Siemens CP 342-5 User manual

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SIMATIC NET
S7-300 - PROFIBUS
CP 342-5 / CP 342-5 FO
Manual
Manual Part B
07/2017
C79000
-G8976-C146-10
Preface
Application and functions
1
LEDs and mode selector
2
Installation, connecting up,
commissioning
3
Notes on operation
4
Diagnostics and upkeep
5
Technical specifications
6
Certifications and approvals
A
References
B

Siemens AG
Division Process Industries and Drives
Postfach 48 48
90026 NÜRNBERG
GERMANY
Document order number: C79000-G8976-C146
Ⓟ
08/2017 Subject to change
Copyright © Siemens AG 2010 - 2017.
All rights reserved
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
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
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, 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 complied with. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of 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.

CP 342-5 / CP 342-5 FO
Manual, 07/2017, C79000-G8976-C146-10 3
Preface
①
9-pin D-sub female connector
②
Duplex sockets for optical connectors
③
Status and error displays
④
Mode selector
⑤
Connector for power supply and functional ground
Validity of this manual
This manual contains information on the following products:
●
CP 342−5
Article number: 6GK7 342-5DA03-0XE0
Hardware product version: 2

Preface
CP 342-5 / CP 342-5 FO
4Manual, 07/2017, C79000-G8976-C146-10
Firmware version: V6.0.66
Communications processor for connection of SIMATIC S7-300 / to PROFIBUS DP
●
CP 342−5 FO
Article number: 6GK7 342-5DF00-0XE0
Hardware product version: 5
Firmware version: V5.7
Communications processor for connection of SIMATIC S7-300 / to PROFIBUS DP
Product name
●CP
In this document, the term "CP" is also used instead of the full product name of the two
modules.
Difference between the CP 342-5 and CP 342-5 FO
When the function being described only applies to one of the two device types CP 342-5 or
CP 342-5 FO, the text will point out which device the information applies to.
Structure of the documentation
The documentation for this device consists of the following parts:
●Manual Part A - Configuration manual "Configuring and Commissioning S7 CPs for
PROFIBUS"
You will find this manual on the Manual DVD that ships with every CP or on the Internet
at the following address:
Link: (https://support.industry.siemens.com/cs/ww/de/view/1158693)
●Part B - Manual "S7 CPs for PROFIBUS CP 342-5 / CP 342-5 FO" (this manual)
New in this issue
●New firmware version of the CP 342-5 (5DA03)
Improved response when loading firmware files, see section Loading firmware (Page 39).
●Editorial revision
Replaced documentation
This manual replaces the manual release 10/2011.
Current manual release on the Internet
You will also find the current version of this manual on the Internet pages of Siemens
Industry Online Support:
CP 342-5: (https://support.industry.siemens.com/cs/ww/en/ps/15674/man)
CP 342-5 FO: (https://support.industry.siemens.com/cs/ww/en/ps/15675/man)

Preface
CP 342-5 / CP 342-5 FO
Manual, 07/2017, C79000-G8976-C146-10 5
License conditions
Note
Open source software - CP 342-5 (6GK7 342−5DA03−0XE0)
Read the license conditions for open source software carefully before using the product. The
acceptance of the disclaimers of liability and warranty it contains is a clear precondition of
the use of open source software.
You will find license conditions in
the document "OSS_CP3425_86.pdf" on the data medium
supplied with the product documentation and on the Internet pages of Siemens Industry
Online Support.
FAQs on the Internet
You will find detailed information (FAQs) on using the PROFIBUS S7-CPs at the following
Internet address (entry type: FAQ):
Link: (https://support.industry.siemens.com/cs/ww/en/ps/15673/faq)
Security information
Siemens provides products and solutions with industrial security functions that support the
secure operation of plants, systems, machines and networks.
In order to protect plants, systems, machines and networks against cyber threats, it is
necessary to implement – and continuously maintain – a holistic, state-of-the-art industrial
security concept. Siemens’ products and solutions only form one element of such a concept.
Customer is responsible to prevent unauthorized access to its plants, systems, machines
and networks. Systems, machines and components should only be connected to the
enterprise network or the internet if and to the extent necessary and with appropriate security
measures (e.g. use of firewalls and network segmentation) in place.
Additionally, Siemens’ guidance on appropriate security measures should be taken into
account. For more information about industrial security, please visit
Link: (http://www.siemens.com/industrialsecurity)
Siemens’ products and solutions undergo continuous development to make them more
secure. Siemens strongly recommends to apply product updates as soon as available and to
always use the latest product versions. Use of product versions that are no longer supported,
and failure to apply latest updates may increase customer’s exposure to cyber threats.
To stay informed about product updates, subscribe to the Siemens Industrial Security RSS
Feed under
Link: (http://www.siemens.com/industrialsecurity).

