Siemens CM 1243-5 User manual

CM 1243- 
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SIMATIC NET
CM 1243-5
Operating Instructions
04/2011
C79000-G8976-C246-01
Preface
Application and properties
1
Displays and connectors
2
Installing, connecting up and
commissioning
3
Configuration and
programming
4
Operating the module
5
Technical specifications
6
Dimension drawings
A
Approvals
B
References
C
Training, Service & Support
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-C246
Ⓟ 04/2011
Copyright © Siemens AG 2011.
Technical data subject to change

CM 1243-5
Operating Instructions, 04/2011, C79000-G8976-C246-01 3
Preface
Validity of this manual
This document contains information on the following product:
CM 1243-5
Order number 6GK7 243-5DX30-0XE0
Hardware product version 1, firmware version V1.0
The device is the communications module for the PROFIBUS DP master function for the
SIMATIC S7-1200.
Figure 1-1 CM 1243-5
At the top right behind the hinged cover of the module housing, you will see the hardware
product version printed as a placeholder "X" (for example X 2 3 4). In this case, "X" would be
the placeholder for hardware product version 1.
Product name
In this document, the term "CM" is also used instead of the full product name "CM 1243-5".
Purpose of the manual
This manual describes the properties of this module and supports you when installing and
commissioning the device.

Preface
CM 1243-5
4 Operating Instructions, 04/2011, C79000-G8976-C246-01
The necessary configuration steps are described in the form of an overview.
You will also find instructions for operation and maintenance and information on the
diagnostics options of the device.
Required experience
To install, commission and operate the CM, you require experience in the following areas:
● Automation engineering
● Setting up the SIMATIC S7-1200
● SIMATIC STEP 7
● Data transfer with PROFIBUS
Further information
You will find an overview of further reading and references in the Appendix of this manual.
You will also find information about training, Service & Support and who to contact in the
Appendix of this manual.
License conditions
NOTICE
Open source software
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 the license conditions on the data medium with the product documentation.

CM 1243-5
Operating Instructions, 04/2011, C79000-G8976-C246-01 5
Table of contents
Preface ...................................................................................................................................................... 3
1 Application and properties ......................................................................................................................... 7
1.1 Connecting the S7-1200 to PROFIBUS.........................................................................................7
1.2 Communications services of the CM .............................................................................................7
1.3 Performance data ..........................................................................................................................8
1.4 Requirements for operation ...........................................................................................................9
1.5 Configuration examples for PROFIBUS ......................................................................................10
2 Displays and connectors.......................................................................................................................... 11
2.1 Opening the covers of the housing ..............................................................................................11
2.2 LEDs ............................................................................................................................................12
2.3 Electrical connections ..................................................................................................................15
3 Installing, connecting up and commissioning........................................................................................... 17
3.1 Warning overvoltage protection ...................................................................................................19
3.2 Installing and commissioning the CM 1243-5..............................................................................19
3.3 Pin assignment of the socket for the external power supply .......................................................22
3.4 Pinout of the D-sub socket...........................................................................................................23
4 Configuration and programming .............................................................................................................. 25
4.1 Configuration................................................................................................................................25
4.2 Programming................................................................................................................................26
5 Operating the module .............................................................................................................................. 27
5.1 Note on operation ........................................................................................................................27
5.2 Diagnostics...................................................................................................................................27
5.3 Downloading firmware .................................................................................................................28
5.4 Module replacement ....................................................................................................................28
6 Technical specifications........................................................................................................................... 29
A Dimension drawings ................................................................................................................................ 31
B Approvals................................................................................................................................................. 33
C References .............................................................................................................................................. 39
D Training, Service & Support..................................................................................................................... 41
Glossary .................................................................................................................................................. 43
Index........................................................................................................................................................ 47

Table of contents
CM 1243-5
6 Operating Instructions, 04/2011, C79000-G8976-C246-01

