Case Study: Solving a Mixed-Signal Control Challenge
A packaging line needed to control high-power relays, drive a stepper motor, and communicate over Ethernet and CANopen—all from one compact controller. The existing setup used separate relays, a motion card, and a communication gateway. The Schneider TM241CEC24R Modicon M241 logic controller solved this by combining 24 discrete I/O, relay and transistor outputs, Ethernet, CANopen, and dual serial ports in a single unit. This case study shows how the TM241CEC24R delivers integrated control for complex machines.
What Is the Schneider TM241CEC24R?
The TM241CEC24R is a logic controller from Schneider Electric’s Modicon M241 range. It operates on 100…240 V AC supply and provides 24 discrete I/O points: 14 standard inputs, 8 fast inputs, 6 relay outputs, 4 transistor outputs, and 4 fast outputs. The controller includes 64 MB RAM and 128 MB flash memory for user programs. A real-time clock with battery backup (BR2032 lithium, 4-year life) ensures time-stamped data logging. The integrated Ethernet port supports 10/100 Mbit/s communication, while CANopen and dual serial links (RS232/RS485) enable connectivity to drives, HMIs, and remote I/O.
Technical Specifications That Matter
Power and I/O
The 100…240 V AC supply accepts 85…264 V, suiting global industrial power. Relay outputs handle 5…125 V DC or 5…250 V AC at 2 A, directly switching solenoids and contactors. Transistor outputs provide 24 V DC at 0.5 A with short-circuit protection and automatic reset. Fast outputs reach 100 kHz in PLS mode for precise positioning.
Communication and Expansion
Ethernet supports Modbus TCP, EtherNet/IP, and OPC UA server. CANopen supports up to 63 slaves. Two serial ports (RS232/RS485) run Modbus master/slave. You can add up to 7 local I/O expansion modules or 14 remote I/O modules.
Memory and Processing
64 MB RAM and 128 MB flash store programs and data. Execution time is 0.3 ms per 1K instructions for event tasks and 0.7 ms for other instructions. An optional SD card (up to 16 GB) stores recipes and logs.
Applications and Integration
Packaging and Material Handling
The TM241CEC24R controls conveyors, diverters, and labelers. Relay outputs drive pneumatic valves, while fast transistor outputs command stepper drives via PTO (4 channels at 100 kHz). Ethernet connects to a SCADA system for real-time monitoring.
Building Automation
In HVAC and pump control, the controller’s 24 V DC sensor supply (400 mA) powers pressure transmitters. Modbus serial links integrate variable frequency drives. The real-time clock schedules start/stop cycles.
Marine and Heavy Industry
Certified to DNV-GL, ABS, and LR marine specifications, the TM241CEC24R withstands vibration (3.5 mm at 5…8.4 Hz) and shock (15 gn for 11 ms). It operates from -10…50 °C in vertical installations.
Installation and Setup
Mount the controller on a top hat TH35-15 or TH35-7.5 rail per IEC 60715, or on a panel with a fixing kit. Use removable screw terminal blocks (5.08 mm pitch) for I/O and 24 V DC power. Keep unshielded input cables under 50 m and shielded fast input cables under 10 m. For outputs, unshielded cables can run up to 50 m; shielded fast outputs should stay under 3 m. The IP20 rating requires a protective cover in place. Ensure pollution degree 2 and altitude below 2000 m.
Maintenance and Reliability
Inspect terminals every six months for tightness. The BR2032 battery lasts up to 4 years; replace when the BAT LED lights. Backup time is 2 years at 25 °C. The controller resists electrostatic discharge (8 kV air, 4 kV contact) and electromagnetic fields (10 V/m). For safety-related applications, always follow the manufacturer’s safety manual.
Why Choose the TM241CEC24R from SpareTechPLC?
SpareTechPLC supplies genuine Schneider Electric controllers with full traceability. Before ordering, verify your I/O count, communication protocols, and supply voltage. The TM241CEC24R suits mixed relay/transistor applications requiring Ethernet and CANopen. Contact SpareTechPLC for current lifecycle status and availability.
Frequently Asked Questions
What is the difference between relay and transistor outputs on the TM241CEC24R?
Relay outputs handle higher voltages (up to 250 V AC) and currents (2 A), ideal for direct load switching. Transistor outputs switch faster (up to 100 kHz) and provide short-circuit protection, but only for 24 V DC loads.
Can I use the TM241CEC24R for motion control?
Yes. It supports 4 PTO channels at 100 kHz and 4 fast inputs for HSC at 200 kHz. This enables simple positioning tasks without a separate motion controller.
How many expansion modules can I add?
You can add up to 7 local I/O expansion modules or 14 remote I/O modules, depending on your architecture.
What communication protocols does the TM241CEC24R support?
It supports Modbus TCP, EtherNet/IP, OPC UA server, CANopen, and Modbus serial (RS232/RS485).
Is the TM241CEC24R suitable for marine applications?
Yes, it holds marine certifications including DNV-GL, ABS, and LR, and meets vibration and shock standards.
