Siemens Simatic S7-300 User manual

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Preface, Contents
CPUs 1
CPU 31x-2 as DP Master/DP
Slave and Direct Communication 2
Cycle and Reaction times 3
CPU Function, depending on
CPU and STEP 7 Version 4
Tips and Tricks 5
Appendix
Standards, Certificates and
Approvals A
Dimensioned Drawings B
List of Abbreviations C
Glossary, Index
Edition 10/2001
A5E00111190-01
PLC S7-300,
CPU Specifications CPU 312 IFM
to CPU 318-2 DP
Reference Manual
SIMATIC
This manual is part of the documentation
package with the order number
6ES7398-8FA10-8BA0
This documentation can no longer be ordered under
the given number!

Index-2 PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
!Danger
indicates that death, severe personal injury or substantial property damage will result if proper precautions
are not taken.
!Warning
indicates that death, severe personal injury or substantial property damage can result if proper
precautions are not taken.
!Caution
indicates that minor personal injury can result if proper precautions are not taken.
Caution
indicates that property damage can result if proper precautions are not taken.
Notice
draws your attention to particularly important information on the product, handling the product, or to a
particular part of the documentation.
Qualified Personnel
Only qualified personnel should be allowed to install and work on this equipment. Qualified persons are
defined as persons who are authorized to commission, to ground and to tag circuits, equipment, and
systems in accordance with established safety practices and standards.
Correct Usage
Note the following:
!Warning
This device and its components may only be used for the applications described in the catalog or the
technical description, and only in connection with devices or components from other manufacturers which
have been approved or recommended by Siemens.
This product can only function correctly and safely if it is transported, stored, set up, and installed
correctly, and operated and maintained as recommended.
Trademarks SIMATIC, SIMATIC HMIand SIMATIC NETare registered trademarks of SIEMENS AG.
Third parties using for their own purposes any other names in this document which refer to trademarks
might infringe upon the rights of the trademark owners.
Safety Guidelines
This manual contains notices intended to ensure personal safety, as well as to protect the products and
connected equipment against damage. These notices are highlighted by the symbols shown below and
graded according to severity by the following texts:
We have checked the contents of this manual for agreement
with the hardware and software described. Since deviations
cannot be precluded entirely, we cannot guarantee full
agreement. However, the data in this manual are reviewed
regularly and any necessary corrections included in
subsequent editions. Suggestions for improvement are
welcomed.
Disclaimof LiabilityCopyright W Siemens AG 2001 All rights reserved
The reproduction, transmission or use of this document or its
contents is not permitted without express written authority.
Offenderswill be liable for damages. All rights, including rights
created by patent grant or registration of a utility model or
design,are reserved.
Siemens AG
Bereich Automatisierungs- und Antriebstechnik
Geschaeftsgebiet Industrie-Automatisierungssysteme
Postfach 4848, D- 90327 Nuernberg SiemensAG 2001
Technical data subject to change.
Siemens Aktiengesellschaft A5E00111190

iii
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Preface
Purpose of the Manual
This manual gives you a brief overview of 312 IFM to 318-2 CPUS in an S7-300.
You can look up information on how to operate the system, its functions and
technical data of the CPUs.
Essential know-how
General knowledge of automation technology is required for comprehension of this
Manual. You should also be acquainted with basic STEP 7 software as described
in your Programming with STEP 7 V 5.1 Manual.