CM 1243-5
Operating Instructions, 04/2011, C79000-G8976-C246-01 7
Application and properties 1
1.1 Connecting the S7-1200 to PROFIBUS
Connecting the S7-1200 to PROFIBUS DP
The S7-1200 can be connected to a PROFIBUS fieldbus system with the following
communications modules:
● CM 1242-5
Operates as DP slave
● CM 1243-5
Operates as DP master class 1
If a CM 1242-5 and a CM 1243-5 are installed together, an S7-1200 can perform the
following tasks simultaneously:
● Slave of a higher-level DP master system
and
● Master of a lower-level DP master system
1.2 Communications services of the CM
Bus protocol
The PROFIBUS CMs use the PROFIBUS DP-V1 protocol.
Possible DP slaves for the DP master CM 1243-5
With the DP master module CM 1243-5, the S7-1200 can communicate with the following
DP-V0/V1 slaves:
● Distributed I/O SIMATIC ET200
● S7-1200 CPUs with CM 1242-5
● S7-200 CPUs with PROFIBUS DP module EM 277
● SINAMICS converter
● Drives and actuators from various vendors
● Sensors of various vendors
● S7-300/400 CPU with PROFIBUS interface

Application and properties
1.3 Performance data
CM 1243-5
8 Operating Instructions, 04/2011, C79000-G8976-C246-01
● S7-300/400 with PROFIBUS CP (for example CP 342-5)
● SIMATIC PC stations with PROFIBUS CP
Types of communication with the CM 1243-5 in DP-V1
The following types of communication are available with DP-V1:
● Cyclic communication
The CM supports cyclic communication for the transfer of process data between DP slave
and DP master.
Cyclic communication is handled by the operating system of the CPU. No instructions or
software blocks are required for this. The I/O data is read or written directly from/to the
process image of the CPU.
● Acyclic communication
The CM also supports acyclic communication:
– The "RALRM" instruction is available for receiving interrupts of the DP slaves.
– The "RDREC" and "WRREC" instructions are available for transferring configuration,
diagnostics or I/O data.
The SYNC/FREEZE and Get_Master_Diag functions are not supported.
Other communications services of the CM 1243-5
The CM 1243-5 supports the following additional communications services:
● S7 communication
– PUT/GET services
The DP master functions as a client and server for queries from other S7 controllers or
PCs via PROFIBUS.
– PG/OP communication
The PG functions allow the downloading of configuration data and user programs from
a PG and the transfer of diagnostics data to a PG.
Possible communications partners for OP communication are HMI panels, SIMATIC
panel PCs with WinCC flexible or SCADA systems that support S7 communication.
1.3 Performance data
Transmission speeds of the CM 1243-5
As the transmission speed on PROFIBUS, values of 9.6 kbps to 12 Mbps are permitted for
the CM.

Application and properties
1.4 Requirements for operation
CM 1243-5
Operating Instructions, 04/2011, C79000-G8976-C246-01 9
Characteristic data of the DP interface of the CM 1243-5
● Number of DP slaves operable with a DP master: Maximum 16 *)
● Total number of operable slots: Maximum 256
Any distribution of the slots as I slots and Q slots is permitted.
● Size of the DP data areas of the DP master: Max. 1024 bytes
– Input area of the DP master in total: Max. 512 bytes
– Output area of the DP master in total: Max. 512 bytes
● Maximum size of the DP data areas of the DP slaves
– Input area per DP slave: Max. 244 bytes
– Output area per DP slave: Max. 244 bytes
– Diagnostics data area per DP slave: Max. 244 bytes
NOTICE
*) Maximum 16 DP slaves per station
For the constellation STEP 7 V11.0 and CPU firmware V2.0, resources are available
for a maximum 16 DP slaves in total per station.
If you plug in a master module (CM 1243-5) and 1 or 2 slave modules (CM 1242-5) in
a station at the same time, the maximum number of slaves that can be operated with
the CM 1243-5 reduces by the CM 1242-5 modules plugged into the same station.
The number of DP slaves that can be operated with the DP master is therefore
reduced to 15 or 14.
Characteristic data of S7 communication
● Number of possible connections for S7 communication in total: 8
Of which maximum:
– Configured connections for PUT/GET services: 4
– PG connections: 1
– OP connections: 3
● User data per frame
– PUT: Max. 209 bytes
– GET: Max. 222 bytes
1.4 Requirements for operation
Configuration tool
To configure the module, the following configuration tool is required:

