Main range of productModicon M251 product or component typeLogic controller [Us] rated supply voltage24 V DC Complementary maximum number of I/O expansion module7 (local)14 (remote) supply voltage limits20.4…28.8 V inrush current50 A power consumption in W32.6…40.4 W (with max number of I/O expansion module) memory capacity8 MB for program64 MB for system memory RAM data backed up128 MB built-in flash memory for backup of user programs data storage equipment<= 16 GB SD card (optional) battery typeBR2032 lithium non-rechargeable, battery life: 4 year(s) backup time2 years at 25 °C execution time for 1 KInstruction0.3 ms for event and periodic task0.7 ms for other instruction execution time per instruction0.022 µs application structure4 cyclic master tasks8 event tasks3 cyclic master tasks + 1 freewheeling task8 external event tasks realtime clockWith clock drift<= 60 s/month at 25 °C integrated connection typeUSB port with mini B USB 2.0 connectorNon isolated serial link serial with RJ45 connector and RS232/RS485 interface Dual-port Ethernet 1 with RJ45 connectorEthernet port Ethernet 2 with RJ45 connector supply(serial)serial link supply: 5 V, <200 mA transmission rate1.2...115.2 kbit/s (115.2 kbit/s by default) for bus length of 15 m for RS4851.2...115.2 kbit/s (115.2 kbit/s by default) for bus length of 3 m for RS232480 Mbit/s for bus length of 3 m for USB communication port protocolUSB port: USB - SoMachine-NetworkNon isolated serial link: Modbus master/slave - RTU/ASCII or SoMachine-Network port EthernetEthernet 1 marking 10BASE-T/100BASE-TX - 2 copper cableEthernet 2 marking 10BASE-T/100BASE-TX - 1 copper cable web servicesWeb server communication serviceDownloadingIEC VAR ACCESSModbus TCP clientModbus TCP serverModbus TCP slave deviceMonitoringNGVLProgrammingUpdating firmwareSMS notificationsDHCP client (Eth1)DHCP server (Eth2)Ethernet/IP originator (Eth2)Ethernet/IP target (Eth1, Eth2)Ethernet/IP scanner (Eth2)Modbus TCP I/O Scanner and Messaging (Eth2)FDRFTP client/serverSNMP client/serverSQL clientSend and receive email from the controller based on TCP/UDP libraryWeb server (WebVisu & XWeb system)OPC UA serverDNS client maximum number of connections8 Modbus server8 Modbus client16 Ethernet/IP target4 FTP server10 web server8 SoMachine protocol number of slave16 Ethernet/IP: 64 Modbus TCP: cycle time10 ms 16 Ethernet/IP64 ms 64 Modbus TCP local signalling1 LED (green)PWR: 1 LED (green)RUN: 1 LED (red)module error (ERR): 1 LED (red)I/O error (I/O): 1 LED (green)SD card access (SD): 1 LED (red)BAT: 1 LED (green)SL: 1 LED (red)bus fault on TM4 (TM4): 1 LED (green)Ethernet activity (ETH1): 1 LED (green)Ethernet activity (ETH2): electrical connectionremovable screw terminal blockpower supply (pitch 5.08 mm) insulationNon-insulated between supply and internal logicBetween supply and ground at 500 V AC markingCE surge withstand1 kV shielded cable common mode conforming to EN/IEC 61000-4-51 kV power lines common mode conforming to EN/IEC 61000-4-50.5 kV power lines differential mode conforming to EN/IEC 61000-4-5 mounting supportTop hat type TH35-15 rail conforming to IEC 60715Top hat type TH35-7.5 rail conforming to IEC 60715 plate or panel with fixing kit height90 mm depth95 mm width54 mm net weight0.22 kg Environment standardsANSI/ISA 12-12-01CSA C22.2 No 142CSA C22.2 No 213EN/IEC 61131-2:2007Marine specification (LR, ABS, DNV, GL)UL 1604UL 508 product certificationsCULusCSA resistance to electrostatic discharge8 kV in air conforming to EN/IEC 61000-4-24 kV on contact conforming to EN/IEC 61000-4-2 resistance to electromagnetic fields10 V/m 80 MHz...1 GHz conforming to EN/IEC 61000-4-33 V/m 1.4 GHz...2 GHz conforming to EN/IEC 61000-4-31 V/m 2 GHz...3 GHz conforming to EN/IEC 