Preface
iv PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Scope of the Manual
The manual covers the following CPUs and Hardware/Software versions:
CPU Order No. As of Version
Firmware Hardware
CPU 312 IFM 6ES7 312-5AC02-0AB0
6ES7 312-5AC82-0AB0 1.1.0 01
CPU 313 6ES7 313-1AD03-0AB0 1.1.0 01
CPU 314 6ES7 314-1AE04-0AB0
6ES7 314-1AE84-0AB0 1.1.0 01
CPU 314 IFM 6ES7 314-5AE03-0AB0
6ES7 314-5AE83-0AB0 1.1.0 01
CPU 314 IFM 6ES7 314-5AE10-0AB0 1.1.0 01
CPU 315 6ES7 315-1AF03-0AB0 1.1.0 01
CPU 315-2 DP 6ES7 315-2AF03-0AB0
6ES7 315-2AF83-0AB0 1.1.0 01
CPU 316-2 DP 6ES7 316-2AG00-0AB0 1.1.0 01
CPU 318-2 6ES7 318-2AJ00-0AB0 V3.0.0 03
This manual describes all modules that are valid at the time the manual is
released. We reserve the right to release product information for new modules or
new module versions.
Alterations from Previous Version
The following changes were made in the Structuring, CPU Data Manual, Order no.
6ES7398-8AA03-8BA0, Edition 2:
Now, this manual only contains the CPU description. For information on the
S7-300 structure and installation refer to the Installation Manual.
CPU 318-2 DP as of Firmware Version V3.0.0 behaves as DP Master according
to PROFIBUS DPV1.
Agreement for CPU 314IFM
The CPU 314IFM is available in 2 versions:
with slot for Memory Card (6ES7314-5EA10-0AB0)
without slot for Memory Card (6ES7314-5EA0x-0AB0)
All details in this chapter apply to both versions of CPU 314IFM, unless explicit
reference is made to differences between them.

Preface
v
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Approbation, Standards and Approvals
The SIMATIC S7-300 series conforms to:
Requirements and criteria to IEC 61131, Part 2
CE labeling
– EC Guideline 73/23/EEC on Low Voltages
– EC Guideline 89/336/EEC on electromagnetic compatibility (EMC)
Canadian Standards Association: CSA C22.2 Number 142, tested (Process
Control Equipment)
Underwriters Laboratories, Inc.: UL 508 registered (Industrial Control
Equipment)
Underwriters Laboratories, Inc.: UL 508 (Industrial Control Equipment)
Factory Mutual Research: Approval Standard Class Number 3611
C-Tick Australia

Preface
vi PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Integration in the Information Technology Environment
This Manual forms part of the S7-300 documentation package:
Reference Manual “CPU Data”
CPU Data of CPU 312 IFM to 318-2 DP
CPU Data of CPU 312C to 314C-2 PtP/DP
“Technological Functions” Manual
Manual
Samples
Installation Manual
Manual
Reference Manual “Module Data”
Manual
Operations List
“CPU 312 IFM, 314 IFM, 313, 315,
315-2 DP, 316-2 DP, 318-2 DP”
“CPUs 312C to 314C-2 PtP/DP
Getting Started
“S7-300”
Description on how to operate, of the functions
and of technical data of the CPU
Description of specific technological
functions:
Positioning
Counting
Point-to-point connection
Rules
The CD contains examples of
technological functions
Description of how to create a project and how
to install, wire, network and commission an
S7-300
Description and technological details
of signal modules, power supply
modules and interface modules
List of the CPU’s system resources and
their execution times.
Listing of all runtime function blocks
(OBs/SFCs/SFBs) and their execution times
the various Getting Started manuals offer help
for commissioning your applications
“CPU 31xC:Positioning with Analog Output”
“CPU 31xC: Positioning with Digital Outputs”
“CPU 31xC: Counting”
“CPU 31xC: Point-to-point Communication
“CPU 31xC: Controlling”
“CPU 31xC:
You are reading this manual
Figure 1-1 S7-300, information technology environment

Preface
vii
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Complementary to this documentation package you require the following manuals:
Manual
“Integrated Functions CPU 312 IFM/314 IFM”
Manual
Order no.: 6ES7398-8CA00-8BA0
Reference Manual “System Software for
S7-300/400 System and Standard Functions”
Reference manual
Part of the STEP 7 documentation package,
order no. 6ES7810-4CA05-8BR0
Description of technological functions of the
CPUs 312 IFM/314 IFM.
Description of the SFCs, SFBs and OBs of the
CPUs. This description is also available in the
STEP 7 Online Help.
Figure 1-2 Additional Documentation
Further Support
Please contact your local Siemens representative if you have any queries about
the products described in this manual.
http://www.ad.siemens.de/partner
Training Center
Newcomers to SIMATIC S7 PLCs are welcome to take part in our respective
training courses. Please contact your local Training Center, or the central Training
Center in D-90327 Nuremberg, Germany:
Phone: [phone].
http://www.sitrain.com