Preface
CP 342-5 / CP 342-5 FO
6Manual, 07/2017, C79000-G8976-C146-10
Recycling and disposal
The product is low in pollutants, can be recycled and meets the requirements of the WEEE
directive 2012/19/EU "Waste Electrical and Electronic Equipment".
Do not dispose of the product at public disposal sites. For environmentally friendly recycling
and the disposal of your old device contact a certified disposal company for electronic scrap
or your Siemens contact.
Keep to the local regulations.
You will find information on returning the product on the Internet pages of Siemens Industry
Online Support:
Link: (https://support.industry.siemens.com/cs/ww/en/view/109479891)
SIMATIC NET glossary
Explanations of many of the specialist terms used in this documentation can be found in the
SIMATIC NET glossary.
You will find the SIMATIC NET glossary on the Internet at the following address:
Link: (https://support.industry.siemens.com/cs/ww/en/view/50305045)
Training, Service & Support
You will find information on Training, Service & Support in the multi--language document
"DC_support_99.pdf" on the data medium supplied with the documentation.

CP 342-5 / CP 342-5 FO
Manual, 07/2017, C79000-G8976-C146-10 7
Table of contents
Preface ................................................................................................................................................... 3
1 Application and functions ........................................................................................................................ 9
1.1 Application ................................................................................................................................9
1.2 Interfaces and connectors ........................................................................................................9
1.3 Communications services .......................................................................................................10
1.4 Performance data and behavior in operation .........................................................................11
1.4.1 Transmission speeds supported.............................................................................................11
1.4.2 Characteristic data of the DP interface / DP master...............................................................11
1.4.3 Characteristic data of the DP interface / DP slave .................................................................13
1.4.4 Characteristic data of open communications services (SEND/RECEIVE interface) over
FDL connections .....................................................................................................................15
1.4.5 Characteristics of S7 communication .....................................................................................16
1.4.6 Characteristic data for multiplexing OP connections ..............................................................17
1.4.7 Parallel use of communications services (multiprotocol mode)..............................................18
1.5 Requirements for use..............................................................................................................19
1.5.1 Operation in control device families........................................................................................19
1.5.2 Project engineering .................................................................................................................20
1.5.3 Programming ..........................................................................................................................21
1.6 Compatibility with the previous product ..................................................................................21
1.6.1 Enhanced functions and modifications ...................................................................................21
1.6.2 Replacing older modules / module replacement ....................................................................23
1.6.3 Compatibility in the user program in DP mode .......................................................................24
2 LEDs and mode selector ....................................................................................................................... 29
2.1 LED displays ...........................................................................................................................29
2.2 Mode selector .........................................................................................................................31
3 Installation, connecting up, commissioning............................................................................................ 33
3.1 Important notes on using the device.......................................................................................33
3.1.1 Notes on use in hazardous areas ...........................................................................................33
3.1.2 Notes on use in hazardous areas according to ATEX / IECEx ..............................................34
3.1.3 Notes on use in hazardous areas according to UL HazLoc ...................................................35
3.2 Procedure for installation and commissioning ........................................................................35
4 Notes on operation................................................................................................................................ 37
4.1 Loading with modified transmission speed.............................................................................37
4.2 DP mode .................................................................................................................................37
4.3 Interface in the user program (status of blocks) .....................................................................38
5 Diagnostics and upkeep ........................................................................................................................ 39
5.1 Loading firmware ....................................................................................................................39

