SIEMENS S7-300 Standard CPUs CPU 315-2 DP Overview/Application

Overview

  • The CPU with medium to large program memory and quantity structures for optional use of SIMATIC engineering tools
  • High processing power in binary and floating-point arithmetic
  • Used as central controller in production lines with central and distributed I/O
  • PROFIBUS DP master/slave interface
  • For comprehensive I/O expansion
  • For configuring distributed I/O structures
  • Isochronous mode on PROFIBUS

SIMATIC Micro Memory Card required for operation of CPU.S7-300 CPU 315-2 DP

Application

The CPU 315-2 DP is a CPU with medium to large program memory and PROFIBUS DP master/slave interface. It is used in installations which have distributed automation structures in addition to a centralized I/O.

It is often used as the standard PROFIBUS DP master in SIMATIC S7-300. The CPU is also used as distributed intelligence (DP slave).

It has been optimized in terms of its quantitative framework for using SIMATIC Engineering Tools, e.g.,:

  • Programming with SCL
  • Sequence control programming with S7-GRAPH

In addition, the CPU offers an ideal platform for simple technology tasks implemented in software, e.g.,:

  • Easy Motion Control
  • The solution of closed-loop control tasks with STEP 7 blocks or the runtime software Standard/Modular PID Control

Extended process diagnostics can be achieved by using SIMATIC S7-PDIAG.

Product No. / Product Description Listprice / Your price
6ES7315-2AH14-0AB0
SIMATIC S7-300, CPU 315-2DP CPU WITH MPI INTERFACE INTEGRATED 24 V DC POWER SUPPLY 256 KBYTE WORKING MEMORY 2. INTERFACE DP-MASTER/SLAVE MICRO MEMORY CARD NECESSARY

Design

The CPU 315-2 DP is equipped with the following:

  • Microprocessor;
    the processor achieves a processing time of approximately 50 ns per binary instruction and 0.45 µs per floating-point operation.
  • 256 KB work memory (corresponds to approx. 85 K instructions);
    the extensive work memory for program sections relevant to execution offers sufficient space for user programs. SIMATIC Micro Memory Cards (8 MB max.) as load memory for the program also allow the project to be stored in the CPU (complete with symbols and comments) and can be used for data archiving and recipe management.
  • Flexible expansion capability;
    max. 32 modules (4-tier configuration)
  • MPI multi-point interface;
    the integrated MPI interface can establish as many as 16 connections simultaneously to S7-300/400 or connections to programming devices, PCs, OPs. Of these connections, one is always reserved for programming devices and another for OPs. The MPI makes it possible to set up a simple network with a maximum of 16 CPUs via “global data communication”.
  • PROFIBUS DP interface:
    The CPU 315-2 DP with PROFIBUS DP master/slave interface allows a distributed automation configuration offering high speed and ease of use. From the user’s point of view, the distributed I/Os are treated the same as central I/Os (identical configuration, addressing and programming).
    The PROFIBUS DP V1 standard is supported in full. This enhances the diagnostics and parameterization capability of DP V1 standard slaves.
S7-300 CPU 315-2 DP

Function

  • Password protection;
    a password concept protects the user program from unauthorized access.
  • Block encryption;
    the functions (FCs) and function blocks (FBs) can be stored in the CPU in encrypted form by means of S7-Block Privacy to protect the know-how of the application.
  • Diagnostics buffer;
    the last 500 error and interrupt events are stored in a buffer for diagnostic purposes, of which 100 are stored retentively.
  • Maintenance-free data backup;
    the CPU automatically saves all data (up to 128 KB) in case of a power failure so that the data are available again unchanged when the power returns.

Parameterizable properties

The S7 configuration as well as the properties and response of the CPUs can be parameterized using STEP 7:

  • General;
    definition of the name, plant identifier and location ID. Parameter assignment of the multi-point interface MPI: Determining node addresses.
  • Startup;
    definition of the startup characteristics of the CPU and the monitoring time
  • Synchronous cycle interrupts;
    setting of DP master system, process image partition number, and delay time
  • Cycle/clock memory;
    specification of the maximum cycle time and load. Setting of the clock memory address.
  • Retentivity;
    setting retentive areas
  • Clock interrupts;
    setting of start date, start time and periodicity
  • Watchdog interrupts;
    setting of periodicity
  • System diagnostics;
    determining handling and scope of the diagnostic alarms
  • Clock;
    setting the type of synchronization in the AS or on the MPI
  • Protection level;
    specifying the access rights to program and data
  • Communication;
    reservation of connection resources
  • PROFIBUS DP master/slave interface;
    User-oriented address allocation for distributed I/O. Parameterizing the operating mode and configuring the transfer areas in the case of PROFIBUS DP. Parameterizing the time synchronization