Preface
viii PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Automation and Drives, Service & Support
World-wide available 24-hours:
Johnson City
Nuremberg
Singapore
SIMATIC Hotline
World-wide (Nuremberg)
Technical Support
(Free Contact)
Local time: Mo.-Fr. 7:00
AM to 17:00 PM
Phone: [phone]
Fax: [phone]
E-mail: techsupport@
ad.siemens.de
GMT: +1:00
World-wide (Nuremberg)
Technical Support
(charged, only with SIMATIC Card)
Local time: Mo.-Fr. 0:00 AM to
24:00 PM
Phone: [phone]
Fax: [phone]
GMT: +01:00
Europe / Africa (Nuremberg)
Authorization
Local time: Mo.-Fr. 7:00
AM to 17:00 PM
Phone: [phone]
Fax: [phone]
E-mail: authorization@
nbgm.siemens.de
GMT: +1:00
America (Johnson City)
Technical Support and
Authorization
Local time: Mo.-Fr. 8:00 AM to
19:00 PM
Phone: [phone]
Fax: [phone]
E-mail: simatic.hotline@
sea.siemens.com
GMT: -5:00
Asia / Australia (Singapore)
Technical Support and
Authorization
Local time: Mo.-Fr. 8:30 AM to
17:30 PM
Phone: [phone]
Fax: [phone]
E-mail: simatic.hotline@
sae.siemens.com.sg
GMT: +8:00
Languages generally spoken at the SIMATIC Hotlines are German and English. Additional languages spoken at the
Authorization Hotline are French, Italian and Spanish.

Preface
ix
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
SIMATIC Documentation on the Internet
Documentation is available free of charge on the Internet under:
http://www.ad.siemens.de/support
Please use the Knowledge Manager offered at these locations for quick location of
your required documentation. Our Internet Forum offers a “Documentation”
conferencing room for your questions and solution proposals.
http://www.ad.siemens.de/support
Service & Support on the Internet
As a supplement to our provided documentation we offer our complete know-how
base on the Internet.
http://www.ad.siemens.de/support
There you will find:
Up-to-date product information (News), FAQs (Frequently Asked Questions),
Downloads, Tips and Tricks.
Our Newsletter always offers you the most up-to-date information on your
products.
The Knowledge Manager finds the right documents for you.
Users and specialists across the globe share their experiences in our Forum.
Your local service partner for Automation & Drives is found in our Service
Partner Database.
Information relating to on–site Service, repairs, spare parts and lots more is
available to you under the topic “Service”.

