Siemens Simatic S7-400 User manual

SIMATIC S7-400 SIMATIC S7-400 S7-400 Automation System, CPU Specifications
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Introduction 1
Structure of a CPU 41x 2
Special functions of a
CPU 41x 3
Communication 4
PROFIBUS DP 5
PROFINET 6
Consistent Data 7
Storage Concept and
Startup Types 8
Cycle and Response Times
of the S7-400 9
Technical specifications 10
IF 964-DP interface module 11
SIMATIC
S7-400
S7-400 Automation System,
CPU Specifications
Manual
10/2006
6ES7498-8AA04-8BA0
This manual is part of the documentation package
with the order number 6ES74898-8AA05-8BA0

Safety Guidelines
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
!
Danger
indicates that death or severe personal injury will result if proper precautions are not taken.
!
Warning
indicates that death or severe personal injury may result if proper precautions are not taken.
!
Caution
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Caution
without a safety alert symbol, indicates that property damage can result if proper precautions are not taken.
Notice
indicates that an unintended result or situation can occur if the corresponding information is not taken into
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If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The device/system may only be set up and used in conjunction with this documentation. Commissioning and
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in this documentation qualified persons are defined as persons who are authorized to commission, ground and
label devices, systems and circuits in accordance with established safety practices and standards.
Prescribed Usage
Note the following:
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Warning
This device may only be used for the applications described in the catalog or the technical description and only in
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Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
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Siemens AG
Automation and Drives
Postfach 48 48
90437 NÜRNBERG
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Order No.: 6ES7498-8AA04-8BA0
Edition 10/2006
Copyright © Siemens AG 2006.
Technical data subject to change

S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0 iii
Table of contents
1 Introduction............................................................................................................................................. 1-1
2 Structure of a CPU 41x........................................................................................................................... 2-1
2.1 Control and display elements of the CPUs................................................................................ 2-1
2.2 Monitoring functions of the CPU ................................................................................................ 2-5
2.3 Status and error displays ........................................................................................................... 2-8
2.4 Mode selector switch ............................................................................................................... 2-11
2.5 Running a memory reset.......................................................................................................... 2-13
2.6 Cold start / Warm restart / Hot restart...................................................................................... 2-15
2.7 Structure and Functions of the Memory Cards........................................................................ 2-17
2.8 Use of the Memory Cards ........................................................................................................ 2-20
2.9 Multipoint Interface (MPI)......................................................................................................... 2-22
2.10 PROFIBUS DP Interface.......................................................................................................... 2-24
2.11 PROFINET (PN) interface........................................................................................................ 2-25
2.12 Overview of the parameters for the S7-400 CPUs .................................................................. 2-26
3 Special functions of a CPU 41x .............................................................................................................. 3-1
3.1 Web Server ................................................................................................................................ 3-1
3.2 Multicomputing........................................................................................................................... 3-3
3.2.1 Fundamentals ............................................................................................................................ 3-3
3.2.2 Special Features at Multicomputing........................................................................................... 3-5
3.2.3 Multicomputing interrupt............................................................................................................. 3-6
3.2.4 Configuring and programming multicomputing mode................................................................ 3-6
3.3 System modifications during operation......................................................................................3-7
3.3.1 Basics......................................................................................................................................... 3-7
3.3.2 Hardware requirements ............................................................................................................. 3-8
3.3.3 Software requirements............................................................................................................. 3-10
3.3.4 Permitted system modifications ............................................................................................... 3-11
3.4 Resetting the CPU to the factory state .................................................................................... 3-12
3.5 Updating firmware online ......................................................................................................... 3-14
3.6 Reading out service data ......................................................................................................... 3-15

