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Absolute SSI communications only encoder
Device Type
SSI (5) for an SSI communications only encoder
(2x.038)
SSI Binary Mode
Off (0) = Gray Code
(2x.048)
On (1) = Binary Mode
Rotary Turns Bits
Set to the number of turns bits for the encoder (this is usually 12 bits for a
(2x.033)
multi-turn SSI encoder)
Comms Bits
Total number of bits of position information for the encoder (this is usually 25
(2x.035)
bits for a multi-turn SSI encoder)
Comms Baud Rate
100 k (0), 200 k (1), 300 k (2), 400 k (3), 500 k (4), 1 M (5), 1.5 M (6),
(2x.037)
2 M (7), 4 M (8)
Error Detection
Level (2x.040)
6.3
Encoder Simulation Output Set-up
The drive supports three modes of encoder simulation output.
•
Hardware mode - Incremental signals (AB, FD)
•
Software mode - Incremental signals (AB, FD, FR)
•
Software mode - Absolute SSI data
The availability of the encoder simulation output is dependent on the type of feedback device
connected to the P1 position interface. Table 5-3 Availability of the P2 position feedback interface
and the encoder simulation output on page 25 for more information on the availability of the
encoder simulation output. The status of the encoder simulation output can be seen in Encoder
Simulation Status (1x.086) as follows:
None (0)
The encoder simulation output is not enabled or is not available
Full (1)
Full encoder simulation with marker output is available
No Marker (2)
Encoder simulation without marker output is available
6.3.1
Hardware mode - Incremental signals (AB, FD)
The hardware mode provides incremental signals derived via hardware from the P1 position
feedback interface on the module/drive with negligible delay. The supported incremental output
signals are AB and FD. Hardware mode only produces an output when the input device connected
to the P1 position interface is AB, FD, FR, SC, SC Hiperface, SC EnDat or SC SSI type devices. It
should be noted that with a SINCOS source device, the output is based on the zero crossings of the
sine wave inputs and does not include interpolation.
SI-Universal Encoder User Guide
Issue: 2
Bit
4
3
2
1
0
X
X
1
X
X Enable SSI power supply alarm bit monitor
X
1
X
X
X Disable trips Comms timeout P2 to SSI Error P2
1
X
X
X
X Disable Setup Changed P2 trip
Description
41
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