Preface
xPLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01

xi
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Contents
1 CPUs
1.1 Control and Display Elements 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1.1 Status and Fault Displays 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1.2 Mode Selector Switch 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1.3 Backup battery/accumulator 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1.4 Memory card 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1.5 MPI and PROFIBUS-DP Interface 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1.6 Clock and Runtime Meter 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Communication Options of the CPU 1-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Test Functions and Diagnostics 1-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.1 Testing Functions 1-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.2 Diagnostics with LED Display 1-22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.3 Diagnostics with STEP 7 1-22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4 CPUs - Technical Specifications 1-24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.1 CPU 312 IFM 1-25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.2 CPU 313 1-37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.3 CPU 314 1-40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.4 CPU 314IFM 1-43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.5 CPU 315 1-60. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.6 CPU 315-2 DP 1-63. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.7 CPU 316-2 DP 1-66. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.8 CPU 318-2 1-69. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 CPU 31x-2 as DP Master/DP Slave and Direct Communication
2.1 Information on DPV1 Functionality 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 DP Address Areas of the CPUs 31x-2 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 CPU 31x-2 as DP Master 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Diagnostics of the CPU 31x-2 as DP Master 2-6. . . . . . . . . . . . . . . . . . . . . . . .
2.5 CPU 31x-2 as DP-Slave 2-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
xii PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
2.6 Diagnosis of the CPU 31x-2 operating as DP-Slave 2-18. . . . . . . . . . . . . . . . . .
2.6.1 Diagnosis with LEDs 2-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6.2 Diagnostics with STEP 5 or STEP 7 2-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6.3 Reading Out the Diagnostic Data 2-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6.4 Format of the Slave Diagnostic Data 2-24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6.5 Station Status 1 to 3 2-25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6.6 Master PROFIBUS Address 2-27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6.7 Manufacturer ID 2-27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6.8 Module Diagnostics 2-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6.9 Station Diagnostics 2-29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6.10 Interrupts 2-31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7 Direct Data Exchange 2-32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.8 Diagnosis with Direct Communication 2-33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Cycle and Reaction times
3.1 Cycle time 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Response Time 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Calculation Examples for Cycle Time and Response Time 3-10. . . . . . . . . . . .
3.4 Interrupt response time 3-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5 Calculation Example for the Interrupt Response Time 3-16. . . . . . . . . . . . . . . .
3.6 Reproducibility of Delay and Watchdog Interrupts 3-16. . . . . . . . . . . . . . . . . . . .
4 CPU Function, depending on CPU and STEP 7 Version
4.1 Differences between CPU 3182 and CPUs 312 IFM to 3162 DP 4-2. . . . . . .
4.2 The Differences Between the CPUs 312 IFM to 318 and
Their Previous Versions 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Tips and Tricks
A Standards, Certificates and Approvals
B Dimensioned Drawings
C List of Abbreviations
Glossary
Index

Contents
xiii
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Figures
1-1 Control and Display Elements of the CPUs 1-2. . . . . . . . . . . . . . . . . . . . . . . . .
1-2 Status and Fault Displays of the CPUs 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3 Principle of Connection Resource Allocation for CPU 318-2 1-15. . . . . . . . . . .
1-4 The Principle of Forcing with S7-300 CPUs (CPU 312IFM to 316-2DP) 1-21.
1-5 Display of the States of the Interrupt Inputs of the CPU 312 IFM 1-26. . . . . . .
1-6 Front View of the CPU 312 IFM 1-27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-7 Wiring diagram of the CPU 312 IFM 1-34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-8 Basic Circuit Diagram of the CPU 312 IFM 1-36. . . . . . . . . . . . . . . . . . . . . . . . . .
1-9 Display of the States of the Interrupt Inputs of the CPU 314 IFM 1-45. . . . . . .
1-10 Front View of the CPU 314 IFM 1-46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-11 Wiring diagram of the CPU 314 IFM 1-56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-12 Basic Circuit Diagram of the CPU 314 IFM (Special Inputs
and Analog Inputs/Outputs) 1-57. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-13 Basic Circuit Diagram of the CPU 314 IFM (Digital Inputs/Outputs) 1-58. . . . .
1-14 Connecting 2-wire measurement transducers to the analog inputs
of CPU 314 IFM 1-59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-15 Wiring of 4-wire measurement transducers to the analog inputs
of CPU 314 IFM 1-59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1 Diagnostics with CPU 315-2DP < 315-2AF03 2-8. . . . . . . . . . . . . . . . . . . . . . .
2-2 Diagnostics with CPU 31x-2 (315-2DP as of 315-2AF03) 2-9. . . . . . . . . . . . .
2-3 Diagnostic Addresses for DP Master and DP Slave 2-10. . . . . . . . . . . . . . . . . .
2-4 Transfer Memory in a CPU 31x-2 operating as DP Slave 2-14. . . . . . . . . . . . .
2-5 Diagnostic Addresses for DP Master and DP Slave 2-22. . . . . . . . . . . . . . . . . .
2-6 Format of the Slave Diagnostic Data 2-24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-7 Structure of the Module Diagnosis of the CPU 31x-2 2-28. . . . . . . . . . . . . . . . .
2-8 Structure of the Station Diagnosis 2-29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-9 Byte x +4 to x +7 for Diagnostic and Hardware interrupt 2-30. . . . . . . . . . . . . .
2-10 Direct Communication using CPU 31x-2 2-32. . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-11 Diagnostic address for receiver with direct communication 2-33. . . . . . . . . . . .
3-1 Component Parts of the Cycle Time 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 Shortest Response Time 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3 Longest Response Time 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-4 Overview of the Bus Runtime on PROFIBUS-DP at 1.5 Mbps
and 12Mbps 3-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1 Sample Configuration 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-1 Dimensioned Drawing of the CPU 312 IFM B-1. . . . . . . . . . . . . . . . . . . . . . . . .
B-2 Dimensioned Drawing of the CPU 313/314/315/315-2 DP/316-2DP B-2. . . .
B-3 Dimensioned Drawing of the CPU 318-2 B-3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-4 Dimensioned Drawing of the CPU 314 IFM, Front View B-4. . . . . . . . . . . . . . .
B-5 Dimensioned Drawing of the CPU 314 IFM, Side View B-5. . . . . . . . . . . . . . .