Table of contents
CP 342-5 / CP 342-5 FO
8Manual, 07/2017, C79000-G8976-C146-10
6 Technical specifications ........................................................................................................................ 41
A Certifications and approvals .................................................................................................................. 43
B References ........................................................................................................................................... 47
B.1 On configuring and using the CP ........................................................................................... 47
B.2 On installing and commissioning the CP ............................................................................... 48
B.3 On programming .................................................................................................................... 48
Index .................................................................................................................................................... 49

CP 342-5 / CP 342-5 FO
Manual, 07/2017, C79000-G8976-C146-10 9
Application and functions
1
1.1
Application
Automation system
The CP 342-5/342-5 FO communications processor is intended for operation in a SIMATIC
S7-300 / C7-300 automation system. It allows connection of the S7-300 / C7-300 to a
PROFIBUS fieldbus system.
1.2
Interfaces and connectors
The connectors are located behind the cover of the housing of the CP.
Connection to PROFIBUS
●
CP 342-5
The interface is a 9-pin D-sub female connector operating according to the RS-485
standard.
●
CP 342-5 FO
The two optical connectors are designed as duplex sockets.
For information on the connection see section Procedure for installation and commissioning
(Page 35).
Connection to power supply
A 4-pin terminal is available for the 24 VDC power supply,
For information on the connection see section Procedure for installation and commissioning
(Page 35).

Application and functions
1.3 Communications services
CP 342-5 / CP 342-5 FO
10 Manual, 07/2017, C79000-G8976-C146-10
1.3
Communications services
Supported communications services
The current version of the CP 342-5/342-5 FO supports the following communications
services:
●
PROFIBUS DP
–as DP master class 1 (PROFIBUS DP according to EN 50170 DPV0, DP master)
–as DP slave (PROFIBUS DP according to EN 50170 DPV0, DP slave)
Note
DP master or DP slave
Please note, however: The CP 342
-5/342-5 FO supports operation as a DP master or
DP slave only as alter
natives. You can also deselect DP mode altogether.
●
S7 communication and PG/OP communication
–PG functions with uploading / downloading of FM modules, configuration / diagnostics
and routing
–Operator control and monitoring functions (HMI)
Multiplexing TD/OP connections
When multiplexing OP connections, the following acyclic services are supported:
- read once
- write once
- read system status list
–Client and server for data exchange via communication blocks on S7 connections
configured at both ends
The following blocks / functions are available:
BSEND FB 12, BRCV FB 13,
PUT FB 14, GET FB 15
USEND FB 8, URCV FB 9
C_CNTRL FC 62
You will find a more detailed description in /5/ (Page 48)
Note
The partner station can be an S7
-300, S7-400 or PG/PC application with SIMATIC
NET OPC server; raw data tags using BSEND/BRECV to WinCC are not supported.
–Server for data exchange on connections configured at both ends without
communications blocks on the S7-300 / C7-300 station
●
Open communications services (SEND/RECEIVE interface) over FDL connections of the
following type:
–Specified FDL connections