Table of contents
S7-400 Automation System, CPU Specifications
iv Manual, 10/2006, 6ES7498-8AA04-8BA0
4 Communication....................................................................................................................................... 4-1
4.1 interfaces.................................................................................................................................... 4-1
4.1.1 Multi-Point Interface (MPI) ......................................................................................................... 4-1
4.1.2 PROFIBUS DP........................................................................................................................... 4-2
4.1.3 PROFINET ................................................................................................................................. 4-4
4.2 Communication services ............................................................................................................ 4-6
4.2.1 Overview of communication services......................................................................................... 4-6
4.2.2 PG communication..................................................................................................................... 4-7
4.2.3 OP communication..................................................................................................................... 4-7
4.2.4 S7 basic communication ............................................................................................................ 4-8
4.2.5 S7 communication...................................................................................................................... 4-9
4.2.6 Global data communication...................................................................................................... 4-11
4.2.7 Routing..................................................................................................................................... 4-13
4.3 S7 connections......................................................................................................................... 4-18
4.3.1 Communication path of an S7 connection ............................................................................... 4-18
4.3.2 Assignment of S7 connections................................................................................................. 4-19
4.3.3 Distribution and availability of S7 connection resources.......................................................... 4-21
5 PROFIBUS DP ....................................................................................................................................... 5-1
5.1 CPU 41x-3 PN/DP as DP master / DP slave ............................................................................. 5-1
5.1.1 Overview .................................................................................................................................... 5-1
5.1.2 DP address areas of 41x CPUs ................................................................................................. 5-2
5.1.3 CPU 41x as PROFIBUS DP master .......................................................................................... 5-3
5.1.4 Diagnostics of the CPU 41x as DP master ................................................................................ 5-6
5.1.5 CPU 41x as DP slave............................................................................................................... 5-11
5.1.6 Diagnostics of the CPU 41x as DP slave................................................................................. 5-16
5.1.7 CPU 41x as DP slave: Station statuses 1 to 3......................................................................... 5-21
5.1.8 Direct Data Exchange .............................................................................................................. 5-28
5.1.8.1 Principle of direct data exchange............................................................................................. 5-28
5.1.8.2 Diagnostics in direct data exchange ........................................................................................ 5-29
6 PROFINET ............................................................................................................................................. 6-1
6.1 Introduction ................................................................................................................................ 6-1
6.2 PROFINET IO and PROFINET CBA ......................................................................................... 6-2
6.3 PROFINET IO Systems ............................................................................................................. 6-4
6.4 Blocks in PROFINET IO............................................................................................................. 6-6
6.5 System status lists for PROFINET IO ........................................................................................6-8
6.6 Open Communication Via Industrial Ethernet.......................................................................... 6-10
6.7 SNMP Communication Service................................................................................................ 6-13
6.8 PN/IO Address Areas of the CPUs 41x-3PN/DP ..................................................................... 6-14
7 Consistent Data ...................................................................................................................................... 7-1
7.1 Basics......................................................................................................................................... 7-1
7.2 Consistency for communication blocks and functions ............................................................... 7-2
7.3 Consistent Reading and Writing of Data from and to DP Standard Slaves/IO Devices ............ 7-3

Table of contents
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0 v
8 Storage Concept and Startup Types....................................................................................................... 8-1
8.1 Overview of the memory concept of S7-400 CPUs ................................................................... 8-1
8.2 Overview of the startup scenarios for S7-400 CPUs ................................................................. 8-4
9 Cycle and Response Times of the S7-400.............................................................................................. 9-1
9.1 Cycle time .................................................................................................................................. 9-1
9.2 Cycle Time Calculation .............................................................................................................. 9-3
9.3 Different cycle times................................................................................................................... 9-6
9.4 Communication Load ................................................................................................................. 9-9
9.5 Reaction Time.......................................................................................................................... 9-13
9.6 Calculating cycle and reaction times .......................................................................................9-20
9.7 Examples of Calculating the Cycle Time and Reaction Time.................................................. 9-21
9.8 Interrupt Reaction Time ........................................................................................................... 9-24
9.9 Example: Calculating the Interrupt Reaction Time .................................................................. 9-26
9.10 Reproducibility of Time-Delay and Watchdog Interrupts ......................................................... 9-27
9.11 CBA response times ................................................................................................................ 9-28
10 Technical specifications........................................................................................................................ 10-1
10.1 Technical Specification of the CPU 414-3 PN/DP; (6ES7414-3EM05-0AB0) ......................... 10-1
10.2 Technical Specification of the CPU 416-3 PN/DP; (6ES7416-3ER05-0AB0) ....................... 10-16
10.3 Technical Specification of the CPU 416-3F PN/DP; (6ES7416-3FR05-0AB0) ..................... 10-28
10.4 Technical specifications of the memory cards....................................................................... 10-40
11 IF 964-DP interface module.................................................................................................................. 11-1
11.1 Using the IF 964-DP interface module..................................................................................... 11-1
11.2 Pin assignment of the IF 964-DP interface module ................................................................. 11-3
11.3 Technical specifications ........................................................................................................... 11-4
Index................................................................................................................................................ Index-1

