0
Number of analog inputs: 0
Number of PROFINET interfaces: 1; 2 ports (switch) RJ45
Number of RS 485 interfaces: 1; Combined MPI / PROFIBUS DP
Number of RS 422 interfaces: 0
1. Interface / Interface type: Integrated RS 485 interface
1. Interface / Isolated: Yes
Interface types / RS 485: Yes
Interface types / Output current of the interface, max.: 200 mA
Protocols / MPI: Yes
Protocols / PROFIBUS DP master: Yes
Protocols / PROFIBUS DP device: Yes
Protocols / Point-to-point connection: No
MPI / Transmission rate, max.: 12 Mbit/s
MPI / Services / PG/OP communication: Yes
MPI / Services / Routing: Yes
MPI / Services / Global data communication: Yes
MPI / Services / S7 basic communication: Yes
MPI / Services / S7 communication: Yes
MPI / Services / S7 communication, as client: No; but via CP and loadable FB
MPI / Services / S7 communication, as server: Yes
PROFIBUS DP master / Transmission rate, max.: 12 Mbit/s
PROFIBUS DP master / max. number of DP devices: 124
PROFIBUS DP master / Services / PG/OP communication: Yes
PROFIBUS DP master / Services / Routing: Yes
PROFIBUS DP master / Services / Global data communication: No
PROFIBUS DP master / Services / S7 basic communication: Yes; I blocks only
PROFIBUS DP master / Services / S7 communication: Yes
PROFIBUS DP master / Services / S7 communication, as client: No
PROFIBUS DP master / Services / S7 communication, as server: Yes
PROFIBUS DP master / Services / Equidistance: Yes
PROFIBUS DP master / Services / Isochronous mode: Yes; OB 61; isochronous mode can only be used alternatively on PROFIBUS DP or PROFINET IO
PROFIBUS DP master / Services / SYNC/FREEZE: Yes
PROFIBUS DP master / Services / activation/deactivation of DP devices: Yes
PROFIBUS DP master / Services / max. number of DP devices that can be activated/deactivated at the same time: 8
PROFIBUS DP master / Services / Direct data exchange (slave-to-slave communication): Yes; as subscriber
PROFIBUS DP master / Services / DPV1: Yes
PROFIBUS DP master / Address area / Inputs, max.: 2 kbyte
PROFIBUS DP master / Address area / Outputs, max.: 2 kbyte
PROFIBUS DP master / User data per DP device / Inputs, max.: 244 byte
PROFIBUS DP master / User data per DP device / Outputs, max.: 244 byte
PROFIBUS DP device / Transmission rate, max.: 12 Mbit/s
PROFIBUS DP device / automatic baud rate search: Yes; only with passive interface
PROFIBUS DP device / Address area, max.: 32
PROFIBUS DP device / User data per address area, max.: 32 byte
PROFIBUS DP device / Services / PG/OP communication: Yes
PROFIBUS DP device / Services / Routing: Yes; Only with active interface
PROFIBUS DP device / Services / Global data communication: No
PROFIBUS DP device / Services / S7 basic communication: No
PROFIBUS DP device / Services / S7 communication: Yes
PROFIBUS DP device / Services / S7 communication, as client: No
PROFIBUS DP device / Services / S7 communication, as server: Yes; Connection configured on one side only
PROFIBUS DP device / Services / Direct data exchange (slave-to-slave communication): Yes
PROFIBUS DP device / Services / DPV1: No
PROFIBUS DP device / Transfer memory / Inputs: 244 byte
PROFIBUS DP device / Transfer memory / Outputs: 244 byte
2. Interface / Interface type: PROFINET
2. Interface / Isolated: Yes
2. Interface / automatic detection of transmission rate: Yes; 10/100 Mbit/s
2. Interface / Autonegotiation: Yes
2. Interface / Autocrossing: Yes
2. Interface / Change of IP address at runtime, supported: Yes
Interface types / RJ 45 (Ethernet): Yes
Interface types / Number of ports: 2
Interface types / integrated switch: Yes
Protocols / MPI: No
Protocols / PROFINET IO Controller: Yes; Also simultaneously with IO-Device functionality
Protocols / PROFINET IO Device: Yes; Also simultaneously with IO Controller functionality
Protocols / PROFINET CBA: Yes
Protocols / PROFIBUS DP master: No
Protocols / PROFIBUS DP device: No
Protocols / Open IE communication: Yes; Via TCP/IP, ISO on TCP, and UDP
Protocols / Web server: Yes
Protocols / Media redundancy: Yes
PROFINET IO Controller / Transmission rate, max.: 100 Mbit/s
PROFINET IO Controller / Services / PG/OP communication: Yes
PROFINET IO Controller / Services / Routing: Yes
PROFINET IO Controller / Services / S7 communication: Yes; With loadable FBs, max. configurable connections: 14, max. number of instances: 32
PROFINET IO Controller / Services / Isochronous mode: Yes; OB 61; isochronous mode can only be used alternatively on PROFIBUS DP or PROFINET IO
PROFINET IO Controller / Services / IRT: Yes
PROFINET IO Controller / Services / Shared device: Yes
PROFINET IO Controller / Services / Prioritized startup: Yes
PROFINET IO Controller / Services / Number of IO devices with prioritized startup, max.: 32
