OCD-PPA1G-0412-B120-CRW Parallel Encoder with Multiturn Bit Mapping

For OCD-PPA1G-0412-B120-CRW, EncoderWorks can provide a custom compatible replacement solution for bit-parallel multiturn absolute feedback systems where the key checks are bit-line mapping, latch timing, DIR logic, and ø12 mm blind-hollow shaft fit. This model must not be treated as a simple 12-bit singleturn encoder, because the controller may also read multiturn position through additional parallel lines. Typical production lead time: 15 working days.

This encoder is used where a PLC input card, counter module, or legacy controller reads absolute position through individual digital conductors instead of SSI, CANopen, or Profibus. Replacement work must verify the complete bit structure, not only the bore and cable type. The push-pull output level, Gray-code reading, 12-bit singleturn value, 4-bit multiturn value, latch behavior, direction input, radial cable exit, and blind-hollow shaft engagement must all match the existing control system.

System Limits

The main electrical limit is multiturn parallel mapping. Each position bit must be connected to the correct controller input, including both singleturn and multiturn lines. If a multiturn bit is swapped or ignored, the encoder may look correct within one revolution but fail after the shaft crosses a turn boundary.

Latch timing is the second failure boundary. If the PLC samples the parallel lines while the shaft is crossing a transition point, it may capture a false value. This is more serious on multiturn feedback because an error near a turn transition can affect the controller’s absolute travel position, not only the angle inside one revolution.

The mechanical limit is the ø12 mm blind-hollow shaft interface. The bore, 30 mm shaft depth, and ø58 mm flange must be installed without radial preload or dynamic misalignment. Shielding and cable routing should also be reviewed because parallel conductors are sensitive to noise from inverter, motor, brake, or solenoid wiring.

Wiring & Installation

Before removing the existing encoder, record the full cable assignment for Bit 1 through Bit 16, Latch, DIR, supply, and GND. The replacement should be wired channel by channel instead of by assumed color order.

After wiring, rotate the shaft slowly and confirm that the controller value changes smoothly in the expected direction. Then check the multiturn count across more than one revolution. If the application uses travel limits, indexing stops, or position-based interlocks, verify those switching points again after mechanical zero alignment.

Custom Compatible Solution

EncoderWorks can configure the replacement around the installed machine requirements:

• Match bit-parallel output, push-pull voltage level, Gray-code reading, and controller input mapping
• Verify 12-bit singleturn and 4-bit multiturn value behavior before shipment
• Adapt the ø58 mm blind-hollow flange, ø12 mm bore, radial cable exit, and 1 m cable length
• Review latch, DIR, shielding, grounding, and blind-hollow shaft load for stable operation

Key Data