Siemens SIMATIC NET CP 343-1 ERPC User manual

CP 343- 
1 ERPC
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SIMATIC NET
S7-CPs for Industrial Ethernet
CP 343-1 ERPC
Manual
Manual Part B
03/2010
C79000-G8976-C239-02
Preface
Properties / services
1
Requirements for use
2
Installation and
commissioning
3
LED displays
4
Performance data / operation
5
ERPC functions
6
The CP as Web server
7
Further notes on operation
8
How to load new firmware
9
Technical specifications
10
Other information available
about the CP
11
Approvals
A
Training, Service & Support
B
References
C
Error messages of the ERPC
application
D

Legal information
Legal information
Warning notice system
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
with a safety alert symbol, indicates that minor personal injury can result if proper precautions are not taken.
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
account.
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 product/system described in this documentation may be operated only by personnel qualified for the specific
task in accordance with the relevant documentation for the specific task, in particular its warning notices and
safety instructions. Qualified personnel are those who, based on their training and experience, are capable of
identifying risks and avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be adhered to. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of the Siemens AG. The remaining trademarks in this
publication may be trademarks whose use by third parties for their own purposes could violate the rights of the
owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.
Siemens AG
Industry Sector
Postfach 48 48
90026 NÜRNBERG
GERMANY
order number: C79000-G8976-C239
Ⓟ 04/2010
Copyright © Siemens AG 2010.
Technical data subject to change

CP 343-1 ERPC
Manual, 03/2010, C79000-G8976-C239-02 3
Preface
Product names
This document contains information on the following product:
CP 343-1 ERPC
Order number 6GK7 343−1FX00−0XE0
Hardware product version 1
Firmware version V1.0
for SIMATIC S7−300.
In this document, the term "CP" is used instead of the full product name.
1
3
2
1
2
3
C-PLUG (rear of device)
Order number
X = placeholder for hardware product version
CP 343-1 ERPC
Address label: Unique MAC address preset for the CP
The CP ships with a MAC address preset in the factory for the Ethernet interface.
The MAC address is printed on the housing behind the hinged front panel.
Cooperation partner for ERPC functions
Cooperation partner for ERPC functions is:
ILS Technology LLC
5300 Broken Sound Blvd. Suite 150
Boca Raton, FL, USA, 33487
Phone: [phone] x 124
Fax: [phone]
E-mail: [e-mail]

Preface
CP 343-1 ERPC
4 Manual, 03/2010, C79000-G8976-C239-02

CP 343-1 ERPC
Manual, 03/2010, C79000-G8976-C239-02 5
Table of contents
Preface ...................................................................................................................................................... 3
1 Properties / services .................................................................................................................................. 9
1.1 Application......................................................................................................................................9
1.2 Communication services..............................................................................................................10
1.3 Other services..............................................................................................................................11
2 Requirements for use .............................................................................................................................. 13
2.1 Operation in controller device families.........................................................................................13
2.2 Configuration................................................................................................................................14
2.3 Programming................................................................................................................................15
3 Installation and commissioning................................................................................................................ 17
3.1 Important notes on using the device............................................................................................17
3.2 Procedure for installation and commissioning .............................................................................18
3.3 C-PLUG (configuration plug)........................................................................................................21
3.4 Module replacement ....................................................................................................................23
3.5 Controlling the operating mode....................................................................................................25
4 LED displays............................................................................................................................................ 27
5 Performance data / operation .................................................................................................................. 31
5.1 Transmission and reaction times .................................................................................................31
5.2 Number of possible connections over Ethernet...........................................................................31
5.3 S7 communication characteristics ...............................................................................................32
5.4 Characteristics of the SEND/RECEIVE interface ........................................................................32
5.5 Characteristics of the ERPC functions.........................................................................................34
5.6 Characteristics of the C-PLUG.....................................................................................................34
5.7 Memory organization ...................................................................................................................35
6 ERPC functions ....................................................................................................................................... 39
6.1 Overview ......................................................................................................................................39
6.1.1 The ERPC functions ....................................................................................................................39
6.1.2 Procedure for using the ERPC functions .....................................................................................40
6.2 ERPC services and communication ............................................................................................41
6.2.1 Communication between S7 station and ERP subscriber ...........................................................41
6.2.2 System overview..........................................................................................................................42
6.2.3 Reading and writing data .............................................................................................................43
6.2.4 The logical trigger ........................................................................................................................44
6.2.5 ERPC communication between CP and CPU .............................................................................46
6.3 Configuration................................................................................................................................47