Application and properties
1.5 Configuration examples for PROFIBUS
CM 1243-5
10 Operating Instructions, 04/2011, C79000-G8976-C246-01
STEP 7 as of version V11.0
CPUs of the S7-1200
Use of PROFIBUS functionalities with the S7-1200 is only possible with CPUs as of firmware
version 2.0.
1.5 Configuration examples for PROFIBUS
Below, you will find examples of configurations in which the CM 1242-5 is used as a DP
slave and the CM 1243-5 is used as a DP master.
Operator
control &
Operator control &
monitoring
SIMATIC S7-1200
with CM 1242-5
SIMATIC S7-1200
with CM 1242-5
PROFIBUS
PROFINET/
Industrial Ethernet
PROFIBUS
(LWL)
SIMATIC S7-300
PG/PC/IPC
OLMOLM
Figure 1-1 Configuration example with a CM 1242-5 as PROFIBUS slave
Operator control &
monitoring
SIMATIC S7-1200
with CM 1243-5
PROFIBUS
PG/PC/IPC SINAMICS ET 200S
Figure 1-2 Configuration example with a CM 1243-5 as PROFIBUS master

CM 1243-5
Operating Instructions, 04/2011, C79000-G8976-C246-01 11
Displays and connectors 2
2.1 Opening the covers of the housing
Location of the display elements and the electrical connectors
The LEDs for the detailed display of the module statuses are located behind the upper cover
of the module housing.
The terminals for the power supply are located on the top of the module.
The PROFIBUS connector is located behind the lower cover of the module.
Opening the covers of the housing
Open the upper or lower cover of the housing by pulling it down or up as shown in the
illustration. The covers extend beyond the housing to give you a grip.
Figure 2-1 Opening the covers of the housing

Displays and connectors
2.2 LEDs
CM 1243-5
12 Operating Instructions, 04/2011, C79000-G8976-C246-01
2.2 LEDs
LEDs of the module
The module has various LEDs for displaying the status:
● LED on the front panel
The "DIAG" LED that is always visible shows the basic statuses of the module.
Table 2- 1 LED on the front panel
LED / colors Name Meaning
red / green
DIAG Display of the basic status of the module
● LEDs below the upper cover of the housing
Open the upper housing cover. The LEDs here provide more detailed information on the
module status.
Table 2- 2 LEDs below the upper cover of the housing
LED / colors Name Meaning
yellow / green
RUN/STOP Details on the operational and communications status of the
module
red
ERROR Group error
- not used - -
- not used - -
NOTICE
LED colors when the module starts up
When the module starts up, all its LEDs are lit for a short time. Multicolored LEDs display a
color mixture. At this point in time, the color of the LEDs is not clear.

Displays and connectors
2.2 LEDs
CM 1243-5
Operating Instructions, 04/2011, C79000-G8976-C246-01 13
Display of the operating and communication status
The LED symbols in the following tables have the following significance:
Table 2- 3 Meaning of the LED symbols
Symbol -
LED status OFF ON (steady light) Flashing, one color Flashing
yellow-green
Not relevant
The LEDs indicate the operating and communications status of the module according to the
following scheme:
Table 2- 4 Display of the basic states of the module by the "DIAG" LED
DIAG
(red / green)
Meaning Comment
Power OFF
green
RUN without errors
flashing green
Startup
STOP without errors
No project data
Firmware update
The individual states are signaled by the
RUN/STOP and ERROR LEDs (see below).
flashing red
Problem / error The individual states are signaled by the
RUN/STOP and ERROR LEDs (see below).

Displays and connectors
2.2 LEDs
CM 1243-5
14 Operating Instructions, 04/2011, C79000-G8976-C246-01
Table 2- 5 Display schemes for detailed module statuses
DIAG
(red / green)
- RUN/STOP
(yellow /
green)
ERROR
(red)
Meaning
Detailed status schemes
green
RUN without errors,
Exchange of user data with DP master
flashing green
Stopped (STOP) without errors
No project data available
flashing green
Starting up (STOP → RUN)
flashing green
Loading firmware
(The RUN/STOP and ERROR LEDs flash
alternately.)
flashing red
RUN with PROFIBUS problem:
DP slave errors
No master-slave connection
PROFIBUS cable not connected or not
detected
flashing red
System fault:
CM has not received an address from the CPU
Power supply of the CM was interrupted
CPU reset to factory defaults
Solution when the error is permanent: Station
power → OFF → ON
Other possible problems:
Module fault
Incomplete firmware version
Contact the hotline.
In STOP mode, configuring and performing diagnostics on the CM remain possible.