Display and information functions

  • Status and error indications;
    LEDs indicate hardware, programming, time, I/O, battery and bus errors, and operating statuses such as RUN, STOP and start-up.
  • Test functions;
    the PG is used to indicate signal states during program execution, to modify process variables independently of the user program and to output the contents of stack memories.
  • Information functions;
    the PG can be used to obtain information about the memory capacity and operating mode of the CPU, the current loading of the work and load memory, current cycle times and diagnostics buffer content in plain text.

Integrated communication functions

  • PG/OP communication
  • Global data communication
  • S7 basic communication
  • S7 communication (server only)
  • Routing
  • Data record routing

System functions

The CPU provides many extensive system functions for diagnostics, parameterization, synchronization, alerting, time measurement, etc.

For detailed information, refer to the manual.

Technical specifications

Article number

6ES7315-2AH14-0AB0

CPU315-2DP, 256 KB

General information

Hardware product version

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 DC

Yes

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 time

5 ms

  • ● Repeat rate, min.

1 s

Input current

Current consumption (rated value)

850 mA

Current consumption (in no-load operation), typ.

150 mA

Inrush current, typ.

3.5 A

I²t

1 A²·s

Power loss

Power loss, typ.

4.5 W

Memory

Work memory

  • ● integrated

256 kbyte

  • ● expandable

No

  • ● Size of retentive memory for retentive data blocks

128 kbyte

Load memory

  • ● Plug-in (MMC)

Yes

  • ● Plug-in (MMC), max.

8 Mbyte

  • ● Data management on MMC (after last programming), min.

10 y

Backup

  • ● present

Yes; Guaranteed by MMC (maintenance-free)

  • ● without battery

Yes; Program and data

CPU processing times

for bit operations, typ.

0.05 µs

for word operations, typ.

0.09 µs

for fixed point arithmetic, typ.

0.12 µs

for floating point arithmetic, typ.

0.45 µs

CPU-blocks

Number of blocks (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

  • ● Size, max.

64 kbyte

FB

  • ● Number, max.

1 024; Number range: 0 to 7999

  • ● Size, max.

64 kbyte

FC

  • ● Number, max.

1 024; Number range: 0 to 7999

  • ● Size, max.

64 kbyte

OB

  • ● Description

see instruction list

  • ● Size, max.

64 kbyte

  • ● Number of free cycle OBs

1; OB 1

  • ● Number of time alarm OBs

1; OB 10

  • ● Number of delay alarm OBs

2; OB 20, 21

  • ● Number of cyclic interrupt OBs

4; OB 32, 33, 34, 35

  • ● Number of process alarm OBs

1; OB 40

  • ● Number of DPV1 alarm OBs

3; OB 55, 56, 57

  • ● Number of isochronous mode OBs

1; OB 61

  • ● Number of startup OBs

1; OB 100

  • ● Number of asynchronous error OBs

5; OB 80, 82, 85, 86, 87

  • ● Number of synchronous error OBs

2; OB 121, 122

Nesting depth

  • ● per priority class

16

  • ● additional within an error OB

4

Counters, timers and their retentivity

S7 counter

  • ● Number

256

Retentivity

  • — adjustable

Yes

  • — lower limit

0

  • — upper limit

255

  • — preset

Z 0 to Z 7

Counting range

  • — lower limit

0

  • — upper limit

999

IEC counter

  • ● Number

Unlimited (limited only by RAM capacity)

S7 times

  • ● Number

256

Retentivity

  • — adjustable

Yes

  • — lower limit

0

  • — upper limit

255

  • — preset

No retentivity

Time range

  • — lower limit

10 ms

  • — upper limit

9 990 s

IEC timer

  • ● present

Yes

  • ● Type

SFB

  • ● Number

Unlimited (limited only by RAM capacity)

Data areas and their retentivity

retentive data area in total

All, 128 KB max.

