Jetter JetWeb JX2-CNT1, Руководство пользователя

Страница: 75 / 100

JX2-CNT1 11 SSI Absolute Encoder
Jetter AG 75
11.2 Configuration
Configuration Steps
• Define the clock number and rate using register 3xx6 "SSI Configuration".
• Define the signal coding using virtual ouput xx06 "Signal Coding".
• Define the type of parity using virtual output xx08 "Parity Settings" if a parity bit is
included in the data stream.
• Enable parity check using virtual output xx07 "Enable Parity Check" if a parity bit
is included in the data stream.
• Enable the SSI function using virtual ouput xx04 "Encoder Selection".
11.2.1 Number and Rate of Clocks
The number of clocks and the clock rate is set in register 3xx6 "SSI Configuration".
The number of clocks depends on the position resolution and the output format of the
related SSI encoder. For more information refer to “Reading in SSI data" on page 69.
The clock frequency depends on the length of the encoder cable. For more
information refer to chapter 6.8 "SSI Encoder", page 42.
The value of register 3xx6 (number of clocks and clock rate) is calculated by the
formulas given in the following table. In this table, configuration values for clock rates
of 100 kHz and 200 kHz along with the most common clock numbers are listed:
Register 3xx6: SSI Configuration
Function Description
Read Actual configuration value of the SSI encoder
Write New configuration value of the SSI encoder
Value range 0 = No SSI encoder connected
21.464 ... 65,535 (see below)
Value following reset 0
Note!
Register 3xx6 is automatically set to 0 if the SSI function is not enabled (virtual
output xx04 "Encoder Selection" is not set = dual-channel encoder is enabled)
and values are entered into register 3xx0.