Siemens S7-300 - 8.6 SM 326; DO 10 x DC 24 V;2 A (6 ES7326-2 BF01-0 AB0)

Encoders
11.3 Absolute encoder
FM 352 electronic cam controller
Operating Instructions, 05/2011, A5E01071724-03
141
11.3 Absolute encoder
Single-turn and multiturn encoders
Absolute encoders are divided into the categories:
● Single-turn encoder
The total range of single-turn encoders is scale to one revolution.
● Multiturn encoder
The total range of multiturn encoders is scaled to several revolutions.
Supported absolute encoders
Absolute encoders with serial interface. Position data are transferred synchronously using
the SSI protocol (SynchronousSerialInterface). FM 352 only supports GRAY code. Due to
the arrangement of the data bits in the transferred frames, the data formats "fir tree", "half fir
tree" and "right-justified" are used.
Encoder type Frame length / type
Single-turn encoder
Single-turn encoder
Single-turn encoder
Multiturn encoder
Multiturn encoder
Listen in
Listen in
13-bit half fir tree
13-bit right-justified
25-bit right-justified
25-bit fir tree
25-bit right-justified
Fir tree
Right-justified
Special setting:
Multiturn encoder in single-turn mode 25-bit half fir tree
Data transfer
The data rate for data transmission depends on the cable length (see chapter "Technical
data (Page 166)").
Pulse evaluation with absolute encoders
1 increment (encoder default) = 1 pulse (FM evaluation)