Flag

  • ● Number, max.

2 048 byte

  • ● Retentivity available

Yes; MB 0 to MB 2047

  • ● Retentivity preset

MB 0 to MB 15

  • ● Number of clock memories

8; 1 memory byte

Data blocks

  • ● Number, max.

1 024; Number range: 1 to 16000

  • ● Size, max.

64 kbyte

  • ● Retentivity adjustable

Yes; via non-retain property on DB

  • ● Retentivity preset

Yes

Local data

  • ● per priority class, max.

32 kbyte; Max. 2 KB per block

Address area

I/O address area

  • ● Inputs

2 048 byte

  • ● Outputs

2 048 byte

of which distributed

  • — Inputs

2 048 byte

  • — Outputs

2 048 byte

Process image

  • ● Inputs

2 048 byte

  • ● Outputs

2 048 byte

  • ● Inputs, adjustable

2 048 byte

  • ● Outputs, adjustable

2 048 byte

  • ● Inputs, default

128 byte

  • ● Outputs, default

128 byte

Subprocess images

  • ● Number of subprocess images, max.

1

Digital channels

  • ● Inputs

16 384

  • — of which central

1 024

  • ● Outputs

16 384

  • — of which central

1 024

Analog channels

  • ● Inputs

1 024

  • — of which central

256

  • ● Outputs

1 024

  • — of which central

256

Hardware configuration

Number of expansion units, max.

3

Number of DP masters

  • ● integrated

1

  • ● via CP

4

Number of operable FMs and CPs (recommended)

  • ● FM

8

  • ● CP, PtP

8

  • ● CP, LAN

10

Rack

  • ● Racks, max.

4

  • ● Modules per rack, max.

8

Time of day

Clock

  • ● Hardware clock (real-time)

Yes

  • ● retentive and synchronizable

Yes

  • ● Backup time

6 wk; At 40 °C ambient temperature

  • ● Deviation per day, max.

10 s; Typ.: 2 s

  • ● Behavior of the clock following POWER-ON

Clock continues running after POWER OFF

  • ● Behavior of the clock following expiry of backup period

Clock continues to run with the time at which the power failure occurred

Operating hours counter

  • ● Number

1

  • ● Number/Number range

0

  • ● Range of values

0 to 2^31 hours (when using SFC 101)

  • ● Granularity

1 hour

  • ● retentive

Yes; Must be restarted at each restart

Clock synchronization

  • ● supported

Yes

  • ● to MPI, master

Yes

  • ● to MPI, slave

Yes

  • ● to DP, master

Yes; With DP slave only slave clock

  • ● to DP, slave

Yes

  • ● in AS, master

Yes

  • ● in AS, slave

No

Digital inputs

Number of digital inputs

0

Digital outputs

Number of digital outputs

0

Analog inputs

Number of analog inputs

0

Analog outputs

Number of analog outputs

0

Interfaces

Number of industrial Ethernet interfaces

0

Number of RS 485 interfaces

2; MPI and PROFIBUS DP

Number of RS 422 interfaces

0

1. Interface

Interface type

Integrated RS 485 interface

Physics

RS 485

Isolated

No

Power supply to interface (15 to 30 V DC), max.

200 mA

Functionality

  • ● MPI

Yes

  • ● PROFIBUS DP master

No

  • ● PROFIBUS DP slave

No

  • ● Point-to-point connection

No

MPI

  • ● Transmission rate, max.

187.5 kbit/s

Services

  • — PG/OP communication

Yes

  • — Routing

Yes

  • — Global data communication

Yes

  • — S7 basic communication

Yes

  • — S7 communication

Yes; Only server, configured on one side

  • — S7 communication, as client

No

  • — S7 communication, as server

Yes

2. Interface

Interface type

Integrated RS 485 interface

Physics

RS 485

Isolated

Yes

Power supply to interface (15 to 30 V DC), max.

200 mA

Functionality

  • ● MPI

No

  • ● PROFIBUS DP master

Yes

  • ● PROFIBUS DP slave

Yes

  • ● Point-to-point connection

No

DP master

  • ● Transmission rate, max.

12 Mbit/s

  • ● Number of DP slaves, max.