Table of contents
CP 343-1 ERPC
6 Manual, 03/2010, C79000-G8976-C239-02
6.3.1 Overview of ERPC configuration ................................................................................................ 47
6.3.2 Basic configuration in STEP 7..................................................................................................... 49
6.3.3 Configuration of the symbol table and the ERPC symbols......................................................... 49
6.3.4 Configuration of FB56 ................................................................................................................. 52
6.4 Downloading ERPC configuration data....................................................................................... 52
6.5 Diagnostics of the ERPC functions ............................................................................................. 53
7 The CP as Web server ............................................................................................................................ 55
8 Further notes on operation....................................................................................................................... 57
8.1 Clear/reset and reset................................................................................................................... 57
8.2 Network settings with Fast Ethernet / gigabit Ethernet............................................................... 58
8.2.1 Fast Ethernet............................................................................................................................... 58
8.2.2 Gigabit Ethernet .......................................................................................................................... 60
8.3 Influence of MPI on connections via Industrial Ethernet............................................................. 61
8.4 IP configuration ........................................................................................................................... 61
8.4.1 Configured S7 connections cannot be operated if the IP address is assigned over DHCP....... 61
8.4.2 Detection of double IP addressing in the network ...................................................................... 62
8.4.3 Obtain IP address vie DHCP: CP STOP on expiry of the lease ................................................. 62
8.5 Setting the CPU time of day by the CP....................................................................................... 62
8.6 Time-of-day synchronization....................................................................................................... 63
8.7 SNMP agent................................................................................................................................ 64
8.8 Possible security holes: Prevent unauthorized access............................................................... 66
8.9 Interface in the user program...................................................................................................... 67
8.9.1 Programmed communication connections with FB55 IP_CONFIG ............................................ 67
8.9.2 IP access protection with programmed communication connections ......................................... 67
8.9.3 Programmed communications connections - Assigning parameters to the port ........................ 67
9 How to load new firmware........................................................................................................................ 69
9.1 Firmware overview ...................................................................................................................... 69
9.2 Downloading the ERPC firmware ............................................................................................... 69
9.3 Downloading Siemens firmware ................................................................................................. 70
10 Technical specifications........................................................................................................................... 71
11 Other information available about the CP ................................................................................................ 73
A Approvals................................................................................................................................................. 75
B Training, Service & Support..................................................................................................................... 77
C References .............................................................................................................................................. 79
D Error messages of the ERPC application................................................................................................. 83
Glossary .................................................................................................................................................. 85
Index........................................................................................................................................................ 95

CP 343-1 ERPC
Manual, 03/2010, C79000-G8976-C239-02 7
Properties / services 1
1.1 Application
Automation system
The CP 343-1 ERPC communications processor is designed for operation in a SIMATIC
S7-300 automation system. It allows connection of the S7-300 to Industrial Ethernet.
Ethernet interface
To allow connection to Ethernet, the CP also has an interface complying with the gigabit
standard IEEE 802.3ab. The Ethernet interface supports autocrossing, autonegotiation and
autosensing.
ERPC functions
The ERPC functions allow communication by the CP 343-1 ERPC via LAN to an ERP
subscriber, for example, an ERP system or an MES. The ERPC application that runs on the
CP 343-1 ERPC handles the communication between the S7 station at the automation level
and ERP system at the enterprise management level.
You will find the requirements for this communication in section Procedure for using the
ERPC functions (Page 40).

