The GT2-71D is a high-accuracy digital contact sensor amplifier unit from the Keyence GT2 series. This model uses a DIN-rail mount, so it fits standard control cabinets. Moreover, it outputs a 90° phase difference differential square wave instead of a simple judgment signal. Consequently, the Keyence GT2-71D suits position feedback, motion control, and length measurement tasks.
First, the pulse resolution is selectable at 0.1, 0.5, 1, or 10 µm. The factory setting is 0.5 µm. This flexibility lets users match resolution to their controller's input capability. Additionally, the minimum phase difference is selectable at 0.5, 2.5, 5, or 25 µs. The factory value is 2.5 µs, which balances speed and signal stability.
Furthermore, the output signal is a 90° phase difference differential square wave. It complies with EIA-422 and uses a +5 V line driver. This differential design resists electrical noise in industrial environments. Besides, the control input supports origin return with a no-voltage input of 20 ms minimum. As a result, homing sequences are straightforward to implement.
Communication relies on optional GT2 series communication units, sold separately. Besides, this amplifier has no built-in ports or protocols. Therefore, users should plan network expansion around separate modules.
The supply voltage ranges from 10 to 30 VDC with ripple (p-p) 10% included, Class 2. However, power actually comes from the main unit, such as the GT2-100N or GT2-100P. The unit weighs approximately 110 g, including the power supply cable. Meanwhile, dimensions are not available in the current documentation.
Operating temperature ranges from -10 to +50 °C without freezing. Relative humidity stays between 35 and 85 % RH without condensation. The protection rating is not available. Additionally, storage temperature is not specified. Therefore, install the GT2-71D inside a clean, stable control cabinet.
Next, snap the GT2-71D onto a standard DIN rail inside the cabinet. First, connect the power supply cable to the main amplifier. Then, wire the differential pulse outputs to the motion controller or counter input. After that, connect the origin return no-voltage input if homing is required. Finally, set the pulse resolution and phase difference to match your system. Besides, keep cable runs short to preserve signal integrity.
1 × Keyence GT2-71D pulse-output amplifier unit
1 × Power supply cable
1 × DIN-rail mounting clip
1 × Instruction sheet
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Q1: What output signal does the GT2-71D provide?
A: The GT2-71D provides a 90° phase difference differential square wave. It complies with EIA-422 and uses a +5 V line driver.
Q2: What pulse resolution settings are available?
A: You can select 0.1, 0.5, 1, or 10 µm. The factory setting is 0.5 µm.
Q3: Does this unit need a separate power supply?
A: No. Power comes from the main unit, such as the GT2-100N or GT2-100P. The supply range is 10 to 30 VDC.
Q4: How does the GT2-71D mount?
A: It uses a DIN-rail mount. This makes installation simple inside standard control cabinets.
Q5: What is the minimum phase difference range?
A: You can select 0.5, 2.5, 5, or 25 µs. The factory setting is 2.5 µs.
| Brand Name | |
| Model No. | GT2-71D |
| Product Type | Amplifier Unit |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
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