1. Key Functions

• 64-point isolated I/O (32IN / 32OUT)

  Connects operation panel, limit switches, solenoids, tool changers, coolant/lube systems.

• Spindle encoder & servo signal processing

  Handles spindle speed, orientation, gear shift, and servo enable/alarm signals.

• 24VDC isolated interface

  Opto-isolation + surge protection for harsh shop-floor environments.

• M/S/T code signal exchange

  Manages auxiliary functions (coolant, clamp, tool number).

2. Specifications

• I/O Points: 32 × Input / 32 × Output (optically isolated)

• Input Voltage: 24VDC ±10% (NPN/PNP compatible)

• Output: Transistor, 0.5A max per point

• Connectors: 2 × 50-pin flat cable headers

• Operating Temp: 0°C ~ +55°C

• Mounting: Standard CNC rack slot (paired with CP01, PWR)

3. ESRO vs. ESR01/ESR01B

• JANCD-ESRO = Early B-series I/O board (letter O)

• JANCD-ESR01/ESR01B = Later revised I/O boards (digit 0)

• Not plug-and-play; different pinout, cannot directly replace each other.

4. Common Faults

• I/O points no response

• Spindle signal loss

• Panel keys dead

• “EXTERNAL I/O ERROR” alarm