Siemens Sinamics V90 Operating Instructions Manual page 155

Fast pulse train input position control (Fast PTI)
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SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 04/2019, A5E36037884-007
The resistor R3 (200 Ohm to 500 Ohm) is required only if the speed for searching the
zero position exceeds 300 rpm.
The resistor R (200 Ohm to 500 Ohm, recommended power ≥ 5 W ) is required only if
the PTI input frequency exceeds 100 KHz.
Connecting
4.3 Control/status interface - X8
153