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© Siemens AG 2010SIMATIC S7-1200CommunicationCM 1241 communication module■ Overview• For quick, high-performance serial data exchange via pointto-pointconnection• Implemented protocols: ASCII, USS drive protocol, ModbusRTU• Additional protocols can also be loaded• Simple parameterization with STEP 7 Basic■ FunctionThe following standard protocols are available on the CM 1241communication modules:• ASCII:For interfacing to third-party systems with simple transmissionprotocols, e.g. protocols with start and end characters or withblock check characters. The interface handshake signals canbe called and controlled via the user program.•MODBUS:For communication according to the MODBUS protocol withRTU format:-MODBUS master:Master-slave interfacing with SIMATIC S7 as master.- MODBUS slave:Master-slave interfacing with SIMATIC S7 as slave; messageframe traffic from slave to slave not possible.• USS drive protocol:Instructions for connection of USS protocol drives are especiallysupported. In this case, drives exchange data overRS485. It is then possible to control these drives, and to readand write parameters.Further drivers for downloading are also available.ParameterizationParameterization of the CM 1241 communication module is particularlyuser-friendly and simple with STEP 7 Basic:• The user assigns the module characteristics via a parameterizationenvironment integrated in STEP 7 Basic, e.g.:■ Application- the implemented protocol drivers that are used.The CM 1241 communication modules are used for quick, highperformanceserial data exchange via point-to-point connection.- the driver-specific characteristics that are used.Point-to-point connection is possible to, e.g.:■ Technical specifications• SIMATIC S7 automation systems and the systems of many6ES7 241-1CH30- 6ES7 241-1AH30-other manufacturers0XB00XB0• PrintersProduct type designation CM 1241 RS485 CM 1241 RS232• Robot controlsSupply voltages• ModemsRated value• Scanners•24 V DC Yes Yes• Bar code readers, etc.• permissible range, 20.4 V 20.4 Vlower limit (DC)■ Design• permissible range, 28.8 V 28.8 VThe CM 1241 communication modules have the same designfeatures as the basic devices.upper limit (DC)Current consumption• Installation on DIN rails:Current consumption, max. 220 mA;220 mA;The modules are snapped onto the rail next to the CPU on thefrom L5+; logic from L5+; logicright and are electrically and mechanically connected to eachother and to the CPU by the integral slide mechanism.Power loss• Direct installation:Power loss, typ. 1.1 W 1.1 WHorizontal or vertical mounting on DIN rail or direct mounting Interfacesin the cabinet using integral lugs.Number of interfaces 1 1The communication modules are equipped with the following:• Status LEDs for indicating “Send”, “Receive” and “Error”Interface physics,RS 232C (V.24)Yes• Communication interfaces:Available for the RS232 and RS485 physical transmissionmediaInterface physics,RS 422/RS 485 (X.27)Point-to-pointYesCable length, max. 1 000 m 10 m4Siemens ST 70 N · 20104/83