I. Basic Overview
Applicable Models: Schneider Modicon M241/M251/M262 series PLC expansion modules
TM3AQ4: Screw terminal version; the same model TM3AI8G is spring clip terminal version
Function: Collect on-site pressure, temperature, level, flow, frequency converter, etc. 4-20mA / voltage type analog signals Schneider … 。
Core Channel Parameters
Number of channels: 8 isolated analog input channels
Supported signal types (software configurable)
Voltage: 0~10V DC, -10V~+10V DC
Current: 0~20mA, 4~20mA (industrial standard transmitter signal)
A/D resolution: 12 bits (11 bits + sign bit, total 4096 quantization steps)
Measurement accuracy: ±0.2% of full scale at 25℃
Single-channel sampling time: ≤1ms, supports software setting for 0~10s input filtering and anti-jitter
Input impedance
Voltage signal: ≥1MΩ
Current signal: ≤50Ω
Overload protection: maximum withstand voltage 13V, withstand current 40mA, equipped with hardware protection against overvoltage and overcurrent
Electrical and Environmental Specifications
Power supply: DC 24V (allowable 20.4~28.8V), module power consumption approximately 30mA
Protection level: IP20 (suitable for installation in control cabinets only)
Operating temperature: -25℃ ~ +70℃; storage temperature: -40℃ ~ +85℃
Installation: standard DIN TH35 rail snap-in installation
Dimensions: 90mm × 23.6mm × 70mm, net weight 110g
Connection: plug-in screw terminals, recommended to use shielded twisted pair, maximum wiring distance 30 meters
Main Functional Features
Channel fault diagnosis: can detect open circuit, short circuit, and over-range, PLC program can read fault codes
Multi-signal compatibility: 8 channels can be independently configured in voltage/current mode, no hardware jumpers required, only software settings
Anti-interference design: low crosstalk between channels (≤1LSB), meets industrial EMC electromagnetic compatibility standards
Expansion capability: M251 host can mount up to 7 TM3 series I/O expansion modules
Hot-swappable support: modules can be plugged in and replaced during shutdown, not supported during operation
Typical Application Scenarios
Pressure, liquid level, temperature, flow transmitter signal acquisition
Feedback signal reading for frequency converters, servo systems, instruments
Process data acquisition for water treatment, HVAC, air compressor, packaging machinery, new energy equipment
Model Selection
TM3AI8: screw fastening terminals, commonly used in industrial applications
TM3AI8G: spring quick-insert terminals, no need for screwdriver, higher wiring efficiency
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