Properties / services
1.2 Communication services
CP 343-1 ERPC
8 Manual, 03/2010, C79000-G8976-C239-02
1.2 Communication services
Supported communication services
The CP supports the following communication services:
● S7 communication and PG/OP communication with the following functions:
– PG functions (including routing)
– Operator control and monitoring functions (HMI)
Multiplexing PG/OP connections
– Client and server for data exchange via communication blocks on S7 connections
configured at both ends
Communication blocks: FB12, FB13, FB14, FB15, FB8, FB9, FC62
(see also STEP 7 online help or the manual "System Software for S7-300/400 System
and Standard Functions")
– Server for data exchange on S7 connections configured at one end only without
communication blocks on the S7300 / C7300 station
● Open communication services with the following functions:
– SEND/RECEIVE interface over ISO-on-TCP, TCP and UDP connections
In UDP broadcast, only sending of frames is supported, not receipt.
UDP frame buffering on the CP can be disabled during configuration. When
necessary, this allows you to achieve a shorter reaction time between the arrival of a
UDP frame and its evaluation on the CPU.
– Multicast over UDP connection
The multicast mode is made possible by selecting a suitable IP address when
configuring connections.
– FETCH/WRITE services (server; corresponding to S5 protocol) via TCP connections
The addressing mode can be configured for FETCH/WRITE access as the S7 or S5
addressing mode.
– LOCK/UNLOCK with FETCH/WRITE services
– Connection diagnostics from the user program
● ERPC communication
In conjunction with the software components of our cooperation partners
ILS Technology LLC, the CP supports ERPC communication. Frames are exchanged
between the S7 station and ERP subscribers using TCP/IP. The following methods are
available for data transfer:
– Write/read jobs
Data is read cyclically or spontaneously from the S7-CPU and sent to the ERP
subscribers or written to the CPU by the ERP subscribers.
– Event-oriented transmission, configured as a logical trigger and fires by the user
program on the CPU
When certain events occur, data is read from the CPU and sent to the ERP
subscriber.
Apart from software blocks for the logical trigger, no resources are required on the CPU
for ERPC communication.

Properties / services
1.3 Other services
CP 343-1 ERPC
Manual, 03/2010, C79000-G8976-C239-02 9
1.3 Other services
Other services
● Time-of-day synchronization over Industrial Ethernet using the following configurable
modes:
– SIMATIC mode
The CP receives MMS time messages and synchronizes its local time and the time of
the CPU.
(accuracy approx. +/- 0.5 seconds)
You can choose whether or not the time of day is forwarded. The forwarding direction
can also be selected (station → LAN or LAN → station).
or
– NTP mode (NTP: Network Time Protocol)
The CP sends time-of-day queries at regular intervals to an NTP server and
synchronizes its local time of day and the time of the CPU (accuracy approx. +/- 0.5
seconds).
● Addressing using a factory-set MAC address
The CP can be reached via the default MAC address to allow an IP address to be
assigned.
● SNMP agent
The CP supports data queries over SNMP in version V1. It delivers the content of certain
MIB objects according to the MIB II standard and LLDP MIB.
● Time of day for the diagnostic buffer
If a time master exists (using the NTP or SIMATIC mode), the time for CPinternal
diagnostic buffer is synchronized over the backplane bus or LAN.
● Module access protection
To protect the module from accidental or unauthorized access, protection can be
configured at various levels.
● IP access protection (IP-ACL)
Communication via the CP of the local S7 station can be restricted to partners with
specific IP addresses.
● IP configuration
For the Ethernet interface, you can configure how and with which method the CP is
assigned the IP address, the subnet mask and the address of a gateway.
As an alternative to STEP 7, the CP can be assigned the connection configuration via a
block interface in the user program (FB55: IP_CONFIG) (does not apply to S7
connections).

Properties / services
1.3 Other services
CP 343-1 ERPC
10 Manual, 03/2010, C79000-G8976-C239-02
● Web diagnostics
With the aid of Web diagnostics, you can read out the diagnostic data from a station
connected via the CP to a PG/PC with an Internet browser.
This makes it possible, for example, to read the diagnostic buffers of the intelligent
modules in the rack.
If you do not require this function, you can disable it in the STEP 7 configuration and
disable the port (properties dialog of the CP > “IP Access Protection" tab).

CP 343-1 ERPC
Manual, 03/2010, C79000-G8976-C239-02 11
Requirements for use 2
2.1 Operation in controller device families
SIMATIC families
The CP can be operated in the following device families:
● S7-300 stations with the CPU types
– Standard
– Compact
– Modular
The following table shows the devices with which the CP can be operated with this range of
functions.
NOTICE
The table lists the CPUs and devices approved at the time of printing this manual. S7300
CPUs approved later and not listed in the table also support the range of functions
described here.
Table 2- 1 Use of the CP with S7300
CPU Order number
CPU 312 6ES7 312-1AD10-0AB0
6ES7 312-1AE13-0AB0
CPU 312C 6ES7 312-5BD01-0AB0
6ES7 312-5BE01-0AB0
6ES7 312-5BE03-0AB0
CPU 313C-2 DP 6ES7 313-6CE01-0AB0
6ES7 313-6CF03-0AB0
CPU 313C-2 PtP 6ES7 313-6BE01-0AB0
6ES7 313-6BF03-0AB0
CPU 314 6ES7 314-1AF11-0AB0
6ES7 314-1AG13-0AB0
CPU 314C-2 DP 6ES7 314-6CF02-0AB0
6ES7 314-6CG03-0AB0
CPU 314C-2 PtP 6ES7 314-6BF02-0AB0
6ES7 314-6BG03-0AB0
CPU 315-2 DP 6ES7 315-2AG10-0AB0
CPU 315-2 PN/DP 6ES7 315-2EG10-0AB0
6ES7 315-2EH13-0AB0

