ES950 CONFIGURATION AND OPERATING MODES. Enertronica Santerno Sinus Penta, SOLARDRIVE PLUS, IRIS BLUE, PENTA MARINE

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18.3. ES950 Configuration and Operating Modes

The ES950 encoder interface board may power both 5V to 24V encoders and allows absolute encoders readout via two different protocols based on the same types of signals: one data line and one clock line.

1

2

BiSS mode

EnDat mode

Biss Encoder (differential lines DATA+/ DATA –, TCLK+/ TCLK–)

EnDat Encoder (differential lines DATA+/ DATA –, TCLK+/ TCLK–)

The figure shows the block diagram of the ES950 board for encoder interfacing (independently of whether using the Biss or EnDat protocol) and for interfacing with the control board. The figure also shows the acquisition logics for the digital lines from/to the field and the interface with external incremental encoders (if any).

Figure 161: Block diagram for ES950 board interface

BiSS/EnDat absolute encoders are power supplied via the ES950 board according to their own specifications. Power supply is isolated in respect to the control logics. BiSS/EnDat absolute encoders interface with a Master implemented on FPGA controlling the different protocols to send absolute position information to the control board via parallel interface.

Through the FPGA Master via parallel interface, the control board may read/write additional information internally to the encoder.

The states of the opto-isolated digital inputs/outputs can be accessed via parallel interface as well, whereas the incremental lines coming from the relevant encoder, even if going through the FPGA Master, reach the control board via dedicated lines.

The ES950 board also features an error detecting mechanism for the signals sent from the incremental encoder.

Dedicated outputs make it possible to repeat the acquired encoder signals possibly applying a frequency divider by 2, 4, 8.

The protocol is chosen by programming the board (in off-line mode) accordingly and by setting proper parameters in the control board software.

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