Contents
xiv PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Tables
1-1 The Differences in Control and Display Elements Between CPUs 1-2. . . . . .
1-2 Using a Backup Battery or Accumulator 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3 Memory Cards 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4 CPU Interfaces 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-5 Characteristics of the Clock of the CPUs 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . .
1-6 CPU Communication Options 1-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-7 Connection Resources for CPUs 312 IFM to 316-2 DP 1-14. . . . . . . . . . . . . . .
1-8 Communication Resources for CPU 318-2 1-15. . . . . . . . . . . . . . . . . . . . . . . . .
1-9 Diagnostic LEDs of the CPU 1-22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-10 Start Information for OB 40 for the Interrupt Inputs
of the Integrated I/Os 1-26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-11 Start Information for OB 40 for the Interrupt Inputs
of the Integrated I/Os 1-44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-12 Characteristic Features of the Integrated Inputs and Outputs
of the CPU 314 IFM 1-50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1 Meaning of the BUSF LED of the CPU 31x-2 as DP Master 2-6. . . . . . . . . . .
2-2 Reading Diagnostic Data with STEP 7 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3 Event Detection of the CPU 31x-2 as DP Master 2-11. . . . . . . . . . . . . . . . . . . .
2-4 Evaluating RUN-STOP Transitions of the DP Slaves in the DP Master 2-12. .
2-5 Example of an address area configuration for transfer memory 2-15. . . . . . . .
2-6 Meaning of the BUSF LEDs in the CPU 31x-2 as DP Slave 2-19. . . . . . . . . . .
2-7 Fetching diagnostic data with STEP 5 and STEP 7
in the master system 2-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-8 Event Detection of the CPU 31x-2 as DP Slave 2-23. . . . . . . . . . . . . . . . . . . . .
2-9 Evaluating RUN-STOP Transitions in the DP Master/DP Slave 2-23. . . . . . . .
2-10 Structure of Station Status 1 (Byte 0) 2-25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-11 Structure of Station Status 2 (Byte 1) 2-26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-12 Structure of Station Status 3 (Byte 2) 2-26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-13 Structure of the Master PROFIBUS Address (Byte 3) 2-27. . . . . . . . . . . . . . . .
2-14 Structure of the Manufacturer Identification (Bytes 4 and 5) 2-27. . . . . . . . . . .
2-15 Event Detection by CPU 31x-2 Acting as Receiver in
Direct Communication 2-33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-16 Evaluation of the Station Failure of the Sender During
Direct Communication 2-34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1 Operating System Processing Times of the CPUs 3-6. . . . . . . . . . . . . . . . . . .
3-2 Process image update of the CPUs 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3 CPU-specific Factors for the User Program Processing Time 3-7. . . . . . . . . .
3-4 Updating the S7 Timers 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-5 Update Time and SFB Runtimes 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-6 Extending the Cycle by Nesting Interrupts 3-10. . . . . . . . . . . . . . . . . . . . . . . . .
3-7 Response time of the CPUs to process interrupts 3-14. . . . . . . . . . . . . . . . . . .
3-8 Diagnostic Interrupt Response Times of the CPUs 3-15. . . . . . . . . . . . . . . . . .
3-9 Reproducibility of the Delay and Watchdog Interrupts of the CPUs 3-17. . . . .

