Siemens SIMATIC ET 200S Operating Instructions Manual page 252

1SSI
4.8 Setting parameters for the 1SSI
Parameters
Total steps of the
absolute encoder
1
Latch: Encoder value
Comparator 1
Comparator 2
Sign of life
252
Value Range
Encoder type 13 bits: 16 to 8192

Encoder type 14 bits: 16 to 16384

Encoder type 15 bits: 16 to 32768

Encoder type 16 bits: 16 to 65536

Encoder type 17 bits: 16 to 131072

Encoder type 18 bits: 16 to 262144

Encoder type 19 bits: 16 to 524288

Encoder type 20 bits: 16 to 1048576

Encoder type 21 bits: 16 to 2097152

Encoder type 22 bits: 16 to 4194304

Encoder type 23 bits: 16 to 8388608

Encoder type 24 bits: 16 to 16777216

Encoder type 25 bits: 16 to 33554432

Not active / With rising edge DI / With
falling edge DI / With both edges DI
Not active / In the up direction / In the
down direction / In both directions
Not active / In the up direction / In the
down direction / In both directions
Off, On
Note
If you find "Total steps - highword" and "Total steps -
lowword" in your parameter assignment software
instead of "Total steps", the following definition applies:
Total steps = total steps lowword + total steps
highword x 2
16
This parameter is available in the parameter
assignment software in standard mode only.
Not active: The encoder value cannot be frozen.
This parameter is available in the parameter
assignment software in standard mode only.
Not active: The comparator is switched off.
This parameter is available in the parameter
assignment software in standard mode only.
Not active: The comparator is switched off.
This parameter is only active in isochronous mode.
When sign of life is on, the sign-of-life bit is toggled,
i.e., the last sent value is inverted, each time an
encoder value is read in in isochronous mode. If a
reduction is assigned in the "Encoder Sampling Rate"
parameter, the value is toggled only if an encoder
value was actually read in.
You can find the sign-of-life bit in the feedback
interface in:
Byte 4/bit 7 (standard mode)

Byte 0/bit 7 (fast mode)

Operating Instructions, 06/2010, A5E00124867-07
Technological Functions