GXP2W.A40B1A2 SSI Timing and Clamping Flange

For GXP2W.A40B1A2, EncoderWorks can provide a custom compatible replacement focused on SSI clock/data timing, radial M23 pin mapping, and Ø10 mm IP65 clamping-flange alignment. This model should not be treated as a normal multiturn absolute encoder exchange. The encoder may output valid SSI data, while the controller still reads the wrong position because code format, UP/DOWN direction, preset behavior, programmed resolution, or shaft coupling was not reproduced.

The GXP2W.A40B1A2 is an SSI multiturn absolute encoder with optical sensing, 13-bit singleturn resolution, 12-bit multiturn range, 8192 steps per turn, 4096 turns, 10–30 VDC supply, SSI RS485 data line driver, RS232 programming interface, Ø58 mm housing, Ø10 mm clamping flange, IP65 shaft-seal execution, and B1 radial M23 16-pin connector.

The first failure boundary is SSI timing. The receiving controller must match the encoder’s SSI clock frequency, clock interval, monoflop timing, and Data+/Data- differential pair behavior. If the clock is too fast, the cable is poorly paired, or the receiver samples outside the valid timing window, the position word can become unstable even when the encoder itself is healthy.

This replacement fails when SSI communication is active, but the PLC reads intermittent or shifted position values because Clock+/Clock-, Data+/Data-, clock frequency, or cable pairing does not match the original installation. That is a signal-timing failure, not an optical sensing failure.

The second boundary is programmed data behavior. The encoder supports programmable total resolution, rotating direction, code selection, preset, offset, and zero-point setting. If the original unit used Gray code and the replacement is read as binary, or if UP/DOWN direction is different, the machine can receive a stable but wrong absolute position.

Preset input must also be controlled. It is triggered by a high impulse and should match the selected rotating direction. A wrong preset operation can move the electrical zero point without any mechanical change. Unused control inputs should not be left in an undefined state.

Mechanically, the A shaft option means Ø10 mm clamping flange with IP65 protection. The coupling must be centered before tightening, and the axial/radial shaft-load limits should be treated as boundaries, not normal preload. The radial B1 M23 connector also needs enough clearance so cable strain does not disturb shielding or coupling alignment.

The replacement decision should first confirm Ø10 mm clamping-flange geometry, IP65 shaft-seal requirement, B1 radial M23 pin assignment, SSI Clock+/Clock- and Data+/Data- pairing, 13-bit singleturn and 12-bit multiturn mapping, Gray/binary code setting, UP/DOWN direction, preset behavior, RS232 programmed parameters, supply voltage, shielding, and coupling load. EncoderWorks treats GXP2W.A40B1A2 as an industrial encoder custom compatible solution where SSI timing and clamping-flange mechanics decide field reliability.

Typical production lead time: 15 working days.

Key Data