Table of contents
S7-400 Automation System, CPU Specifications
vi Manual, 10/2006, 6ES7498-8AA04-8BA0
Tables
Table 2-1 LEDs of the CPUs ...................................................................................................................... 2-2
Table 2-2 Faults/Errors and the reactions of the CPU ............................................................................... 2-5
Table 2-3 Possible states of the RUN and STOP LEDs ............................................................................ 2-8
Table 2-4 Possible statuses of the INTF, EXTF and FRCE LEDs ............................................................. 2-9
Table 2-5 Possible states of the BUS1F and BUS5F LEDs....................................................................... 2-9
Table 2-6 Possible states of the IFM1F LED ............................................................................................. 2-9
Table 2-7 Possible states of the LINK and RX/TX LEDs ......................................................................... 2-10
Table 2-8 Mode selector switch settings .................................................................................................. 2-11
Table 2-9 Security classes of an S7-400 CPU......................................................................................... 2-12
Table 2-10 MPI parameters and IP address following memory reset ........................................................ 2-14
Table 2-11 Types of Memory Cards........................................................................................................... 2-20
Table 3-1 Properties of the CPU in the factory state................................................................................ 3-12
Table 3-2 LED patterns ............................................................................................................................ 3-13
Table 4-1 Communication services of the CPUs ....................................................................................... 4-6
Table 4-2 SFCs for the Basic S7 Communication...................................................................................... 4-8
Table 4-3 SFBs for the basic S7 communication..................................................................................... 4-10
Table 4-4 SFCs for the Global Data Communication...............................................................................4-11
Table 4-5 GD resources of the CPUs....................................................................................................... 4-12
Table 4-6 Distribution of connections....................................................................................................... 4-21
Table 4-7 Availability of connection resources......................................................................................... 4-21
Table 5-1 41x CPUs (MPI/DP interface and DP module as PROFIBUS DP)............................................ 5-2
Table 5-2 Meaning of the "BUSF" LED of the CPU 41x as DP master...................................................... 5-6
Table 5-3 Reading out the diagnostics with STEP 7.................................................................................. 5-7
Table 5-4 Diagnostic addresses for the DP master and DP slave............................................................. 5-9
Table 5-5 Event detection of the CPUs 41x as DP master ...................................................................... 5-10
Table 5-6 Evaluation of RUN-STOP transitions of the DP slave in the DP master ................................. 5-10
Table 5-7 Configuration example for the address areas of the transfer memory .................................... 5-12
Table 5-8 Meaning of the "BUSF" LEDs of the CPU 41x as DP slave .................................................... 5-16
Table 5-9 Reading out the diagnostic data with STEP 5 and STEP 7 in the master system................... 5-17
Table 5-10 STEP 5 User Program ............................................................................................................. 5-18
Table 5-11 Diagnostic addresses for the DP master and DP slave........................................................... 5-19
Table 5-12 Event detection of the CPUs 41x as DP slave.........................................................................5-19
Table 5-13 Evaluating RUNSTOP transitions in the DP Master/DP Slave ................................................ 5-20
Table 5-14 Structure of station status 1 (Byte 0)........................................................................................ 5-21
Table 5-15 Structure of station status 2 (Byte 1)........................................................................................ 5-22

