## Key Specifications

 

• Manufacturer: Keyence
• Series: GT2
• Model: GT2-71MCP
• Type: Sensor Amplifier, Main Unit, Cable Type
• Output Type: PNP
• Power Supply: 20 to 30 V DC
• Display: Dual digital display for showing the current measurement and set points simultaneously.
• Outputs:
  • 3 Digital Outputs: HIGH, LOW, and GO for tolerance judgments (pass/fail checks).
  • 1 Analog Output: Provides a voltage or current signal (typically selectable +/-5 V, 1-5 V, or 4-20 mA) proportional to the measured value.
• Control Inputs: Multiple inputs for remote control from a PLC, including functions like PRESET, RESET, BANK switching (for multiple measurement programs), and TIMING.
• Compatibility: Designed to work with Keyence GT2 series sensor heads (e.g., GT2-H12, GT2-P12, etc.).

---

 

## Wiring / I/O Functions

 

The label on the unit provides a detailed color code for its integrated cable:

• POWER:
  • Brown: +V (20 to 30 V DC)
  • Blue: 0V (Ground)
• DIGITAL OUTPUTS (PNP):
  • Black: HIGH OUT (ON when measurement > upper limit)
  • White: LOW OUT (ON when measurement < lower limit)
  • Orange: GO OUT (ON when measurement is within tolerance)
• ANALOG OUTPUT:
  • Gray: ANALOG OUT
• CONTROL INPUTS:
  • Green: PRESET / HOLD (To set a zero/reference point or hold the current value)
  • Violet: BANK A (Input for program selection)
  • Yellow: BANK B (Input for program selection)
  • Red: RESET (To reset latched outputs or errors)
  • Pink/Violet: TIMING (Input to trigger a measurement)

---

 

## Functionality and Application

 

The GT2-71MCP amplifier is the core of a high-precision measurement system. It connects to a separate contact sensor head (probe), which physically touches a target to measure its dimension, thickness, or displacement with sub-micron accuracy.

The amplifier receives this raw data and performs several functions:

1. Displays the Measurement: Shows the exact dimension on its screen.
2. Performs Judgments: Compares the measurement to pre-set tolerance limits (HIGH and LOW) and activates the corresponding digital outputs.
3. Provides Analog Data: Converts the measurement into a proportional analog signal for data logging or advanced process control.
4. Responds to Remote Commands: Allows a PLC to control its functions, such as resetting the zero point for a new part or switching between different measurement setups stored in its memory banks.

This system is used in high-tolerance quality control applications, such as:

• Checking the dimensions of machined parts.
• Measuring the thickness of materials.
• Verifying component assembly and alignment.
• Detecting runout or vibration in rotating parts

data sheet

Keyence FS-V31P Digital Fiber Optic Amplifier