PROFINET IO Controller / Services / Number of connectable IO Devices, max.: 128
PROFINET IO Controller / Services / Of which IO devices with IRT, max.: 64
PROFINET IO Controller / Services / of which in line, max.: 64
PROFINET IO Controller / Services / Number of IO Devices with IRT and the option "high flexibility": 128
PROFINET IO Controller / Services / of which in line, max.: 61
PROFINET IO Controller / Services / Number of connectable IO Devices for RT, max.: 128
PROFINET IO Controller / Services / of which in line, max.: 128
PROFINET IO Controller / Services / Activation/deactivation of IO Devices: Yes
PROFINET IO Controller / Services / Number of IO Devices that can be simultaneously activated/deactivated, max.: 8
PROFINET IO Controller / Services / IO Devices changing during operation (partner ports), supported: Yes
PROFINET IO Controller / Services / Number of IO Devices per tool, max.: 8
PROFINET IO Controller / Services / Device replacement without swap medium: Yes
PROFINET IO Controller / Services / Send cycles: 250 μs, 500 μs,1 ms; 2 ms, 4 ms (not in the case of IRT with "high flexibility" option)
PROFINET IO Controller / Services / Updating time: 250 µs to 512 ms (depending on the operating mode, see Manual "S7-300 CPU 31xC and CPU 31x, technical Data" for more details)
PROFINET IO Controller / Address area / Inputs, max.: 2 kbyte
PROFINET IO Controller / Address area / Outputs, max.: 2 kbyte
PROFINET IO Controller / Address area / User data consistency, max.: 1 024 byte
PROFINET IO Device / Services / PG/OP communication: Yes
PROFINET IO Device / Services / Routing: Yes
PROFINET IO Device / Services / S7 communication: Yes; With loadable FBs, max. configurable connections: 14, max. number of instances: 32
PROFINET IO Device / Services / Isochronous mode: No
PROFINET IO Device / Services / IRT: Yes
PROFINET IO Device / Services / PROFIenergy: Yes; With SFB 73 / 74 prepared for loadable PROFIenergy standard FB for I- Device
PROFINET IO Device / Services / Shared device: Yes
PROFINET IO Device / Services / Number of IO Controllers with shared device, max.: 2
PROFINET IO Device / Transfer memory / Inputs, max.: 1 440 byte; Per IO Controller with shared device
PROFINET IO Device / Transfer memory / Outputs, max.: 1 440 byte; Per IO Controller with shared device
PROFINET IO Device / Submodules / Number, max.: 64
PROFINET IO Device / Submodules / User data per submodule, max.: 1 024 byte
PROFINET CBA / acyclic transmission: Yes
PROFINET CBA / cyclic transmission: Yes
Open IE communication / Number of connections, max.: 8
Open IE communication / Local port numbers used at the system end: 0, 20, 21, 23, 25, 80, 102, 135, 161, 443, 8080, 34962, 34963, 34964, 65532, 65533, 65534, 65535
Open IE communication / Keep-alive function, supported: Yes
Protocols / PROFIsafe: No
Redundancy mode / Media redundancy / Switchover time on line break, typ.: 200 ms; PROFINET MRP
Redundancy mode / Media redundancy / Number of stations in the ring, max.: 50
Open IE communication / TCP/IP: Yes; via integrated PROFINET interface and loadable FBs
Open IE communication / Number of connections, max.: 8
Open IE communication / Data length for connection type 01H, max.: 1 460 byte
Open IE communication / Data length for connection type 11H, max.: 32 768 byte
Open IE communication / several passive connections per port, supported: Yes
Open IE communication / ISO-on-TCP (RFC1006): Yes; via integrated PROFINET interface and loadable FBs
Open IE communication / Number of connections, max.: 8
Open IE communication / Data length, max.: 32 768 byte
Open IE communication / UDP: Yes; via integrated PROFINET interface and loadable FBs
Open IE communication / Number of connections, max.: 8
Open IE communication / Data length, max.: 1 472 byte
Web server / supported: Yes
Web server / User-defined websites: Yes
Web server / Number of HTTP clients: 5
PG/OP communication: Yes
Communication functions / Data record routing: Yes
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 integrated PROFINET interface and loadable FB or via CP and loadable FB
S7 communication / User data per job, max.: See online help of STEP 7 (shared parameters of the SFBs/FBs and of the SFCs/FCs of S7 Communication)
S5 compatible communication / supported: Yes; via CP and loadable FC
PROFINET CBA (at set setpoint communication load) / Setpoint for the CPU communication load: 50 %
PROFINET CBA (at set setpoint communication load) / Number of remote interconnection partners: 32
PROFINET CBA (at set setpoint communication load) / number of master/device functions: 30
PROFINET CBA (at set setpoint communication load) / total of all master/device connections: 1 000