Table of contents
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0 vii
Table 5-16 Structure of station status 3 (Byte 2) ....................................................................................... 5-22
Table 5-17 Structure of the master PROFIBUS address (byte 3).............................................................. 5-23
Table 5-18 Diagnostic address for the recipient during direct data exchange........................................... 5-30
Table 5-19 Event detection of the 41x CPUs as recipients during direct communication ......................... 5-30
Table 5-20 Evaluation of the station failure in the sender during direct data exchange ............................ 5-31
Table 6-1 New System and Standard Functions/System and Standard Functions to be Replaced.......... 6-6
Table 6-2 System and Standard Functions in PROFIBUS DP that must be Implemented with
Different Functions in PROFINET IO......................................................................................... 6-7
Table 6-3 OBs in PROFINET IO and PROFIBUS DP................................................................................ 6-7
Table 6-4 Comparison of the System Status Lists of PROFINET IO and PROFIBUS DP........................ 6-8
Table 6-5 PROFINET IO address areas of the CPUs.............................................................................. 6-14
Table 8-1 Memory requirements ................................................................................................................ 8-2
Table 9-1 Cyclic program processing......................................................................................................... 9-1
Table 9-2 Factors that Influence the Cycle Time ....................................................................................... 9-3
Table 9-3 Portions of the process image transfer time .............................................................................. 9-4
Table 9-4 Operating System Scan Time at the Scan Cycle Checkpoint ................................................... 9-5
Table 9-5 Increase in cycle time by nesting interrupts............................................................................... 9-5
Table 9-6 Reducing the Response Time.................................................................................................. 9-18
Table 9-7 Example of Calculating the Response Time............................................................................ 9-20
Table 9-8 Calculating the Interrupt Response Time ................................................................................ 9-24
Table 9-9 Hardware Interrupt and Diagnostic Interrupt Response Times; Maximum Interrupt
Response Time Without Communication ................................................................................ 9-24
Table 9-10 Reproducibility of Time-Delay and Watchdog Interrupts of the CPUs..................................... 9-27
Table 9-11 Response time for acyclic interconnections............................................................................. 9-30
Table 11-1 Female connector IF1 IF 964-DP (9-pin D-sub) ...................................................................... 11-3

S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0 1-1
Introduction 1
Purpose of the manual
The information contained in this manual can be used as a reference for operating, for
descriptions of the functions, and for the technical specifications of the CPUs of the S7-400.
How to configure, assemble and wire these and further modules in an S7-400 system is
described in the
S7-400 Programmable Controller; Hardware and Installation manual for
each system.
Basic Knowledge Required
To understand this manual, you should have general experience in the field of automation
engineering.
You should also have experience of working with computers or PC-type tools (for example
programming devices) and the Windows operating system 2000 or XP. Since the S7-400 is
configured with the STEP 7 basic software, you should also have experience of working with
the basic software. You can acquire this knowledge in the manual
Programming with
STEP 7
.
In particular when using an S7-400 in areas subject to safety regulations, note the
information relating to the safety of electronic controllers in the Appendix of the manual
S7-400 Programmable Controller; Hardware and Installation manual.
Range of Validity of This Manual
The manual is valid for the S7-400 automation system. It applies to the CPUs listed below:
● CPU 414-3 PN/DP; (6ES7414-3EM05-0AB0)
● CPU 416-3 PN/DP; (6ES7416-3ER05-0AB0)
● CPU 416-3F PN/DP; (6ES7416-3FR05-0AB0)
General Technical Data
You will find information about certificates, approvals and standards in the manual S7-400
Programmable Controller; Module Specifications
.

