Function description
Operating Manual PSSu E S ABS SSI(-T)
21441-EN-05
12
4
Function description
4.1
Block diagram
Module Bus
Periphery
Supply
+ 24 V DC
Module
Supply
+ 5 V DC
Data
(ST)
Data
11 14
21
24
Clock
4.2
Module features
4.2.1
Functions
Module supply
}
The module supply provides the module with voltage.
Periphery supply
}
The supply for the test pulse output is generated from the periphery supply. It is galvan-
ically isolated from the periphery supply.
As part of each cycle the module sends a pulse sequence at the test pulse output (Cl) to
the SSI absolute encoder. In turn the encoder transmits its position data. The position data
is read in at the module's input (D) (see timing diagram: SSI data transfer).
With the system software the user can set the following values to adapt the module to the
encoder or higher level control system:
}
Transmission rate
The frequency of the pulses at the test pulse output (Cl) determines the transmission
rate. The user can adapt the frequency to the encoder in a range from 62.5 kHz up to
1.5 MHz (see Technical Details).
}
Input data length:
The module's input data length must be adjusted to the data length of the absolute en-
coder.
The module can process up to 32 Bits. The default is 24 Bits.
