TM251MESC
Schneider Electric
Overview
The TM251MESC is a Logic controller in the Modicon M251 range from Schneider Electric. It executes control logic for Modicon TM logic controller / I/O architectures and operates from a Limits 20.4…28.8 V supply.
Application & Technical Notes
As a logic controller, the TM251MESC is intended for deployment in panel-based control cabinets and machine enclosures where Modicon TM logic controller / I/O equipment is installed. It hosts the application program, executes the control cycle and orchestrates I/O scanning, communication and diagnostics for the station.
Key published characteristics include a Limits 20.4…28.8 V rating, top hat type th35-15 rail iec 60715 mounting. These values should be confirmed against the current manufacturer datasheet before final selection, as options and suffixes vary by configuration.
Maintenance & Diagnostics
Avoid condensation — the rated humidity is 10…95 %, without condensation in operation); store and operate the module in a dry, pollution-degree-appropriate enclosure. Back up the application program and parameter set before any firmware or hardware change; verify the memory/real-time-clock battery where fitted and replace on schedule. Monitor the module health LED and controller diagnostics; plan spares for critical stations to minimise downtime. Always de-energise the circuit and follow lock-out/tag-out before handling; refer to the official instruction bulletin for service procedures.
Sourcing & Procurement
When sourcing the TM251MESC, distinguish three supply tiers: (1) genuine Schneider Electric stock from an authorised distributor; (2) compatible equivalents or surplus/NOS (new-old-stock) from third parties; (3) alternative parts offering equivalent function. Genuine supply carries the full warranty and traceability; compatible or alternative items may be cheaper but should be validated for form, fit, firmware and certification before use in a live system. PLCXpert publishes this page as an independent reference and does not sell the part — verify every claim with the manufacturer or your distributor.
Confirm the CPU matches your Modicon TM logic controller / I/O architecture, memory size, firmware revision and any required option/communication modules. Lead times and pricing vary by region and lifecycle status; obtain a current quote from an authorised channel rather than relying on stale listings.
Frequently Asked Questions
What is the TM251MESC?
The TM251MESC is a logic controller in the Modicon M251 range from Schneider Electric. It is described by the manufacturer as: Logic controller.
What are the key technical ratings of the TM251MESC?
Its published highlights include Limits 20.4…28.8 V. Full electrical, mechanical and environmental limits are listed in the manufacturer datasheet and should be confirmed for your exact suffix.
How is the TM251MESC mounted or installed?
It uses Top hat type TH35-15 rail IEC 60715. Follow the manufacturer mounting and torque guidance and observe clearance, grounding and ventilation requirements.
Is the TM251MESC compatible with my controller?
It is part of the Modicon TM logic controller / I/O family. Confirm the specific rack, firmware revision, slot rules and configuration with the controller documentation before purchase, as compatibility depends on the exact system build.
What should I check before buying the TM251MESC?
Verify the genuine part number and suffix, confirm it matches your platform and ratings, check the current lifecycle/availability status, and buy from an authorised distributor. PLCXpert provides this reference only and does not sell the component.
Specifications
TM251MESC logic controller, Modicon M251,
Main
| Note | Range Of Product Modicon M251 Product Or Component Type Logic controller [Us] Rated Supply Voltage 24 V DC |
|---|
Complementary
| Note | Maximum Number Of I/O Expansion Module 7 local 14 remote Supply Voltage Limits 20.4…28.8 V Inrush Current 50 A Power Consumption In W 32.6…40.4 W with max number of I/O expansion module) Memory Capacity 64 MB system memory RAM Data Backed Up 128 MB built-in flash memory backup of user programs Data Storage Equipment <= 16 GB SD card optional) Battery Type BR2032 lithium non-rechargeable 4 year(s) Backup Time 2 years 77 °F (25 °C) Execution Time For 1 Kinstruction 0.3 ms event and periodic task 0.7 ms other instruction Application Structure 3 cyclic master tasks + 1 freewheeling task 8 event tasks 4 cyclic master tasks 8 external event tasks Realtime Clock With Clock Drift <= 60 s/month 77 °F (25 °C) 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 Supply Serial)serial link supply 5 V, <200 mA Transmission Rate 1.2...115.2 kbit/s (115.2 kbit/s by default) 49.21 ft (15 m) RS485 1.2...115.2 kbit/s (115.2 kbit/s by default) 9.84 ft (3 m) RS232 480 Mbit/s 9.84 ft (3 m) USB Communication Port Protocol USB port USB - SoMachine-Network Non isolated serial link Modbus master/slave - RTU/ASCII or SoMachine-Network Port Ethernet Ethernet 10BASE-T/100BASE-TX - 2 copper cable Web Services Web server 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 Maximum Number Of Connections 8 Modbus server 8 Modbus client 16 Ethernet/IP target 4 FTP server 10 web server 8 SoMachine protocol Canopen Feature Profile DR 303-1 DS 301 V4.02 Number Of Server Device(S) 63 CANopen Local Signalling PWR 1 LED green) RUN 1 LED green) Module error (ERR) 1 LED red) I/O error (I/O) 1 LED red) SD card access (SD) 1 LED green) BAT 1 LED red) Ethernet port activity 1 LED green) SL 1 LED green) Bus fault on TM4 (TM4) 1 LED red) CANopen run 1 LED green) CANopen error 1 LED green) Electrical Connection removable screw terminal block power supply pitch 5.08 mm) Insulation Non-insulated between supply and internal logic Between supply and ground 500 V AC |
| Marking CE | 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 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 Height 3.54 in (90 mm) Depth 3.74 in (95 mm) Width 2.13 in (54 mm) Net Weight 0.49 lb(US) (0.22 kg) |
Environment
| Note | Standards ANSI/ISA 12-12-01 |
|---|---|
| CSA C22.2 No 142 | N/A |
| CSA C22.2 No 213 | IEC 61131-2:2007 |
| Marine specification (LR, ABS, DNV, GL) | UL 508 Product Certifications cULus CE UKCA DNV-GL ABS LR Resistance To Electrostatic Discharge 8 kV in air IEC 61000-4-2 4 kV on contact IEC 61000-4-2 Resistance To Electromagnetic Fields 9.14 V/yd (10 V/m) 80 MHz...1 GHz IEC 61000-4-3 2.74 V/yd (3 V/m) 1.4 GHz...2 GHz IEC 61000-4-3 0.91 V/yd (1 V/m) 2 GHz...3 GHz IEC 61000-4-3 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) 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) 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 Immunity To Microbreaks 10 ms Ambient Air Temperature For Operation 14…95 °F (-10…35 °C) vertical installation) 14…131 °F (-10…55 °C) horizontal installation) Ambient Air Temperature For Storage -13…158 °F (-25…70 °C) Relative Humidity 10…95 %, without condensation in operation) 10…95 %, without condensation in storage) Ip Degree Of Protection IP20 with protective cover in place Pollution Degree 2 Operating Altitude 0...2000 m Storage Altitude 0.00…9842.52 ft (0…3000 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 Shock Resistance 15 gn 11 ms |
Packing Units
| Note | Unit Type Of Package 1 PCE Number Of Units In Package 1 1 Package 1 Height 4.19 in (10.632 cm) Package 1 Width 4.67 in (11.868 cm) Package 1 Length 6.58 in (16.721 cm) Package 1 Weight 13.40 oz (380.0 g) |
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Reproduced from the manufacturer's published data. Values marked "Not available" are absent from the source document.