Introduction
S7-400 Automation System, CPU Specifications
1-2 Manual, 10/2006, 6ES7498-8AA04-8BA0
Related Documentation
This manual is part of the documentation package for S7-400.
System Documentation package
S7-400 • S7-400 Automation System; Hardware and Installation
• S7-400 Automation Systems; Module Specifications
• Instruction List S7-400
• S7-400 Automation System; CPU Specifications
Orientation
The manual contains various features that allow you to find specific information more quickly:
● At the start of the manual you will find a complete table of contents and a list of the
diagrams and tables that appear in the manual.
● Finally, a comprehensive index allows quick access to information on specific subjects.
Recycling and Disposal
The S7-400 is low in contaminants and can therefore be recycled. Contact a certified
electronic-waste disposal company for information and help on environmentally-friendly
recycling and disposal of your old equipment.
Further Assistance
Please talk to your Siemens contact at one of our representatives or local offices if you have
questions about the products described here and do not find the answers in this manual.
You will find information on who to contact at:
http://www.siemens.com/automation/partner
A signpost to the documentation of the various SIMATIC products and systems is available
at:
http://www.siemens.com/simatic-tech-doku-portal
The online catalog and online ordering system is available at:
http://mall.ad.siemens.com/
Training Center
We offer various courses for newcomers to the SIMATIC S7 automation system. For details,
please contact your regional training center or our central training center in 90327
Nuremberg, Germany:
Phone: [phone].
Internet: http://www.sitrain.com

Introduction
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0 1-3
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Introduction
S7-400 Automation System, CPU Specifications
1-4 Manual, 10/2006, 6ES7498-8AA04-8BA0

S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0 2-1
Structure of a CPU 41x 2
2.1 Control and display elements of the CPUs
Control and Display Elements of the CPU 41x-3PN/DP
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Figure 2-1 Location of the Control and Display Elements of the CPU 41x-3PN/DP

Structure of a CPU 41x
2.1 Control and display elements of the CPUs
S7-400 Automation System, CPU Specifications
2-2 Manual, 10/2006, 6ES7498-8AA04-8BA0
LEDs
The table below gives you an overview of the LEDs on the individual CPUs.
Table 2-1 LEDs of the CPUs
Exists on CPU
LED Color Meaning
414-3 PN/DP
416-3 PN/DP
416F-3 PN/DP
INTF Red Internal fault x
EXTF Red External fault x
FRCE Yellow Force job active x
MAINT Not assigned x
RUN Green RUN mode x
STOP Yellow STOP mode x
BUS1F Red Bus fault on MPI/PROFIBUS DP
interface 1
x
BUS5F Red Features of the PROFINET interface x
IFM1F Red Fault on interface module 1 x
Mode Selector Switch
You can use the mode selector switch to set the current mode of the CPU. The mode
selector is a three-position toggle switch.
Memory Card Slot
You can insert a memory card into this slot.
There are two types of memory cards:
● RAM cards
You can expand CPU load memory with the RAM card.
● Flash cards
The flash card is non-volatile storage for storing your user program and data (no backup
battery necessary). You can program the flash card either on the programming device or
in the CPU. The flash card also expands the load memory of the CPU.
Slot for Interface Modules
You can insert one PROFIBUS DP module for the CPU 41x-3 and CPU 41x-4 in this slot.

Structure of a CPU 41x
2.1 Control and display elements of the CPUs
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0 2-3
MPI/DP Interface
You can connect various devices to the MPI interface of the CPU, for example:
● Programming devices
● Operator control and monitoring devices
● Other S7-400 or S7-300 controllers
Use the bus connection connector with oblique cable outlet, see the manual
S7-400
Automation System, Hardware and Installation
.
You can also configure the MPI interface as a DP master so that you can use it as
PROFIBUS DP interface with up to 32 DP slaves.
PROFIBUS DP Interface
You can connect the distributed I/O, programming devices/OPs and other DP master
stations to the PROFIBUS DP interface.
PROFINET Interface
You can connect PROFINET IO devices to the PROFINET interface. The PROFINET
interface has 2 RJ 45 sockets and is equipped with a 2-port switch. The PROFINET interface
provides the connection to the Industrial Ethernet, CBA, etc..
Caution
You can only connect to a LAN with this interface. You cannot connect to the public
telecommunication network.
Power Supply, External Backup Voltage at the "EXT.-BATT." Jack
You can install either one or two backup batteries in the S7-400 power supply modules,
depending on the module type to achieve the following:
● You back up the user program stored in RAM.
● You retain the values of flags, timers, counters, system data and the data in dynamic
DBs.
● You back up the internal clock.
You can achieve the same backup by supplying a voltage between 5 V DC and 15 V DC to
the "EXT.-BATT." jack of the CPU.
The "EXT.-BATT." input has the following features:
● Polarity reversal protection
● Short-circuit current limited to 20 mA

