200 Series Economical Expansion Modules

Expand your 200 Series Economical PLC system with cost-effective modules for Digital I/O, Analog I/O, and Temperature measurement (PT100 / NTC). Designed for compact cabinets, OEM machines, and retrofit projects.

  • 24VDC system design
  • Compact footprint for DIN-rail cabinets
  • Quick selection by signal type & channel count
  • Suitable for OEM, small machines and upgrades
Quick Selection
  1. Need more sensors/actuators → Digital I/O
  2. Need transmitters or PID → Analog I/O
  3. Need heaters/ovens → Temperature
Tip: Send required DI/DO/AI/AO/Temp channels for a quick BOM recommendation.

Digital I/O Modules

Expand discrete inputs and relay outputs for sensors, push buttons, limit switches, solenoid valves, contactors and general-purpose loads. All models below are designed for 24V systems.

Model Description Power Supply Dimensions (mm)
GM221-I16 16 Digital Inputs 24V Power Supply 95×108×35
GM222-RQ16 16 Relay Outputs 24V Power Supply 95×108×35
GM223-I8RQ8 8 Digital Inputs, 8 Relay Outputs 24V Power Supply 95×108×35
GM223-I16RQ16 16 Digital Inputs, 16 Relay Outputs 24V Power Supply 150×108×35
Selection Tips:
  • Choose GM221 when you only need more inputs.
  • Choose GM222 when you only need more relay outputs.
  • Choose GM223 for combined DI + relay DO in one module.

Analog I/O Modules

Add analog input/output channels for transmitters and control signals. Common applications include pressure/flow/level sensors, PID control, VFD reference, and valve positioning. All models use 24VDC power supply.

Model Description Power Supply Dimensions (mm)
GM231-AI8 8 Analog Inputs 24VDC 95×108×35
GM232-AQ4 4 Analog Outputs 24VDC 95×108×35
GM235-AI4AQ2 4 Analog Inputs, 2 Analog Outputs 24VDC 95×108×35
GM235-AI8AQ4 8 Analog Inputs, 4 Analog Outputs 24VDC 150×108×35
Selection Tips:
  • GM231-AI8: best for multi-sensor input collection.
  • GM232-AQ4: best for multi-channel control outputs (VFD / valve / PID).
  • GM235: choose when you need AI + AO in one module.

Temperature Modules (PT100 / NTC) & Mixed I/O

Temperature acquisition modules for heating, ovens, drying lines and multi-zone thermal control. Choose PT100 for stable and accurate RTD measurement, or NTC (10K 3950) for cost-effective temperature sensing. Mixed models provide temperature inputs plus analog outputs for control.

Model Description Dimensions (mm)
GM231-P4 4 PT100 Inputs 95×108×35
GM231-P8 8 PT100 Inputs 95×108×35
GM231-N8 8 NTC Inputs (10K 3950) 95×108×35
GM235-P8AQ4 8 PT100 Inputs, 4 Analog Outputs 150×108×35
GM235-N8AQ4
Product link coming soon
 8 NTC Inputs (10K 3950), 4 Analog Outputs 150×108×35
Selection Tips:
  • PT100 modules are recommended when you need higher accuracy and stable measurement.
  • NTC (10K 3950) is a cost-effective choice for multi-point temperature monitoring.
  • Choose P8AQ4 / N8AQ4 when you need temperature acquisition plus multi-channel analog outputs.

Compatibility

These modules are designed to work with 200 Series Economical PLC systems. If you also need Standard PLC modules, please visit our Standard expansion module page.

FAQ

Q: Are all modules powered by 24V?

Yes. The economical series is designed around 24V control systems for easy cabinet wiring.

Q: How do I choose between PT100 and NTC?

Choose PT100 for better accuracy and stability. Choose NTC (10K 3950) for cost-effective, multi-point temperature monitoring.

Q: Can I get a complete BOM recommendation?

Yes. Send your PLC model and required DI/DO/AI/AO/Temp channels, and we will recommend the best module set.

Need Help Selecting Modules?

Tell us your required signals and channel count. We will recommend the most cost-effective expansion solution.

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