12.2.3.3
SSI encoder
SSI absolute value encoders (Synchronous Serial Interface) generate the angle information via
optical scanning of a code disc (e.g. Gray code). Every (absolute) angle position of the encoder
corresponds to a uniquely identifiable code pattern.
All encoders that use the Stegemann SSI protocol are supported:
•
Supported bit rates for SSI communication: 150 ... 1000 kbits
•
Supported data word widths: 1 ... 31 bits (effective)
•
Supported output code of the SSI encoder: Gray or binary
•
Cycle time: 62.5 µs, 125 µs and 250 µs .
•
Encoder supply: U < 12 V, I ≤ 0.25 A
How to parameterise the SSI encoder:
1. Set the supply voltage of the SSI encoder used in
.
2. Set selection "5: SSI encoder" as the encoder type in
3. Set the transmission rate for SSI communication in
.
With the SSI protocol, the permissible transmission rate decreases as the cable lengths
increase. A safe transmission rate must be set according to the length of the encoder cable
used and the electromagnetic interference level.
4. Set the telegram length in
.
The telegram length reflects the number of data bits used for transmission of a complete SSI
data packet.
5. Break the received SSI data word down into partwords and, if necessary, activate data con-
version of Gray into binary code.
Parameter
Address
Name / setting range / [default setting]
Info
0x2C5A:001
Protokoll-Parameter Lastgeber/Leitgeber (SSI): Über-
tragungsrate
150 ... [300] ... 1000 kbps
•
Setting can only be changed if the inverter is inhibi-
ted.
To enable a stable transmission rate, the length of the encoder cable
used and any electromagnetic interference levels must be taken into
account when setting the value.
0x2C5A:002
Protokoll-Parameter Lastgeber/Leitgeber (SSI): Tele-
grammlänge
1 ... [25] ... 31
•
Setting can only be changed if the inverter is inhibi-
ted.
The set value specifies the number of data bits which are transmitted as
a complete SSI data packet.
0x2C5A:003
Protokoll-Parameter Lastgeber/Leitgeber (SSI): Bits/
Umdrehung
1 ... [13] ... 31
•
Setting can only be changed if the inverter is inhibi-
ted.
Resolution of the encoder.
For example, the resolution for the preset value is "13":
2
13
= 8196 (bits/revolution).
0x2C5A:004
Protokoll-Parameter Lastgeber/Leitgeber (SSI): Start-
bit Positionsdaten
0 ... [0] ... 30
•
Setting can only be changed if the inverter is inhibi-
ted.
Indicates the position in the telegram where the position data word
begins.
0x2C5A:005
Protokoll-Parameter Lastgeber/Leitgeber (SSI): Start-
bit Datenpaket 1
0 ... [0] ... 30
•
Setting can only be changed if the inverter is inhibi-
ted.
Indicates the position in the telegram where data packet 1 begins.
0x2C5A:006
Protokoll-Parameter Lastgeber/Leitgeber (SSI): Start-
bit Datenpaket 2
0 ... [0] ... 30
•
Setting can only be changed if the inverter is inhibi-
ted.
Indicates the position in the telegram where data packet 2 begins.
Configuring the feedback system
Second feedback system for the techology application
Encoder settings
220
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