1-1
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
CPUs
In This Section
Section Contents Page
1.1 Control and Display Elements 1-2
1.2 CPU Communication Options 1-11
1.3 Test Functions and Diagnostics 1-19
1.4 CPUs - Technical Specifications 1-24
Agreement for CPU 314IFM
The CPU 314IFM is available in 2 versions:
with slot for memory card (6ES7314-5EA10-0AB0)
without slot for memory card (6ES7314-5EA0x-0AB0/
6314ES7314-5EA8x-0AB0)
All details in this chapter apply to both versions of the CPU314IFM unless explicit
reference is made to differences between them.
1

CPUs
1-2 PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
1.1 Control and Display Elements
Figure 1-1 shows you the control and display elements of a CPU.
The order of the elements in some CPUs might differ from the order shown in the
figure below. The individual CPUs do not always have all the elements shown here.
Table 1-1 shows you the differences.
Slot for memory
card
Compartment for backup
battery or rechargeable
battery
M
L
+M PROFIBUS-DP
interface
Status and
fault LEDs
Mode selector
Connection for power supply
and system ground
Multipoint Interface
(MPI)
Status and
fault displays for
DP interface
Figure 1-1 Control and Display Elements of the CPUs
Differences Between CPUs
Table 1-1 The Differences in Control and Display Elements Between CPUs
Element 312 IFM 313 314 314 IFM 315 315-2 316-2 318-2
-5AE0x
--5AE10 -DP DP
LEDs for DP
interface No Yes
Backup
battery/accumulator No No accumu-
lator
Yes
Connection for
power supply No; via the front
connector
Yes
Memory card No Yes No Yes Yes
PROFIBUS-DP
interface No Yes

CPUs
1-3
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
1.1.1 Status and Fault Displays
SF ... (red) ...hardware/software error
BATF ... (red) ...battery error (not CPU 312 IFM)
DC5V ... (green) ... 5V DC supply for CPU and S7-300 bus is ok.
FRCE ... (yellow) ...force job is active
RUN ... (green) ... CPU in RUN mode; LED flashes at start-up with 1 Hz; in HALT mode with 0.5 Hz
STOP ... (yellow) ... CPU in STOP/HALT or STARTUP mode;
LED flashes on request to reset memory
BUSF ... (red) ... hardware or software fault at PROFIBUS interface
CPU 315-2 DP/
CPU 316-2 DP
Displays for the CPU:
Displays for the PROFIBUS:
BUS2F ... (red) ... hardware or software fault at interface 2
BUS1F ... (red) ... hardware or software fault at interface 1
CPU 318-2
Figure 1-2 Status and Fault Displays of the CPUs

CPUs
1-4 PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
1.1.2 Mode Selector Switch
The mode selector is the same in all CPUs.
Mode Selector Positions
The positions of the mode selector are explained in the order in which they appear
on the CPU.
Details on CPU operating modes are found in the STEP 7 Online Help .
Position Description Description
RUN-P RUN-PROGRAM
mode The CPU scans the user program.
The key cannot be taken out in this position.
RUN mode RUN mode The CPU scans the user program.
The user program cannot be changed without password
confirmation.
The key can be removed in this position to prevent anyone not
authorized to do so from changing the operating mode.
Stop mode Stop mode The CPU does not scan user programs.
The key can be removed in this position to prevent anyone not
authorized to do so from changing the operating mode.
MRES mode Memory reset Momentary-contact position of the mode selector for CPU memory
reset (or a cold start as well in the case of the 318-2).
Memory reset per mode selector switch requires a specific
sequence of operation.