{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TM251MESC","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"TM251MESC","canonicalUrl":"https://aoctrl.com/schneider/TM251MESC","factsUrl":"https://aoctrl.com/api/mcp/products/TM251MESC","rawCanonicalId":null},"summary":{"shortDescription":"Schneider TM251MESC Controllers Programmable (Plc, Pac) — now discontinued, supplied from remaining surplus and broker stock.","salesMarkdown":"## Overview The TM251MESC is a Schneider Modicon M251 logic controller with 64 MB system RAM and 8 MB program memory, running on 24 V DC supply. It carries dual Ethernet ports (10BASE-T/100BASE-TX), USB, RS-232, RS-485, Modbus, and CANopen, and is rated for 15 gn 11 ms shock. The serial link supply is 5 V at less than 200 mA, sourced externally via the removable screw terminal block (5.08 mm pitch). No on-board I/O — this is a pure logic controller for distributed I/O over fieldbus. Compared to the TM241CE40T, the TM251MESC has 64 MB system RAM versus 8 MB, but no on-board discrete I/O — the TM241CE40T carries 40 I/O points including 4 fast inputs at 200 kHz. The TM251MESC is the right choice when you need large program memory and fieldbus networking, not local I/O density.","metaTitle":"Schneider TM251MESC Modicon M251 PLC, 64 MB RAM, dual Ethernet","metaDescription":"Schneider TM251MESC Modicon M251 logic controller: 64 MB system RAM, 8 MB program memory, dual Ethernet, USB, RS-232/485, Modbus, CANopen, 15 gn 11 ms shock, IP20, DIN rail.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":[],"specifications":{"Depth":"3.7 in (95 mm)","Width":"2.1 in (54 mm)","Height":"3.5 in (90 mm)","Supply":"Serial)serial link supply 5 V, <200 mA","Marking":"CE","Category":"US10MSX22533","Standards":"ANSI/ISA 12-12-01 CSA C22.2 No 142 CSA C22.2 No 213 IEC 61131-2:2007 Marine specification (LR, ABS, DNV, GL) UL 508","Insulation":"Non-insulated between supply and internal logic Between supply and ground 500 V AC","Backup time":"2 years 77 °F (25 °C)","Clock drift":"<= 60 s/month 77 °F (25 °C)","Battery type":"BR2032 lithium non-rechargeable 4 year(s)","Web services":"Web server","Port Ethernet":"Ethernet 10BASE-T/100BASE-TX - 2 copper cable","Data backed up":"128 MB built-in flash memory backup of user programs","Inrush current":"50 A","Realtime clock":"With","Memory capacity":"64 MB system memory RAM","Surge withstand":"1 kV shielded cable common mode IEC 61000-4-5 1 kV power lines common mode IEC 61000-4-5 0.5 kV power lines differential mode IEC 61000-4-5","lifecycle_stage":"current","Local signalling":"1 LED (green) for PWR 1 LED (green) for RUN 1 LED (red) for module error (ERR) 1 LED (red) for I/O error (I/O) 1 LED (green) for SD card access (SD) 1 LED (red) for BAT 1 LED (green) for Ethernet port activity 1 LED (green) for SL 1 LED (red) for bus fault on TM4 (TM4) 1 LED (green) for CANopen run 1 LED (green) for CANopen error","Mounting support":"Top hat type TH35-15 rail IEC 60715 Top hat type TH35-7.5 rail IEC 60715 plate or panel with fixing kit","Pollution degree":"2","Range of Product":"Modicon M251","Shock resistance":"15 gn 11 ms","Storage altitude":"0...9842.5 ft (0...3000 m)","Relative humidity":"10...95 %, without condensation in operation) 10...95 %, without condensation in storage)","Transmission rate":"1.2...115.2 kbit/s (115.2 kbit/s by default) 49.2 ft (15 m) RS485 1.2...115.2 kbit/s (115.2 kbit/s by default) 9.8 ft (3 m) RS232 480 Mbit/s 9.8 ft (3 m) USB","Operating