Encoders
10-4
FM 351 Positioning Module
C79000-G7076-C351-02
10.2 Absolute Encoders
Single-turn and Multiturn Encoders
Absolute encoders are grouped as follows:
• Single-Turn Encoders
Single-turn encoders cover the total measuring range in one encoder revolution.
• Multiturn Encoders
Multiturn encoders cover the measuring range in a number of encoder
revolutions.
Connectable Absolute Encoders
Absolute encoders with a serial interface are supported. Position information is
transferred synchronously using the SSI protocol (synchronous serial interface).
The FM 351 supports only GRAY code. Due to the arrangement of the data bits in
the transferred frames, the data formats 25-bit (“fir tree”), and 13-bit (“half fir tree”)
are used.
Encoder Type
Frame Length
Single-turn
Single-turn
Multiturn
13 bits
25 bits
25 bits
Data Transfer
The baud rate for the data transfer depends on the cord length (see Appendix A,
Technical Specifications).
Pulse Evaluation with Absolute Encoders
1 Inkrement (Gebervorgabe) 1 Impuls (FM–Auswertung)
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