PROFINET CBA (at set setpoint communication load) / data length of all incoming master/device connections, max.: 4 000 byte
PROFINET CBA (at set setpoint communication load) / data length of all outgoing master/device connections, max.: 4 000 byte
PROFINET CBA (at set setpoint communication load) / Number of device-internal and PROFIBUS interconnections: 500
PROFINET CBA (at set setpoint communication load) / Data length of device-internal und PROFIBUS interconnections, max.: 4 000 byte
PROFINET CBA (at set setpoint communication load) / Data length per connection, max.: 1 400 byte
PROFINET CBA (at set setpoint communication load) / Remote interconnections with cyclic transmission / Transmission frequency: Transmission interval, min.: 10 ms
PROFINET CBA (at set setpoint communication load) / Remote interconnections with cyclic transmission / Number of incoming interconnections: 200
PROFINET CBA (at set setpoint communication load) / Remote interconnections with cyclic transmission / Number of outgoing interconnections: 200
PROFINET CBA (at set setpoint communication load) / Remote interconnections with cyclic transmission / Data length of all incoming interconnections, max.: 2 000 byte
PROFINET CBA (at set setpoint communication load) / Remote interconnections with cyclic transmission / Data length of all outgoing interconnections, max.: 2 000 byte
PROFINET CBA (at set setpoint communication load) / Remote interconnections with cyclic transmission / Data length per connection, max.: 450 byte
PROFINET CBA (at set setpoint communication load) / HMI variables via PROFINET (acyclic) / Number of stations that can log on for HMI variables (PN OPC/iMap): 3; 2x PN OPC/1x iMap
PROFINET CBA (at set setpoint communication load) / HMI variables via PROFINET (acyclic) / HMI variable updating: 500 ms
PROFINET CBA (at set setpoint communication load) / HMI variables via PROFINET (acyclic) / Number of HMI variables: 200
PROFINET CBA (at set setpoint communication load) / HMI variables via PROFINET (acyclic) / Data length of all HMI variables, max.: 2 000 byte
PROFINET CBA (at set setpoint communication load) / PROFIBUS proxy functionality / supported: Yes
PROFINET CBA (at set setpoint communication load) / PROFIBUS proxy functionality / Number of linked PROFIBUS devices: 16
PROFINET CBA (at set setpoint communication load) / PROFIBUS proxy functionality / Data length per connection, max.: 240 byte; Slave-dependent
Number of connections / overall: 16
Number of connections / usable for PG communication: 15
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.: 15
Number of connections / usable for OP communication: 15
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.: 15
Number of connections / usable for S7 basic communication: 14
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.: 14
Number of connections / usable for S7 communication: 14
Number of connections / reserved for S7 communication: 0
Number of connections / adjustable for S7 communication, min.: 0
Number of connections / adjustable for S7 communication, max.: 14
Number of connections / total number of instances, max.: 32
Number of connections / usable for routing: X1 as MPI: max. 10; X1 as DP master: max. 24; X1 as DP slave (active): max. 14; X2 as PROFINET: 24 max.
S7 message functions / Number of login stations for message functions, max.: 16; 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

Technical documents (1)

Siemens data sheet 6ES7315-2EH14-0AB0

Key features

384 KB integrated work memory; program on a Micro Memory Card up to 8 MB
1st interface MPI/PROFIBUS DP, 12 Mbit/s
2nd interface PROFINET with 2-port switch (RJ45)
24 V DC supply
Discontinued by Siemens on 1 October 2025; spare part only

About the Siemens 6ES7315-2EH14-0AB0

The Siemens 6ES7315-2EH14-0AB0 is the CPU 315-2 PN/DP. Siemens's data sheet gives it 384 KB of integrated work memory and a Micro Memory Card for the program (up to 8 MB), a combined MPI/PROFIBUS DP interface at up to 12 Mbit/s, and a PROFINET interface with a two-port switch on RJ45, on 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 6ES7315-2EH14-0AB0 used for?

It is the controller of an S7-300 station: it runs the STEP 7 program and drives the I/O modules on its rack and the remote I/O on its networks. A failed CPU stops the machine or line it controls. The PN/DP version adds PROFINET, for Ethernet-based I/O and communication alongside PROFIBUS.

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, 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.

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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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