Application and functions
1.4 Performance data and behavior in operation
CP 342-5 / CP 342-5 FO
Manual, 07/2017, C79000-G8976-C146-10 11
–Free layer 2 connections (SDA, SDN)
–Broadcast
–Multicast
The services of the CP 342-5/342-5 FO listed here can be used independently at the
same time.
1.4
Performance data and behavior in operation
1.4.1
Transmission speeds supported
The transmission speed is set with the SIMATIC STEP 7 configuration software. For
permitted values, refer to Table 6-1 CP 342-5 (Page 41) and Table 6-2 CP 342-5 FO
(Page 41)
Note
Remember the cable length
The permitted cable length must be kept to depending on the transmission speed. Refer to
the information in
/3/ (Page 48)
1.4.2
Characteristic data of the DP interface / DP master
General characteristic data
When operating the CP 342-5/342-5 FO as a DP master, the following characteristic data is
significant:
Characteristic
Explanation / values
Number of operable DP slaves
124 max.
Total number of operable slots
1024 max.
Size of the DP data areas (total):
•DP input area
•DP output area
2160 bytes max.
2160 bytes max.
Size of the DP data areas (per DP slave):
•DP input area
•DP output area
244 bytes max.
244 bytes max.
Size of the DP diagnostics data:
240 bytes per DP slave
PROFIBUS address range for DP master mode
1 - 125

Application and functions
1.4 Performance data and behavior in operation
CP 342-5 / CP 342-5 FO
12 Manual, 07/2017, C79000-G8976-C146-10
Note
Optimum token passing
You can achieve optimum token passing by taking the following measures:
•
Assign the lower PROFIBUS addresses to the active nodes.
•
In the "Highest PROFIBUS address" input box, enter the highest PROFIBUS address of
an active node.
Note
Possible lack of resources with extensive configuration and parameter assignment data
The maximum number of connectable DP slaves as shown in the table can be reduced if the
DP slaves require extensive configuration and parameter assignment data.
In this case, the configuration memory on the CP is not adequate. You will
receive a
message in the diagnostics buffer of the CP indicating a lack of resources when you load the
configuration data.
Enhanced DP master functions
As DP master, the CP 342-5/342-5 FO supports the following:
●SYNC/FREEZE (acyclic)
●Shared input/output (acyclic)
●Enable / disable DP slaves
●Settings that can be changed at run time:
–own PROFIBUS address
–DP operating mode (no DP, DP master, DP slave active/passive)
●Hardware interrupts / diagnostics interrupts
Hardware and diagnostics interrupts do not need to be evaluated in the user program.
Hardware and diagnostics interrupts are acknowledged automatically by the CP.
You can use single diagnostics to obtain interrupt information.

Application and functions
1.4 Performance data and behavior in operation
CP 342-5 / CP 342-5 FO
Manual, 07/2017, C79000-G8976-C146-10 13
Execution times of the program blocks for PROFIBUS DP
The following table will help you to calculate the CPU cycle times (OB1) in DP master mode.
The table contains the execution time of the program blocks (DP_SEND, DP_RECV)
required for DP processing on the S7-300 / C7-300 CPU.
Component
Explanation / guideline values
Execution time on the CPU
314C-2DP (6ES7 314-6CF00-
0AB0)
Per DP_Send block call:
•<3.0 ms at 8 bytes
•<5.0 ms at 2160 bytes 1)
Per DP_RECV block call:
•<3.3 ms at 8 bytes
•<5.8 ms at 2160 bytes 1)
Execution time on the CPU 317-
2PN/DP (6ES7 317-2EJ10-
0AB0)
Per DP_SEND block call:
•<1.5 ms at 8 bytes
•<2.3 ms at 2160 bytes 1)
Per DP_RECV block call:
•<1.7 ms at 8 bytes
•<2.8 ms at 2160 bytes 1)
1)
the following applies at data lengths > 240 bytes: The data is transferred segmented over several
block calls.
Note
Time values are guidelines
The times shown for DP master mode should only be considered as guideline values. The
values apply only for a mono master configuration when no other services (for example PG
functions) are processed on the CP.
Note
DP master mode and S7 slaves (ET-200)
You will find important information on using and configuring (importing the GSD file) S7
slaves (ET200) when operating the CP as DP master on the Internet under the followin
g
entry ID:
Link: (
https://support.industry.siemens.com/cs/ww/en/view/21628502)
1.4.3
Characteristic data of the DP interface / DP slave
General characteristic data
The following characteristic data is important for successful data transfer from the DP master
to the DP slave:
Characteristic
Explanation / values
Generic station de-
scription (GSD)
Depending on the CP type, use the following GSD files:
CP 342-5 (6GK7 342-5DA02-0XE0)
SIEM80D6.GSD
CP 342-5 (6GK7 342-5DA03-0XE0)
SI0180D6.GSD
CP 342-5 FO(6GK7 342-5DF00-0XE0)
SIEM80D7.GSD