61000-4-3 resistance to fast transients2 kV (power lines) conforming to EN/IEC 61000-4-41 kV (Ethernet line) conforming to EN/IEC 61000-4-41 kV (serial link) conforming to EN/IEC 61000-4-4 resistance to conducted disturbances10 V 0.15...80 MHz conforming to EN/IEC 61000-4-63 V 0.1...80 MHz conforming to Marine specification (LR, ABS, DNV, GL)10 V spot frequency (2, 3, 4, 6.2, 8.2, 12.6, 16.5, 18.8, 22, 25 MHz) conforming to Marine specification (LR, ABS, DNV, GL) electromagnetic emissionConducted emissions - test level: 120...69 dBµV/m QP ( power lines) at 10…150 kHz conforming to EN/IEC 55011Conducted emissions - test level: 63 dBμV/m QP ( power lines) at 1.5…30 MHz conforming to EN/IEC 55011Radiated emissions - test level: 40 dBμV/m QP class A ( 10 m) at 30…230 MHz conforming to EN/IEC 55011Conducted emissions - test level: 79...63 dBμV/m QP ( power lines) at 150…1500 kHz conforming to EN/IEC 55011Radiated emissions - test level: 47 dBμV/m QP class A ( 10 m) at 230…1000 MHz conforming to EN/IEC 55011 immunity to microbreaks10 ms ambient air temperature for operation-10…35 °C (vertical installation)-10…55 °C (horizontal installation) ambient air temperature for storage-25…70 °C relative humidity10…95 %, without condensation (in operation)10…95 %, without condensation (in storage) IP degree of protectionIP20 with protective cover in place pollution degree2 operating altitude0...2000 m storage altitude0…3000 m vibration resistance3.5 mm at 5…8.4 Hz on symmetrical rail3 gn at 8.4…150 Hz on symmetrical rail3.5 mm at 5…8.4 Hz on panel mounting3 gn at 8.4…150 Hz on panel mounting shock resistance15 gn for 11 ms Offer Sustainability Sustainable offer statusGreen Premium product REACh Regulation REACh free of SVHCYes EU RoHS DirectivePro-active compliance (Product out of EU RoHS legal scope)
EU RoHS Declaration
Mercury freeYes RoHS exemption information China RoHS Regulation Environmental Disclosure Circularity Profile WEEEThe product must be disposed on European Union markets following specific waste collection and never end up in rubbish bins
CatalogueFormatSizeAdd to My DocumentsUser guideFormatSizeAdd to My Documentsprp.document.label.format pdfSize 7.9 MBDate 12/1/19DescriptionThe purpose of this document is to help you to program and operate your Modicon M251 Logic Controller with the EcoStruxure Machine Expert software.prp.document.label.format pdfSize 2.8 MBDate 12/1/19DescriptionUse this document to:- Install and operate your M251 Logic Controller.- Connect the M251 Logic Controller to a programming device equipped with EcoStruxure Machine Expert software.- Interface the M251 Logic Controller with I/O expansion modules, HMI and other devices.- Familiarize yourself with the M251 Logic Controller features.prp.document.label.format pdfSize 1.2 MBDate 1/3/18DescriptionThis guide describes the hardware implementation of TM4 expansion modules. It provides theparts description, characteristics, wiring diagrams, and installation details for TM4 expansionmodules.prp.document.label.format pdfSize 2.7 MBDate 1/3/18DescriptionUse this document to: Install and operate your M251 Logic Controller. Connect the M251 Logic Controller to a programming device equipped with SoMachinesoftware. Interface the M251 Logic Controller with I/O expansion modules, HMI and other devices. Familiarize yourself with the M251 Logic Controller features.prp.document.label.format pdfSize 7.4 MBDate 1/3/18DescriptionThe purpose of this document is to help you to program and operate your Modicon M251 Logic Controller with the SoMachine software.prp.document.label.format pdfSize 663.8 KBDate 6/1/17DescriptionThis document describes an example how to implement an Altivar variable speed drive controlled via fieldbus