7 EtherCAT communication
7.8 Parameterising the encoder evaluation
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Lenze · I/O system 1000 · Reference Manual · DMS 5.0 EN · 09/2016 · TD17
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07 Bit 1 ... 0: Ready for operation
During "Monitoring operation" the module serves to monitor the
data exchange between an SSI master and an SSI encoder. It
receives the cycle by the master and the data flow by the SSI
encoder.
In the "Master mode" operating mode the module provides a
cycle to the encoder and receives data by the encoder.
0b01 = monitoring operation
0b10 = master mode
Bit 2: Shifting direction
Specify the orientation of the encoder data here. More
information can be found in the data sheet for your encoder.
Usually, the SSI encoder uses "MSB first".
0 = LSB first (LSB is transmitted first)
1 = MSB first (MSB is transmitted first)
Bit 3: Edge clock signal
Here you can specify the edge type of the clock signal, in the case
of which the encoder supplies data. Information on this can be
found in the data sheet for your encoder. Usually the SSI
encoders respond to rising edges.
0 = falling edge
1 = rising edge
Master mode: Connect clock output signal (ClockOut) to the
EPM-S604.
Monitoring mode: Connect clock input signal (ClockIn) to the
EPM-S604.
Bit 4: Coding
In the "Binary code" setting, the provided encoder value remains
unchanged. In the "Gray code" setting, the Gray-coded value
provided by the encoder is converted into a binary value. Only
after this conversion, the received encoder value is scaled, if
required. The Gray code is another form of representation of the
binary code. It is based on the fact that two adjacent Gray
numbers differ from each other in exactly one bit. If the Gray
code is used, transmission errors can be easily detected, since
adjacent characters must only differ from each other in one digit.
Information on this can be found in the data sheet for your
encoder.
0 = standard code
1 = Gray code
Bit 7 ... 5: Reserved
0x1E
08 Reserved
09 SSI function By enabling the SSI function the module starts with the cycle
output and the evaluation of the encoder data. In the "monitor
operation" mode, the module starts with the encoder
evaluation.
0 (0x00) = inhibited
1 (0x01) = enabled
0x00
Subindex Name Description/value Lenze
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