Requirements for use
2.2 Configuration
CP 343-1 ERPC
12 Manual, 03/2010, C79000-G8976-C239-02
CPU Order number
CPU 315F-2 DP 6ES7 315-6FF01-0AB0
CPU 315F-2 PN/DP 6ES7 315-2FH10-0AB0
6ES7 315-2FH13-0AB0
CPU 315T-2 DP 6ES7 315-6TG10-0AB0
CPU 317-2 DP 6ES7 317-2AJ10-0AB0
CPU 317-2 PN/DP 6ES7 317-2EJ10-0AB0
6ES7 317-2EK13-0AB0
CPU 317F-2 DP 6ES7 317-6FF00-0AB0
6ES7 317-6FF03-0AB0
CPU 317F-2 PN/DP 6ES7 317-2FJ10-0AB0
6ES7 317-2FK13-0AB0
CPU 317T-2 DP 6ES7 317-6TJ10-0AB0
CPU 318-2 6ES7 318-2AJ00-0AB0
CPU 319-3 PN/DP 6ES7 318-3EL00-0AB0
2.2 Configuration
STEP 7 version required
The following version of STEP 7 is required:
STEP 7 version Functions of the CP
STEP 7 V5.4
+ Service Pack 5
+ Hotfix 5
+ Hardware Support Package HSP 1032
Required for configuration in STEP 7 (hardware catalog of
HW Config) and the ERPC functions
Installation of the Hardware Support Package HSP 1032
You will find the HSP on the Internet at the following address:
ID 23183356 (http://support.automation.siemens.com/WW/view/en/23183356)
Install the HSP in STEP 7 / HW Config in the "Options" menu with the "Install Hardware
Updates" menu command. You will find further information in the STEP 7 online help (under
"HSP" or "Hardware update").
After installing the HSP, close STEP 7. After restarting STEP 7, the CP is in the catalog of
HW Config.
Downloading the STEP 7 configuration data
You can download the configuration data to the CP via the MPI interface of the CPU and the
backplane bus or directly over LAN/Industrial Ethernet. For more detailed information, refer
to section Downloading ERPC configuration data (Page 52).

Requirements for use
2.3 Programming
CP 343-1 ERPC
Manual, 03/2010, C79000-G8976-C239-02 13
2.3 Programming
Programming - FCs / FBs
For some communications services, there are pre-programmed blocks (FCs/FBs) available
as the interface in your STEP 7 user program.
Refer to the documentation of the FCs / FBs in the online help of STEP 7 or in the manual
/6/.
NOTICE
Current block versions
We recommend that you always use the latest block versions for all module types.
You will find information on the latest block version and links to download the current blocks
in our Customer Support area on the Internet:
Link to the blocks: (http://support.automation.siemens.com/WW/news/en/8797900)
If you are using older block types, this recommendation only applies if you also have the
latest firmware version.
CAUTION
Block call
The communication blocks for S7300 (SIMATIC NET block libraries for S7300 in STEP 7)
must not be called in more than one priority class! If, for example, you call a communication
block in OB1 and in OB35, block execution could be interrupted by the higherpriority OB.
If you call blocks in more than one OB, you must write your program so that a
communication block that is currently executing cannot be interrupted by another
communication block (for example by disabling/enabling SFC interrupts).

Requirements for use
2.3 Programming
CP 343-1 ERPC
14 Manual, 03/2010, C79000-G8976-C239-02