EtherNet/IP.prp.document.label.format pdfSize 726.4 KBDate 6/1/17DescriptionThis document describes an example how to implement a Lexium servo drive controlled via fieldbus EtherNet/IP.prp.document.label.format pdfSize 1.8 MBDate 4/1/17DescriptionThis document acquaints you with the system functions and variables offered within the Modicon M251 Logic Controller. The M251 PLCSystem library contains functions and variables to get information from and send commands to the controller system. This document describes the data type functions and variables of the M251 PLCSystem library.prp.document.label.format pdfSize 1.3 MBDate 9/1/16DescriptionThis document describes the configuration of the TM4 expansion modules for SoMachine. For further information, refer to the separate documents provided in the SoMachine online help.prp.document.label.format pdfSize 3.6 MBDate 10/1/14DescriptionThis document describes a conveying application based on Modicon M251 Logic Controller. This document is an example of an application used to control a conveyor.This manual is intended for use by individuals knowledgeable and experienced in material handling technologies.The following basic knowledge is required: basic information on functionality, structure, and configuration of the controllers, drives, and HMI displays programming languages: IL, ST, FBD, SFC, LD, CFCCADFormatSizeAdd to My Documentsprp.document.label.format zipSize 17.6 MBDate 12/1/15DescriptionThe file includes wiring diagrams for Tested, Validated, and Documented Architectures (TVDA). The wiring diagrams are provided in a *.pdf file, as an EPLAN P8 project archive, and as *.dwg files exported from EPLAN P8.prp.document.label.format zipSize 16.3 MBDate 12/1/15DescriptionThe file includes wiring diagrams for Tested, Validated, and Documented Architectures (TVDA). The wiring diagrams are provided in a *.pdf file, as an EPLAN P8 project archive, and as *.dwg files exported from EPLAN P8.CertificateFormatSizeAdd to My DocumentsInstruction sheetFormatSizeAdd to My DocumentsChina RoHS declarationFormatSizeAdd to My DocumentsDeclaration of conformityFormatSizeAdd to My DocumentsEnd of Life InformationFormatSizeAdd to My DocumentsEU RoHS DeclarationFormatSizeAdd to My DocumentsMarine certificateFormatSizeAdd to My DocumentsProduct Environmental ProfileFormatSizeAdd to My Documents
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Software and FirmwareLanguage
FirmwareFormatSizeAdd to My Documentsprp.document.label.format zipSize 36.8 MBDate 10/24/18Files in document612.5 KB7z5.3 MBseco16.9 MBseco8.8 MB7z5.3 MBDescriptionThis new firmware corrects several bugs, there is no functionality integrated. Details available in Release Notes. The firmware is delivered in 2 different shapes, for SD card or Seco package for SoMachine v4.3. According to your preferred way to update the firmware, you can select one shape or another.prp.document.label.format zipSize 36.8 MBDate 6/19/18Files in documentseco16.9 MBseco8.8 MB7z5.2 MB7z5.3 MB568 KBDescriptionThis new firmware correct an issue identified by the Err LED blinking and the PLC not booting. The firmware is delivered in 2 different shapes, for SD card or Seco package for SoMachine v4.3. According to your preferred way to update the firmware, you can select one shape or another.
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Mounting and ClearanceClearanceMounting Position
NOTE: Keep adequate spacing for proper ventilation and to maintain an ambient temperature between -10°C (14°F) and 55°C (131°F).Acceptable Mounting
NOTE: Expansion modules must be mounted above the controller.Incorrect MountingDirect Mounting on a Panel Surface
Connections and SchemaUSB Connection to a PCEthernet Connection to a PC