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FX3S-20MR/DS

The FX3S-20MR/DS is an entry-level, compact PLC from Mitsubishi Electric’s FX3S Series, designed for small-scale automation and simple control tasks. It features an integrated 20 I/O configuration (12 inputs / 8 relay outputs) and a built-in power supply (24V DC), making it ideal for cost-sensitive applications requiring basic logic control.

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Key Specifications
Category Specification
Model FX3S-20MR/DS
Series Mitsubishi FX3S (Micro PLC)
I/O Configuration 12 digital inputs (24V DC) / 8 relay outputs
Power Supply 24V DC (built-in, for CPU and inputs)
Program Memory 8,000 steps (non-expandable)
Processing Speed 0.21 μs per instruction (basic commands)
Communication Built-in RS-422 (programming port) / Optional FX3S-485-BD (RS-485)
Expansion Capability Supports FX3S expansion modules (up to 2 modules)
Programming Software GX Works2 (recommended) or GX Developer
Isolation Photocoupler isolation (inputs) / Relay contacts (outputs)
Operating Temp. -10°C to 55°C (14°F to 131°F)
Enclosure Rating IP20 (panel-mounted)
Features & Benefits
✔ Compact & Cost-Effective – All-in-one design with built-in I/O and power supply.
✔ Relay Outputs – Supports AC/DC loads (up to 250V AC, 2A per point).
✔ Easy Programming – Compatible with GX Works2 (ladder logic, step ladder).
✔ Basic Connectivity – RS-422 port for programming; optional RS-485 expansion.
✔ Durability – Relay life: 100,000 operations (resistive load).

Wiring & Installation
Inputs (X0–X13):

24V DC sinking/sourcing (common: 24V DC)

Outputs (Y0–Y7):

Relay contacts (NO/NC, 250V AC max.)

Power Supply:

24V DC input (for CPU and inputs)