Schneider Electric TM238LDD24DT Compact Logic Controller – 24 I/O, 24 V DC, Modicon M238 Series

The TM238LDD24DT from Schneider Electric belongs to the Modicon M238 logic controller range. This compact base delivers 24 discrete I/O in a DIN-rail form factor. Engineers use it for machine control, counting, positioning and serial communication tasks. The controller runs on 24 V DC supply and offers 500 kB internal RAM.

Summary

• The TM238LDD24DT combines 14 discrete inputs and 10 discrete outputs in one compact base.
• Eight fast inputs and four fast outputs support high-speed counting and PWM/PTO positioning.
• Two 100 kHz positioning channels handle PWM and PTO modes for motion-oriented applications.
• One isolated RJ45 serial link supports Modbus master/slave RTU/ASCII and character mode.
• The Modicon M238 series targets OEM machine builders who need flexible, expandable control.

Technical Specifications

• Brand: Schneider Electric
• Model: TM238LDD24DT
• Series: Modicon M238 logic controller
• Product type: Compact base, 24 discrete I/O
• Supply voltage: 24 V DC, limits 19.2...28.8 V, inrush current ≤ 35 A
• Power consumption: ≤ 17.2 W
• Memory: Internal RAM 500 kB; retain variables backed up by optional lithium thionyl chloride battery (TSXPLP01) for 1 year
• Discrete inputs: 8 fast inputs plus 6 standard inputs, 24 V DC, sink or source logic
• Input thresholds: state 1 ≥ 15 V / ≥ 2 mA; state 0 ≤ 5 V / ≤ 1.5 mA
• Input current: 8 mA fast input, 10.4 mA standard input
• Input impedance: 3 kOhm fast input, 2.3 kOhm standard input
• Input response time: 300 ns fast input, 3 ms standard input
• Input frequency: ≤ 100 kHz for standard and fast inputs (normal and counter mode)
• Configurable filtering: 4 ms, 2 ms, 1 ms, 0.4 ms and 0.004 ms fast input settings
• Anti-bounce filtering: 4 ms, 12 ms, 1.5 ms and 0 ms configurable input settings
• Discrete outputs: 6 standard outputs plus 4 fast outputs, 24 V DC, positive (source) or negative (sink) logic
• Output current: 20...500 mA standard output; ≤ 500 mA fast output in normal mode; ≤ 100 mA in PWM or PTO mode
• Output frequency: ≤ 100 kHz standard output; ≤ 20 kHz fast output in PWM mode; ≤ 100 kHz fast output in PTO mode
• Output response time: 0.25 ms fast output, < 1 ms standard output
• Protection: short-circuit, overvoltage and overload protection on outputs and fast outputs
• Leakage current: 0.05 mA standard output, ≤ 2 mA fast output; residual voltage ≤ 2 V
• Isolation: 500 V DC between channels and internal logic; 500 V for output groups and fast input pairs
• Cable length: ≤ 30 m shielded cable for most I/O; ≤ 10 m for counter-mode fast input and PWM/PTO fast output
• Counting inputs: 8 channels at 100 kHz, 32-bit resolution
• Positioning functions: 2 PWM/PTO channels at 100 kHz
• Execution speed: 0.971 µs Boolean instruction; 0.3 ms per 1 K instructions (70 % Boolean + 30 % fixed arithmetic)
• Real-time clock: drift 10 s/month at 25 °C
• Integrated connection: 1 isolated serial link, female RJ45, Modbus master/slave RTU/ASCII, character mode or SoMachine-Network RS232/RS485, 1.2...115.2 kbit/s
• Expansion: up to 7 I/O expansion modules; up to 248 I/O with HE-10 connector
• Mounting: 35 mm symmetrical DIN rail or panel
• Dimensions: 157 mm width, 118 mm height, 86 mm depth; weight 0.56 kg
• Operating temperature: -10...55 °C; storage -40...70 °C
• Humidity: 95 % without condensation
• Protection degree: IP20, pollution degree ≤ 2
• Altitude: 0...2000 m operating, 0...3000 m storage
• Vibration resistance: 1 gn, 3.5 mm, f = 5...150 Hz
• Shock resistance: 15 gn for 11 ms
• Dielectric strength: 500 V for 1 minute between supply and earth, and between I/O and earth
• Insulation resistance: > 10 MOhm at 500 V
• Microbreak immunity: 10 ms
• Certifications: CE, CSA, UL, GOST, CTick
• Local signalling: LEDs for RUN, ERR, PWR, Batt, SL1 and per-channel I/O state

Installation Guide

• Mount the controller on a 35 mm symmetrical DIN rail or a flat panel inside an enclosure.
• Keep clearance around the base for heat dissipation; the unit dissipates up to 17.2 W.
• Connect 24 V DC supply to the removable screw terminal block; observe 19.2...28.8 V limits.
• Wire standard inputs to the 7-terminal block and fast inputs to the 12-terminal block.
• Wire standard outputs to the 6-terminal block and fast outputs to the 10-terminal block.
• Use shielded cable for fast I/O; keep counter-mode and PWM/PTO cables within 10 m.
• Ground the enclosure properly to meet the 500 V dielectric strength and > 10 MOhm insulation ratings.
• Attach the optional TSXPLP01 battery if retain variables must survive power loss.
• Connect the programming terminal through the mini-B USB 2.0 port.
• Route the isolated RJ45 serial link separately from high-current power wiring.

Package Contents

• 1 × Schneider Electric TM238LDD24DT compact base
• 1 × removable screw terminal block for 24 V DC power supply
• 1 × removable screw terminal block, 7 terminals, for standard inputs
• 1 × removable screw terminal block, 6 terminals, for standard outputs
• 1 × removable screw terminal block, 12 terminals, for fast inputs
• 1 × removable screw terminal block, 10 terminals, for fast outputs

Shipping

• We ship orders through FedEx, UPS and DHL.
• Each controller travels in protective packaging suitable for international transport.
• Contact our sales team for lead time and freight options before placing bulk orders.

FAQ

• Q: How many I/O does the TM238LDD24DT provide?
  A: It provides 14 discrete inputs and 10 discrete outputs, including 8 fast inputs and 4 fast outputs.
• Q: Can I expand the controller?
  A: Yes. It accepts up to 7 I/O expansion modules, reaching up to 248 I/O with HE-10 connectors.
• Q: What positioning functions does it support?
  A: It offers 2 PWM/PTO channels at 100 kHz for positioning tasks.
• Q: Which serial protocols does it support?
  A: It supports Modbus master/slave RTU/ASCII, character mode and SoMachine-Network RS232/RS485.
• Q: What is the operating temperature range?
  A: The controller operates from -10 °C to 55 °C and stores from -40 °C to 70 °C.
• Q: How long do retain variables last without power?
  A: The internal battery holds retain variables for 3 days 22 hours 10 years; the optional TSXPLP01 battery extends backup to 1 year.

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