Displays and connectors
2.3 Electrical connections
CM 1243-5
Operating Instructions, 04/2011, C79000-G8976-C246-01 15
2.3 Electrical connections
Power supply
The 3-pin socket for the external 24 V DC power supply is located on the top of the module.
The matching plug ships with the product.
You will find the pin assignment of the socket in section Pin assignment of the socket for the
external power supply (Page 22).
6RFNHWIRU9'&
SRZHUVXSSO\
Figure 2-2 Socket for the 24 V DC power supply
9-pin D-sub female connector (PROFIBUS)
The PROFIBUS connector is located behind the lower cover of the module. The interface is
a 9-pin D-sub female connector operating according to the RS-485 standard.
You also have the option of connecting to optical PROFIBUS networks via an Optical Bus
Terminal OBT or an Optical Link Module OLM.
You will find the pin assignment of the D-sub socket in section Pinout of the D-sub socket
(Page 23).
More detailed information on the electrical connections
For technical information on the electrical connections, refer to the section Technical
specifications (Page 29).

Displays and connectors
2.3 Electrical connections
CM 1243-5
16 Operating Instructions, 04/2011, C79000-G8976-C246-01

CM 1243-5
Operating Instructions, 04/2011, C79000-G8976-C246-01 17
Installing, connecting up and commissioning 3
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 does not apply to 100 V...240 V devices.)
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.

Installing, connecting up and commissioning
CM 1243-5
18 Operating Instructions, 04/2011, C79000-G8976-C246-01
WARNING
Replacing components
EXPLOSION HAZARD
SUBSTITUTION OF COMPONENTS MAY IMPAIR SUITABILITY FOR CLASS I, DIVISION
2 OR ZONE 2.
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.
General notices on use in hazardous areas according to ATEX
WARNING
Requirements for the cabinet/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.

Installing, connecting up and commissioning
3.1 Warning overvoltage protection
CM 1243-5
Operating Instructions, 04/2011, C79000-G8976-C246-01 19
3.1 Warning overvoltage protection
CAUTION
Protection of the external 24 VDC power supply
If power is supplied to the module over longer 24 V power cables or networks, the coupling
in of strong electromagnetic pulses onto the power supply cables is possible. This can be
caused, for example by lightning strikes or switching of higher loads.
The connector of the external 24 VDC power supply is not protected from strong
electromagnetic pulses. To protect it, an external overvoltage protection module is
necessary. A suitable device is, for example, the Dehn Blitzductor BVT AD 24V type no.
918 402 or comparable protective element.
Manufacturer:
DEHN + SÖHNE GmbH + Co. KG, Hans-Dehn-Str. 1, PO box 1640, D-92306 Neumarkt
3.2 Installing and commissioning the CM 1243-5
Prior to installation and commissioning
WARNING
Read the system manual "S7-1200 Programmable Controller"
Prior to installation, connecting up and commissioning, read the relevant sections in the
system manual "S7-1200 Programmable Controller" (refer to the documentation in the
Appendix).
When installing and connecting up, keep to the procedures described in the system manual
"S7-1200 Programmable Controller".
Make sure that the power supply is turned off when installing/uninstalling the devices.
Configuration
One requirement for the commissioning of the CP is the completeness of the STEP 7 project
data. You should also read the section "Configuration and programming (Page 25)".

Installing, connecting up and commissioning
3.2 Installing and commissioning the CM 1243-5
CM 1243-5
20 Operating Instructions, 04/2011, C79000-G8976-C246-01
Dimensions for installation
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Figure 3-1 Dimensions for installation of the S7-1200
Table 3- 1 Dimensions for installation
S7-1200 devices Width A Width B *
CPU 1211C, CPU 1212C 90 mm 45 mm CPU
CPU 1214C 110 mm 55 mm
8 or 16 digital I/Os
2, 4 or 8 analog I/Os
Thermocouple, 4 or 8 I/Os
RTD, 4 I/Os
45 mm 22.5 mm Signal modules
16 analog I/Os
RTD, 8 I/Os
70 mm 35 mm
CM 1241 RS-232 and CM 1241 RS-485 30 mm 15 mm
CM 1243-5 (PROFIBUS master)
CM 1242-5 (PROFIBUS slave)
30 mm 15 mm
Communications
interfaces
CP 1242-7 (GPRS CP) 30 mm 15 mm
* Width B: The distance between the edge of the housing and the center of the hole in the DIN rail mounting clip
DIN rail mounting clips
All CPUs, SMs, CMs and CPs can be installed on the DIN rail in the cabinet. Use the pull-out
DIN rail mounting clips to secure the device to the rail. These mounting clips also lock into
place when they are extended to allow the device to be installed in a switching panel. The
inner dimension of the hole for the DIN rail mounting clips is 4.3 mm.