CP 343-1 ERPC
Manual, 03/2010, C79000-G8976-C239-02 15
Installation and commissioning 3
3.1 Important notes on using the device
Safety notices on the use of the device
The following safety notices must be adhered to when setting up and operating the device
and during all work relating to it such as installation, connecting up, replacing devices or
opening the device.
General notices
WARNING
Safety extra low voltage
The equipment is designed for operation with Safety Extra-Low Voltage (SELV) by a
Limited Power Source (LPS).
This means that only SELV / LPS complying with IEC 60950-1 / EN 60950-1 / VDE 0805-1
must be connected to the power supply terminals. The power supply unit for the equipment
power supply must comply with NEC Class 2, as described by the National Electrical Code
(r) (ANSI / NFPA 70).
There is an additional requirement if devices are operated with a redundant power supply:
If the equipment is connected to a redundant power supply (two separate power supplies),
both must meet these requirements.
WARNING
Opening the device
DO NOT OPEN WHEN ENERGIZED.
General notices on use in hazardous areas
WARNING
Risk of explosion when connecting or disconnecting the device
EXPLOSION HAZARD
DO NOT CONNECT OR DISCONNECT EQUIPMENT WHEN A FLAMMABLE OR
COMBUSTIBLE ATMOSPHERE IS PRESENT.

Installation and commissioning
3.2 Procedure for installation and commissioning
CP 343-1 ERPC
16 Manual, 03/2010, C79000-G8976-C239-02
WARNING
Replacing components
EXPLOSION HAZARD
SUBSTITUTION OF COMPONENTS MAY IMPAIR SUITABILITY FOR CLASS I, DIVISION
2 OR ZONE 2.
General notices on use in hazardous areas according to ATEX
WARNING
Requirements for the cabinet/enclosure
When used in hazardous environments corresponding to Class I, Division 2 or Class I,
Zone 2, the device must be installed in a cabinet or a suitable enclosure.
To comply with EU Directive 94/9 (ATEX95), this enclosure must meet the requirements of
at least IP54 in compliance with EN 60529.
WARNING
Suitable cables for temperatures in excess of 70 °C
If the cable or conduit entry point exceeds 70 °C or the branching point of conductors
exceeds 80 °C, special precautions must be taken. If the equipment is operated in an air
ambient in excess of 50 °C, only use cables with admitted maximum operating temperature
of at least 80 °C.
WARNING
Protection against transient voltage surges
Provisions shall be made to prevent the rated voltage from being exceeded by transient
voltage surges of more than 40%. This criterion is fulfilled, if supplies are derived from
SELV (Safety Extra-Low Voltage) only.
3.2 Procedure for installation and commissioning
Installation and commissioning
Note
The module must be installed so that its upper and lower ventilation slits are not covered,
allowing adequate ventilation.
During operation, keep the hinged front panel closed.

Installation and commissioning
3.2 Procedure for installation and commissioning
CP 343-1 ERPC
Manual, 03/2010, C79000-G8976-C239-02 17
Step Execution Meaning / explanation
Install the CP on the S7 standard rail.
Establish the connection via the enclosed bus
connector to the backplane bus.
Slots 4 to 11 are permitted for the CP in racks 0 to 3
(connected by IM 360/361).
Proceed as described in the sections dealing with setup and
wiring, explained in detail in /10/.
1
Note
The CP cannot be used in an extension rack that is connected via the IM 365! Reason: The required
communication bus is not connected to the extension rack via the IM 365.
Connect the CP to the power supply. Follow the steps as described in detail in /10/ when wiring
between the power supply and the CPU.
2
Notes
The CPU, CP and IM (if one exists) must be connected to the same power supply.
Only wire up the S7300 / C7300 with the power switched off!
3 Connect the CP to Industrial Ethernet. Connector behind the hinged front panel
An Ethernet cable can also be inserted and removed with the
power supply on.
4 Optional:
connect the ERP subscribers to the same
Industrial Ethernet network.
This step is only necessary if you want to use ERPC functions.
5 Optional:
Download the ERPC firmware to the CP.
This step is only necessary if you want to use ERPC functions.
Read the relevant documentation of our cooperation partners
ILS Technology LLC.
6 The remaining steps in commissioning involve
downloading the STEP 7 configuration data.
To download the STEP 7 configuration, you can connect the
PG as follows:
via MPI
via Industrial Ethernet
– Addressing the first time
(IP address assignment / node initialization)
– Downloading the defined configuration
For further details, refer to the general Part A of this
manual.
The PG/PC requires a LAN attachment, for example via a CP
1613 and must have the necessary software (for example the
S71613 package or SOFTNET IE). The TCP/IP protocol must
be installed. The protocol used must then be applied to the
S7ONLINE access point.