Application and functions
1.4 Performance data and behavior in operation
CP 342-5 / CP 342-5 FO
14 Manual, 07/2017, C79000-G8976-C146-10
Characteristic
Explanation / values
You will find GSD files on the Internet at the following address:
Link: (https://support.industry.siemens.com/cs/ww/en/view/113652)
Size of the DP data
areas
DP input area
240 bytes max.
DP output area 240 bytes max.
Min. slave interval
0.6 ms
SYNC / FREEZE
CP 342-5 (6GK7 342-5DA03-0XE0)
Is supported
CP 342-5 FO (6GK7 342-5DF00-0XE0)
The following is not supported
User parameter assignment data
3 bytes; value: 40 00 00 (fixed)
User diagnostics data
0 bytes
Note
Fail-safe
Fail
-safe mode is possible only if you use the GSD files listed in the table above.
Execution times of the program blocks for PROFIBUS DP
The following table will help you to calculate the CPU cycle times (OB1) in DP slave mode.
The table contains the execution time of the FCs (FC DP_SEND, FC DP_RECV) required for
DP processing on the S7-300 / C7-300 CPU.
Component
Explanation / values
Execution time on the CPU
314C-2DP (6ES7 314-6CF00-
0AB0)
Per DP_SEND block call:
•<3.0 ms at 8 bytes
•<5.0 ms at 240 bytes
Per DP_RECV block call:
•<3.3 ms at 8 bytes
•<5.8 ms at 240 bytes
Execution time on the CPU 317-
2PN/DP (6ES7 317-2EJ10-
0AB0)
Per DP_SEND block call:
•<1.5 ms at 8 bytes
•<2.3 ms at 240 bytes
Per DP_RECV block call:
•<1.7 ms at 8 bytes
•<2.8 ms at 240 bytes
Note
Time values are guidelines
The times shown for DP slave mode should only be considered as guideline values. The
values apply only when no other services (for example PG functions) are processed on the
CP.

Application and functions
1.4 Performance data and behavior in operation
CP 342-5 / CP 342-5 FO
Manual, 07/2017, C79000-G8976-C146-10 15
1.4.4
Characteristic data of open communications services (SEND/RECEIVE
interface) over FDL connections
General characteristic data
The characteristic data is important when operating FDL connections (specified, free layer 2
(SDA and SDN), broadcast, multicast):
Characteristic
Explanation / values
Total number of FDL connections that can be
operated.
16 max.
Size of the transferable data area on FDL con-
nections.
1-240 bytes maximum per specified FDL connec-
tion (for sending and receiving):
Free Layer 2, broadcast and multicast:
Up to 236 bytes of user data can be transferred
per job. The job header occupies an additional 4
bytes.
Execution times of the program blocks AG_SEND / AG_RECV
The following table will help you to calculate the CPU cycle times (OB1) for FDL
connections. The table contains the execution time of the FCs (FC AG_SEND, FC
AG_RECV) required for DP processing on the S7-300 / C7-300 CPU.
Component
Explanation / values
Execution time on the CPU
314C-2DP (6ES7 314-6CF00-
0AB0)
Per AG_SEND block call:
•<5.1 ms at <=240 bytes
Per AG_RECV block call:
•<5.7 ms at <=240 bytes
Execution time on the CPU 317-
2PN/DP (6ES7 317-2EJ10-
0AB0)
Per AG_SEND block call:
•<2.4 ms at <=240 bytes
Per AG_RECV block call:
•<2.8 ms at <=240 bytes
Time response on FDL connections
Refer to the following table for transmission rates with FDL connections dependent on the
following parameters:
●Frame length (number of bytes)
●CPU type
The values were measured while sending or receiving successively (at a transmission rate of
1.5 Mbps; bus profile standard; 9 nodes).
Table 1- 1 Number of FDL frames per second for CPU 317
Frame length
Number of FDL frames per second
8 bytes
140 / s
128 bytes
138 / s
240 bytes
135 / s

