Schneider Electric TM241C24T Modicon M241 24 I/O Controller

TM241C24T: Modicon M241 24-I/O transistor logic controller

The TM241C24T is a Modicon M241 logic controller built for machine control. It carries 24 built-in I/O points, fourteen 24 V DC inputs and ten transistor outputs, and offers four high-speed counting inputs, four pulse-train outputs, two serial ports and USB. This version has no Ethernet port.

The M241 is a step above the M221 in processing power and motion capability. The TM241C24T is the basic member of the three-reference group on this site: it keeps the 24-point I/O layout but leaves out the Ethernet interface found on TM241CE24T and TM241CE24U. Seven Star LLC supplies the TM241C24T in Oman and the GCC as an independent supplier based in Muscat.

Memory, tasks and timing of the TM241C24T

The controller has 64 MB of system RAM and 128 MB of built-in flash for the user program, with an optional SD card up to 16 GB. Execution time is 0.3 ms for 1 K instructions in an event or periodic task and 0.7 ms for other instructions. The task structure offers up to four cyclic master tasks (or three plus a freewheeling task), eight event tasks and eight external event tasks.

A battery of type BR2032 with a life of four years keeps data and the clock, with two years of backup at 25 °C once the supply is removed. Clock drift is 60 s per month or less at 25 °C, so periodic synchronisation is advisable for time-stamped logging.

Technical specifications of the TM241C24T

Selection checklist and RFQ details for the TM241C24T

Check these points before ordering:

• that 14 inputs and 10 outputs cover the I/O list with reserve
• whether the machine needs Ethernet, which this reference does not provide
• output wiring: this model uses source transistors, whereas TM241CE24U uses sink
• the number of pulse axes and fast counters required
• spare capacity on the 24 V supply for 50 A inrush

Send the quantity, delivery site and software version used for programming with your request.

The TM241C24T against its Ethernet siblings

The table compares the three M241 24-point references.

Installing the TM241C24T

The housing is 150 mm wide, 90 mm high and 95 mm deep and weighs 0.53 kg. Mount it on a 35 mm DIN rail or on a panel with the fixing kit. Terminal blocks for inputs, outputs and the 24 V DC supply are removable screw types at 5.08 mm pitch. Inrush current is 50 A, higher than the M221, so check the 24 V supply and its protective device.

Orientation affects the temperature rating: −10 to 55 °C horizontal and −10 to 50 °C vertical. Cable limits are 50 m unshielded for inputs and outputs, 10 m shielded for fast inputs and 3 m shielded for fast outputs.

Serial and USB links of the TM241C24T

Serial 1 is an RJ45 connector for RS232 or RS485 and can supply 5 V at up to 200 mA. Serial 2 is a removable screw terminal block, RS485 only. A mini-B USB 2.0 port serves programming and download. The datasheet lists Modbus master/slave on the serial lines, with rates from 1.2 to 115.2 kbit/s.

For a plant with several serial devices (VFDs, meters, remote I/O) two ports allow a clean split between the field bus and a supervisory link. If a plant network is needed instead, choose the Ethernet versions.

Inputs, outputs and fast functions of the TM241C24T

Fourteen inputs at 24 V DC are fitted, with eight of them fast inputs that respond in 2 µs or less. Four fast inputs can count at up to 200 kHz in single-phase or pulse/direction mode, or at 100 kHz in A/B mode, while the other fourteen inputs count at 1 kHz. Filtering can be set between 0 and 12 ms on standard inputs.

Of the ten transistor outputs, Q0 to Q3 are fast outputs that can generate PTO pulses at 100 kHz on four channels, PWM up to 20 kHz or pulse output at 100 kHz, while Q4 to Q9 switch at 1 kHz. Output current per point is 0.5 A (0.1 A for fast outputs in PTO mode), the outputs are protected against short circuit, and a fast output resets after 12 s.

Uses of the TM241C24T across Oman and the GCC

Typical roles are packaging lines, conveyors, pump skids, compressor packages and water treatment units where positioning or fast counting is needed but plant-network connection is handled elsewhere. Extreme heat in unconditioned panels is the main field issue, so a cabinet design that holds the ambient inside the datasheet limit is more important than the controller itself.

Certifications listed are cULus, CE, UKCA and RCM, plus marine approvals from DNV-GL, ABS and LR. Humidity is rated 10 to 95 % without condensation and the altitude limit is 2000 m.

Documents and quotation

The Schneider Electric datasheet for the this unit is attached on this page, so you can compare the listed values with your design before ordering. Check the inrush current and cable-length notes first.

To request a quotation for the TM241C24T, send the quantity, delivery destination and any project reference through the RFQ form. Seven Star LLC supplies Schneider Electric automation products in Oman and the GCC as an independent supplier based in Muscat, and we confirm stock status and lead time against your request.