Installation and commissioning
3.2 Procedure for installation and commissioning
CP 343-1 ERPC
18 Manual, 03/2010, C79000-G8976-C239-02
Step Execution Meaning / explanation
7 Optional:
complete the ILS Workbench configuration
and download this to the CP.
This step is only necessary if you want to use ERPC functions.
Read the relevant documentation of our cooperation partners
ILS Technology LLC.
8 Use the diagnostic functions during
commissioning and to analyze problems.
The following options are available:
The LED displays on the CP
Hardware diagnostics and troubleshooting with STEP 7
Communication diagnostics with STEP 7 / NCM
Diagnostics
Static information using HW Config
Web diagnostics
If applicable, evaluation of the alarm block FB54 in the user
program
Queries via SNMP
1
2
3
4
5
Figure 3-1 CP connectors with the front panel open
1 MAC address
2 Firmware version
3 LAN connector P1 (RJ-45 jack)
4 Chassis ground slider (see below for description)
5 Connecting the power supply
Ground/chassis ground concept
NOTICE
Please note the instructions regarding the grounding and chassis ground concept in the
SIMATIC S7 installation guides; see “SIMATIC S7 Programmable Controller S7300 -
Installation and Hardware: Installation Manual" /10/.
Behind the hinged panel on the left of the device, you will see a slider with which you can
connect or disconnect the chassis ground of the 24 V power supply with reference ground.

Installation and commissioning
3.3 C-PLUG (configuration plug)
CP 343-1 ERPC
Manual, 03/2010, C79000-G8976-C239-02 19
● Chassis ground slider pushed in:
Chassis ground and reference ground connected (note: you can feel the slider lock into
position).
● Chassis ground slider pulled out:
No connection between chassis and reference ground.
When shipped: Slider pushed in
Use a screwdriver to set the slider.
Configuration
To set up the CP for communication services, read the instructions in section Configuration
(Page 14).
3.3 C-PLUG (configuration plug)
Exchangeable C-PLUG
The CP has a receptacle for a configuration plug (known as a C-PLUG) that is supplied as
standard with the device. This can store up to 32 MB of data in nonvolatile memory.
Area of application
The C-PLUG is an exchangeable medium for storing configuration and project engineering
data of the CP. This means that configuration data remains available if the CP is replaced. It
is possible to replace the module without a PG.
How memory is divided up and the data contained in the various areas is explained in
section Memory organization (Page 35).
NOTICE
Startup without C-PLUG
The full CP functions are available only when a C-PLUG is inserted.
If the C-PLUG is missing, the CP starts up but only diagnostic functions are available.
Recommendations for data storage
We recommend that you store the configuration data on the CPU, refer to the option "Save
configuration data on the CPU" in section Module replacement (Page 23).
If the STEP 7 configuration data is extensive, storage of the configuration data on the CP (on
the C-PLUG) is recommended in the following situations:
● The configuration memory on the CPU is inadequate.
● The delays due to the extent of the configuration data when starting up the module are
unacceptable.

Installation and commissioning
3.3 C-PLUG (configuration plug)
CP 343-1 ERPC
20 Manual, 03/2010, C79000-G8976-C239-02
The ERPC firmware is stored in the internal file system of the CP and not on the C-PLUG or
on the CPU. See also section Memory organization (Page 35).
Principle
The power is supplied by the CP. If there is a power down, the C-PLUG retains all data
permanently.
Flash components are used in the C-PLUG in which the number of write operations is
limited. This must be taken into account when using blocks in the user program that write
data to the C-PLUG (for example FB55 with changing IP parameters). Refer to the
information in section Characteristics of the C-PLUG (Page 34).
Inserting in the C-PLUG slot
The slot for the C-PLUG is on the rear panel of the device.
The C-PLUG is inserted in the receptacle.
NOTICE
The C-PLUG must be inserted or removed only when the power is off!
Fitting the C-PLUG (left) and removing it from the CP with a screwdriver (right)
How the C-PLUG works when the CP starts up (module replacement situation)
If the C-PLUG has not yet been written to (as shipped), when the STEP 7 configuration is
downloaded to the CP, all the configuration data of the CP is saved automatically on it. This
does not include the ERPC firmware, the ILS Workbench configuration and the ILS license
file.
If the S7 station had previously been operational and the CP configuration data is stored on
the CPU (option "Save configuration data on the CPU"), an unwritten C-PLUG adopts all the
STEP 7 configuration data from the CPU when the CP starts up. This does not include the
ERPC firmware and the ILS Workbench configuration.
If the C-PLUG is inserted, the basic device automatically uses the configuration data of the
C-PLUG. This assumes that the data was written by a compatible device type.