altitude":"0...6561.68 ft (0...2000 m)","Vibration resistance":"3.5 mm 5...8.4 Hz symmetrical rail 3 gn 8.4...150 Hz symmetrical rail 3.5 mm 5...8.4 Hz panel mounting 3 gn 8.4...150 Hz panel mounting","Application structure":"3 cyclic master tasks + 1 freewheeling task 8 event tasks 4 cyclic master tasks 8 external event tasks","Communication service":"DHCP client Downloading Ethernet/IP slave device IEC VAR ACCESS Modbus TCP client Modbus TCP server Modbus TCP slave device Monitoring NGVL Programming Updating firmware SMS notifications FTP client/server SNMP client/server SQL client Send and receive email from the controller based on TCP/UDP library Web server (WebVisu & XWeb system) OPC UA server DNS client","Electrical connection":"removable screw terminal block power supply pitch 5.08 mm)","Nbr. of units in pkg.":"1","Supply voltage limits":"20.4...28.8 V","Data storage equipment":"<= 16 GB SD card optional)","Power consumption in W":"32.6...40.4 W with max number of I/O expansion module)","CANopen feature profile":"DR 303-1 DS 301 V4.02","IP degree of protection":"IP20 with protective cover in place","Immunity to microbreaks":"10 ms","Electromagnetic emission":"Conducted emissions 120...69 dBµV/m QP power lines)10...150 kHz IEC 55011 Conducted emissions 63 dBμV/m QP power lines)1.5...30 MHz IEC 55011 Radiated emissions 40 dBμV/m QP class A 10 m)30...230 MHz IEC 55011 Conducted emissions 79...63 dBμV/m QP power lines)150...1500 kHz IEC 55011 Radiated emissions 47 dBμV/m QP class A 10 m)230...1000 MHz IEC 55011","Product or Component Type":"Logic controller","[Us] rated supply voltage":"24 V DC","Integrated connection type":"USB port mini B USB 2.0 Non isolated serial link serial RJ45 RS232/RS485 Dual-port Ethernet RJ45 CANopen J1939 SUB-D 9","Number of server device(s)":"63 CANopen","Communication port protocol":"USB port USB - SoMachine-Network Non isolated serial link Modbus master/slave - RTU/ASCII or SoMachine-Network","Maximum number of connections":"8 Modbus server 8 Modbus client 16 Ethernet/IP target 4 FTP server 10 web server 8 SoMachine protocol","Resistance to fast transients":"2 kV IEC 61000-4-4 power lines) 1 kV IEC 61000-4-4 Ethernet line) 1 kV IEC 61000-4-4 serial link)","Execution time for 1 KInstruction":"0.3 ms event and periodic task 0.7 ms other instruction","Ambient Air Temperature for Storage":"-13...158 °F (-25...70 °C)","Resistance to conducted disturbances":"10 V 0.15...80 MHz IEC 61000-4-6 3 V 0.1...80 MHz 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) Marine specification (LR, ABS, DNV, GL)","Resistance to electromagnetic fields":"9.1 V/m (10 V/m) 80 MHz...1 GHz IEC 61000-4-3 2.7 V/m (3 V/m) 1.4 GHz...2 GHz IEC 61000-4-3 0.9 V/m (1 V/m) 2 GHz...3 GHz IEC 61000-4-3","Ambient air temperature for operation":"14...95 °F (-10...35 °C) vertical installation) 14...131 °F (-10...55 °C) horizontal installation)","Resistance to electrostatic discharge":"8 kV in air IEC 61000-4-2 4 kV on contact IEC 61000-4-2"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$308.81 – $760.08","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/518d8e2e14c112aa5f462eaebbd27f93.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/TM251MESC/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/TM251MESC","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/schneider/TM251MESC when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:21:01.794Z","lastPublished":"2026-09-02T08:21:01.794Z","indexable":true}}