Siemens SIMOTION C Operating Instructions Manual page 66

Interfaces
3.7 Possible uses of onboard drive and measuring system interface in the application (C230-2, C240)
Use as counter input on X3 to X6
An available encoder input of an axis channel (e.g. for a speed-controlled axis) can be used
as an input for a 16-bit up/down counter (90-degree pulse train of a connected TTL encoder,
zero pulse not required). The counter value can be accessed by means of an I/O variable.
Configuration procedure in SIMOTION SCOUT:
1. Specification of start address in the hardware configuration.
2. Use of the available encoder input as an additional counter using an incremental
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encoder.
SIMOTION C
Operating Instructions, 02/2012