124; Per station

Services

  • — PG/OP communication

Yes

  • — Routing

Yes

  • — Global data communication

No

  • — S7 basic communication

Yes; I blocks only

  • — S7 communication

Yes; Only server, configured on one side

  • — S7 communication, as client

No

  • — S7 communication, as server

Yes

  • — Equidistance

Yes

  • — Isochronous mode

Yes; OB 61

  • — SYNC/FREEZE

Yes

  • — Activation/deactivation of DP slaves

Yes

  • — Number of DP slaves that can be simultaneously activated/deactivated, max.

8

  • — DPV1

Yes

Address area

  • — Inputs, max.

2 048 byte

  • — Outputs, max.

2 048 byte

User data per DP slave

  • — Inputs, max.

244 byte

  • — Outputs, max.

244 byte

DP slave

  • ● GSD file

The latest GSD file is available at: http://www.siemens.com/profibus-gsd

  • ● Transmission rate, max.

12 Mbit/s

  • ● automatic baud rate search

Yes; only with passive interface

  • ● Address area, max.

32

  • ● User data per address area, max.

32 byte

Services

  • — PG/OP communication

Yes

  • — Routing

Yes; Only with active interface

  • — Global data communication

No

  • — S7 basic communication

No

  • — S7 communication

Yes; Only server, configured on one side

  • — S7 communication, as client

No

  • — S7 communication, as server

Yes

  • — Direct data exchange (slave-to-slave communication)

Yes

  • — DPV1

No

Transfer memory

  • — Inputs

244 byte

  • — Outputs

244 byte

Isochronous mode

Isochronous operation (application synchronized up to terminal)

Yes

Communication functions

PG/OP communication

Yes

Data record routing

Yes

Global data communication

  • ● supported

Yes

  • ● 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

  • ● supported

Yes

  • ● 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

  • ● supported

Yes

  • ● as server

Yes

  • ● as client

Yes; 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

  • ● supported

Yes; via CP and loadable FC

Number of connections

  • ● overall

16

  • ● usable for PG communication

15

  • — reserved for PG communication

1

  • — adjustable for PG communication, min.

1

  • — adjustable for PG communication, max.

15

  • ● usable for OP communication

15

  • — reserved for OP communication

1

  • — adjustable for OP communication, min.

1

  • — adjustable for OP communication, max.

15

  • ● usable for S7 basic communication

12

  • — reserved for S7 basic communication

0

  • — adjustable for S7 basic communication, min.

0

  • — adjustable for S7 basic communication, max.

12

S7 message functions

Number of login stations for message functions, max.

16; Depending on the configured connections for PG/OP and S7 basic communication

Process diagnostic messages

Yes

simultaneously active Alarm-S blocks, max.

300

Test commissioning functions

Status block

Yes; Up to 2 simultaneously

Single step

Yes

Number of breakpoints

4

Status/control

  • ● Status/control variable

Yes

  • ● Variables

Inputs, outputs, memory bits, DB, times, counters

  • ● Number of variables, max.

30

  • — of which status variables, max.

30

  • — of which control variables, max.

14

Forcing

  • ● Forcing

Yes

  • ● Forcing, variables

Inputs, outputs

  • ● Number of variables, max.

10

Diagnostic buffer

  • ● present

Yes

  • ● Number of entries, max.

500

  • — adjustable

No

  • — of which powerfail-proof

100; Only the last 100 entries are retained

  • ● Number of entries readable in RUN, max.

  • — can be set

Yes; From 10 to 499

  • — preset

10

Service data

  • ● can be read out

Yes

Ambient conditions

Ambient temperature during operation

  • ● min.

0 °C

  • ● max.

60 °C

Configuration

Configuration software

  • ● STEP 7

Yes; V5.2 SP1 or higher with HW update

Programming

  • ● Command set

see instruction list

  • ● Nesting levels

8

  • ● System functions (SFC)

see instruction list

  • ● System function blocks (SFB)

see instruction list

Programming language

  • — LAD

Yes

  • — FBD

Yes

  • — STL

Yes

  • — SCL

Yes

  • — CFC

Yes

  • — GRAPH

Yes

  • — HiGraph®

Yes

Know-how protection

  • ● User program protection/password protection

Yes

  • ● Block encryption

Yes; With S7 block Privacy

Dimensions

Width

40 mm

Height

125 mm

Depth

130 mm

Weights

Weight, approx.

290 g