Application and functions
1.4 Performance data and behavior in operation
CP 342-5 / CP 342-5 FO
16 Manual, 07/2017, C79000-G8976-C146-10
1.4.5
Characteristics of S7 communication
General characteristic data
The following information is important when operating S7 connections:
Characteristic
Explanation / values
Number of operable S7 connections 16 maximum
S7 connections configured at one end / both
ends; including PG and TD/OP connections
Dependencies and restrictions relating to the number of S7 connections
Depending on the configuration and modes, remember the following:
●The actual possible number of S7 connections that can be operated depends on the type
of CPU being used. Further restrictions result from multiprotocol mode; note the
information in the section Parallel use of communications services (multiprotocol mode)
(Page 18)
●If the CP is configured as a DP slave, the following restrictions apply:
–S7 connections cannot be operated;
–OP multiplex mode is not possible.
Execution times for program blocks for S7 connections
The following table will help you to calculate the CPU cycle times (OB1) for S7 connections.
The table contains the execution time of the program blocks (PUT, GET, USEND, URCV,
BSEND, BRCV) required for DP processing on the S7-300 / C7-300 CPU.
Execution time on the CPU per block call
Block type
PUT
GET
USEND
URCV
BSEND
BRCV
Data length
<=160 bytes
<=16 K bytes
CPU 314C-2DP
(6ES7 314-
6CF00-0AB0)
<5.6 ms <5.8 ms <6.0 ms <5.6 ms <5.7 ms <5.8 ms
CPU 317-
2PN/DP (6ES7
317-2EJ10-
0AB0)
<2.1 ms <2.5 ms <2.0 ms <2.4 ms <2.1 ms <2.7 ms

Application and functions
1.4 Performance data and behavior in operation
CP 342-5 / CP 342-5 FO
Manual, 07/2017, C79000-G8976-C146-10 17
Time response on S7 connections
Refer to the following table for transmission rates with S7 connections dependent on the
following parameters:
●Frame length (number of bytes)
●Job type
●CPU type
The values were measured while sending or receiving successively (at a transmission rate of
1.5 Mbps; bus profile standard; 9 nodes).
Table 1- 2 Number of S7 frames per second for CPU 317
Request type
Frame length
Number of S7 frames per sec-
ond
PUT
<=160 bytes
29 / s
GET <=160 bytes 26 / s
USEND/URCV
<=160 bytes
35 / s
BSEND/BRCV
<=160 bytes
25 / s
<=400 bytes
14 / s
<=800 bytes
8 / s
1.4.6
Characteristic data for multiplexing OP connections
General characteristic data
The following information is important when operating HMI (TD/OP) connections:
Characteristic
Explanation / values
Number of operable HMI connections
16 max.
When multiplexing OP connections, the following acyclic services are supported:
●read once
●write once
●read system status list
If cyclic services or ProAgent interfacing (ALARM_S message block) are required, please
continue to use the rack/slot addressing of the remote S7-300 CPU.
Note
PG connections and connections to WinCC
PG connections and connections to WinCC are not operated over the multiplexer. When
operating a PG, a connection resource is always occupied.