Structure of a CPU 41x
2.1 Control and display elements of the CPUs
S7-400 Automation System, CPU Specifications
2-4 Manual, 10/2006, 6ES7498-8AA04-8BA0
You need a cable with a 2.5 mm Ø jack plug to connect the power supply to the "EXT.-
BATT" jack, as shown in the following illustration. Make sure the polarity of the jack plug is
correct.
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Figure 2-2 Connecting Cable with Jack Plug
You can order a jack plug with an assembled cable from the Electronic Plant Karlsruhe
under the order number A5E00728552A.
Note
You require the external power supply to the "EXT.-BATT." jack when you replace a power
supply module and want to backup the user program stored in RAM and the data mentioned
above while you are replacing the module.
See also
Monitoring functions of the CPU (Page 2-5)
Status and error displays (Page 2-8)
Multipoint Interface (MPI) (Page 2-21)

Structure of a CPU 41x
2.2 Monitoring functions of the CPU
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0 2-5
2.2 Monitoring functions of the CPU
Monitoring Functions and Error Messages
The CPU hardware and the operating system monitoring functions ensure proper functioning
of the system and a defined reaction to faults and errors. Certain error events also trigger a
reaction in the user program. When recursive errors occur, the LED is switched off with the
next incoming error.
The table below provides an overview of possible errors, their causes and the reactions of
the CPU.
Table 2-2 Faults/Errors and the reactions of the CPU
Type of error Cause of error Response of the operating system Fault LED
Access error
(entering state)
Module failure (SM, FM, CP)
I/O read access error
I/O write access error
The "EXTF" LED stays lit until the
error is acknowledged.
With SMs:
• OB 122 call
• Entry in the
diagnostic buffer
• With input modules:
"NULL" entered as
data in the
accumulator or the
process image
With other modules:
• OB 122 call
If the OB is not loaded: The CPU
changes to STOP
EXTF
Timeout error
(entering state)
• The user program
execution time (OB1
and all interrupt and
error OBs) exceeds
the specified
maximum cycle time.
• OB request error
• Overflow of the
startup information
buffer
• Watchdog interrupt
• Resume RUN after
CiR
The "INTF" LED is lit until the error is
acknowledged.
OB 80 call
If the OB is not loaded: The CPU
changes to STOP
INTF
Faulty power supply
module(s), (not mains
failure),
(entering and exiting
state)
In the central or expansion rack
• At least one backup
battery of the power
supply module is
exhausted
• Backup voltage is
missing
• The 24 V DC supply
of the power supply
module has failed
OB 81 call
If the OB is not loaded: The CPU
remains in RUN.
EXTF

