The Schneider Electric TM3DM16R is a modular discrete I/O expansion module designed to extend the I/O capabilities of Modicon TM3‑series programmable logic controllers (PLCs) such as M221, M241, M251, and M262. It combines digital inputs and relay outputs in a single compact DIN‑rail‑mountable unit.
Parameters
Inputs
Number of Input Channels: 8 digital inputs
Input Type: Type 1, IEC/EN 61131‑2
Logic Type: Sink/Source (can sense active high/low depending on wiring)
Rated Input Voltage: 24 V DC
Input Voltage Range: 0…28.8 V DC
Rated Input Current: ~5 mA per channel
Input Impedance: ~4.7 kΩ
Outputs
Number of Output Channels: 8 relay outputs
Output Type: Relay (NO – Normally Open) contacts
Rated Output Voltage: 24 V DC / 220 V AC (up to 250 V AC max)
Rated Output Current: 2 A per output
Max Load per Common: ~4 A (shared)
Turn‑on / Turn‑off Times: Typically ≤ 10 ms
Relay Life: ~20 million mechanical cycles (100 k cycles electrical under load)
Wiring & Connections
Connection Type: Removable screw terminal block for field wiring
Max Cable Length:
Input: up to ~50 m (164 ft) unshielded
Output: up to ~150 m (492 ft) unshielded
Indicators & Diagnostics
Status LEDs: Green LEDs for each channel indicate input/output state (ON/OFF)
Mounting & Environment
Mounting: DIN‑rail (TH35) per IEC 60715
Protection Rating: IP20 (indoor industrial use)
Weight: ~118 g (4.16 oz)
Operating Temperature: Typically −10 °C to +55 °C (consult official datasheet)
Features & Benefits
Combines digital inputs and relay outputs in one module (saves space).
Relay outputs support AC and DC loads up to 2 A, making it versatile for different actuator types.
Removable terminals simplify installation and maintenance.
Modular expansion supports scalable systems with TM3 bus couplers and controllers.
Typical Applications
Machine automation logic I/O extension
Sensing external switches, presence/limit devices
Driving small loads such as indicators, solenoids, contactors (via relay)
General purpose industrial control systems