Application and functions
1.4 Performance data and behavior in operation
CP 342-5 / CP 342-5 FO
18 Manual, 07/2017, C79000-G8976-C146-10
1.4.7
Parallel use of communications services (multiprotocol mode)
Speed
Using the various available communications services at the same time affects the
communication speed.
Note
Recommendation for multiprotocol mode
In multiprotocol mode
- DP + FDL + S7 functions / TD/OP connections - you should select a
delay time of 2
-5 ms.
Overall operational limits
When using communications connections/services at the same time, it is not possible to
achieve the maximum values as when using the communications connections/services
alone.
Note the following limits:
Characteristic
Explanation / values
Number of operable connections in total:
•in operation with PROFIBUS DP
(DP master with up to 15 DP slave 1))
44 maximum
Of these, up to 16 FDL connections and 12 S7
connections and 16 OP connections in multiplex
mode.
•in operation without PROFIBUS DP 48 maximum
1) The number of S7 connections that can be operated when using the module as DP master
depends
on the number and configuration of the assigned DP slaves (see table below).
Influence of the data length in S7 communication
In S7 communication, the data length of the jobs and in DP mode, the number of DP slaves
and the length of the I/O data mean the following restrictions:
●Number of S7 connections
●Number of jobs that can be sent at one time
The decisive factor is the job with the highest data length.

Application and functions
1.5 Requirements for use
CP 342-5 / CP 342-5 FO
Manual, 07/2017, C79000-G8976-C146-10 19
The information in the following table applies to S7 job types BSEND/BRCV, PUT/GET, and
USEND/URCV.
Data length in bytes 1)
Number of S7 connections or number of S7 jobs
S7 communication only
With DP master and 32
DP slaves ET200B
(1 byte I data and 1
byte Q data)
With DP master and 32
DP slaves ET200M
(32 byte I data and 32
byte Q data)
<=1000
16
10
8
2000
16
8
6
4000 16 6 5
8000
8
4
4
16000
4
2
2
32000
2
1
1
1) A maximum of 32 Kbytes can be transmitted with one BSEND/BRCV block, with
PUT/GET/USEND/URCV a maximum of 160 bytes in each case.
1.5
Requirements for use
1.5.1
Operation in control device families
SIMATIC device families
You can operate the CP in the following device families:
●SIMATIC S7-300 stations with the following CPU types:
–Standard
–Compact
–Modular
●SIMATIC C7 compact units in C7 packaging system
●SINUMERIK

Application and functions
1.5 Requirements for use
CP 342-5 / CP 342-5 FO
20 Manual, 07/2017, C79000-G8976-C146-10
1.5.2
Project engineering
Configuration and downloading the configuration data
It is possible to download the configuration data to the CP via MPI or PROFIBUS. The
following version of STEP 7 is required:
STEP 7 version
Functions of the CP
STEP 7 as of V5.1 The functional range of the following CP type can
be configured:
•6GK7 342-5DA02-0XE0
•6GK7 342-5DF00-0XE0
•STEP 7 as of V5.4.5 with Hotfix 4 and HSP
1049
•STEP 7 as of V5.5.2
•STEP 7 Professional V11 or higher
The functional range of the following CP type can
be configured:
•6GK7 342-5DA03-0XE0
Depending on what is available on your PG / PC and the S7
-300 station, use one of the following
connectors to load the configuration data: MPI, Industrial Ethernet or PROFIBUS.
Note
Changing bus parameters
If you change
the bus parameters in the configuration data, you must not load this
configuration data on the CP via PROFIBUS!
Note
Extensive configuration
Before loading an extensive configuration over a previous configuration, you should run a
memory reset on the CP.
By doing this, you avoid the configuration storage space on the CP being exceeded. If the
configuration storage space on the CP is not adequat
e, the diagnostics buffer of the CP
reports a lack of resources when you download the configuration data.
Replacing a module without a programming device
The CP supports the option of storing the configuration data of the CP on the CPU. If you
use this option, this means that module replacement is possible without having to load the
configuration data from the PG again.
The configuration data is then stored in load memory of the CPU. Storage of the
configuration data is protected from power failure by the battery backup or the EPROM
module card in the CPU.