Structure of a CPU 41x
2.2 Monitoring functions of the CPU
S7-400 Automation System, CPU Specifications
2-6 Manual, 10/2006, 6ES7498-8AA04-8BA0
Type of error Cause of error Response of the operating system Fault LED
Diagnostic interrupt
(entering and exiting
state)
An I/O module with interrupt capability
reports a diagnostic interrupt
OB 82 call
If the OB is not loaded: The CPU
changes to STOP
EXTF
Remove/insert module
interrupt
(entering and exiting
state)
Removal or insertion of an SM and
insertion of the wrong module type. The
LED EXTF does not light up if only one
SM is installed and then removed while
the CPU is in STOP (default setting).
The LED lights up briefly when the SM
is inserted again.
OB 83 call
If the OB is not loaded: The CPU
changes to STOP
EXTF
CPU Hardware
error
(entering state)
• A memory error was
detected and
eliminated
OB 84 call
If the OB is not loaded: The CPU
remains in RUN.
INTF
Priority class error
(Only entering state,
depending on OB85
mode)
• A priority class is
called, but the
corresponding OB is
not present.
• In the case of an SFB
call: The instance DB
is missing or bad.
• Error while updating
the process image
OB 85 call
If the OB is not loaded: The CPU
changes to STOP
INTF
EXTF
Rack / station failure
(entering and exiting
state)
• Power failure on an
expansion module
• PROFINET DP chain
failure
• PROFINET IO
subsystem failure
• Failure of a coupling
chain: missing or
defective IM, cable
break)
OB 86 call
If the OB is not loaded: The CPU
changes to STOP
EXTF
Communication error
(entering state)
• Unable to enter
status information in
the DB (shared data
communication)
• Incorrect message
frame (shared data
communication)
• Incorrect message
length (shared data
communication)
• Error in the structure
of the shared data
frame (shared data
communication)
• DB access error
OB 87 call INTF

Structure of a CPU 41x
2.2 Monitoring functions of the CPU
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0 2-7
Type of error Cause of error Response of the operating system Fault LED
Execution abort
(entering state)
• Synchronous error
nesting depth
exceeded
• Too many nested
block calls (B stack)
• Error when allocating
local data
OB 88 call
If the OB is not loaded: The CPU
changes to STOP
INTF
Programming error
(entering state)
Errors in the user program
• BCD conversion error
• Range length error
• Range error
• Alignment error
• Write error
• Timer number error
• Counter number error
• Block number error
• Block not loaded
OB 121 call
If the OB is not loaded: The CPU
changes to STOP
INTF
Code error
(entering state)
Error in the compiled user program (for
example, illegal OP code or a jump
beyond block end)
The CPU changes to STOP
Restart or CPU memory reset
required.
INTF
Loss of the clock
signal
(entering state)
When using isochronous mode: Clock
pulses were lost either because OB61
... 64 was not started due to higher
priorities, or because additional
asynchronous bus loads suppressed the
bus clock pulses.
OB 80 call
If the OB is not loaded: The CPU
changes to STOP
Call of OB 61..64 at the next pulse.
INTF
Further test and information functions are available in each CPU and you can invoke these in
STEP 7.

Structure of a CPU 41x
2.3 Status and error displays
S7-400 Automation System, CPU Specifications
2-8 Manual, 10/2006, 6ES7498-8AA04-8BA0
2.3 Status and error displays
Status LEDs
The RUN and STOP LEDs on the front panel of the CPU indicate the current CPU mode.
Table 2-3 Possible states of the RUN and STOP LEDs
LED
RUN STOP
Meaning
H D CPU is in RUN.
D H CPU is in STOP. The user program is not executed. Cold restart, restart and warm
restart/reboot is possible. If STOP was triggered by an error, the error LED (INTF
or EXTF) is also set.
B
2 Hz
B
2 Hz
CPU is in DEFECTIVE status. The INTF, EXTF, FRCE, BUSF1, BUSF5 and
IFM1F LEDs also flash.
B
0.5 Hz
H CPU HOLD was triggered by a test function.
B
2 Hz
H A warm restart / cold restart / hot restart was triggered. It can take a minute or
longer to execute these functions, depending on the length of the OB called. If the
CPU still does not change to RUN, there may be an error in the system
configuration.
x B
0.5 Hz
The CPU requests memory reset.
x B
2 Hz
Memory reset in progress or the CPU is currently being initialized following
POWER ON.
D = LED is dark; H = LED is lit; B = LED flashes at the specified frequency; x = LED status is
irrelevant