Lika IF52, Руководство пользователя, Страница: 46 / 60

IF52
Linear Out
This is the scaled max. value which needs to be issued to output. In the example
of page 53 (see paragraph “10.2.2 Converting the SSI encoder data to the
parallel output using both scaling and linearisation“) the input source is a 16-bit
SSI encoder that delivers 2
16
information, i.e. 65,536 information. Input data
needs to be converted into a 0 – 10,000 range at output. Thus
Linear In
=
65,536 while
Linear Out
= 10,000.
9.3 SSI specific settings
SSI Low Bit
This register defines the lowest bit (LSB) for evaluation, when the bit blanking
function is used. See “Hint for the use of the bit blanking function” below in this
page.
It must be set to “01” for evaluation of the full encoder range.
SSI High Bit
This register defines the highest bit (MSB) for evaluation, when the bit blanking
function is used. See “Hint for the use of the bit blanking function” below in this
page.
It must be set to the total number of encoder bits for evaluation of the full
encoder range.
EXAMPLE
In the following example a 13-bit encoder is shown with
SSI High Bit
set to 12
and
SSI Low Bit
set to 03, resulting in evaluation of bits 03 to 12 only and
blanking out positions 01, 02 and 13.
Hint for the use of the bit blanking function
Bit blanking results in a different evaluation of the encoder information, thus
you should be fully aware of what happens with the resolution and the number
of registered turns when you use this function.
EXAMPLE
In the following example two different results when blanking out one bit in a
13-bit single-turn encoder are explained.
MAN IF52 I_E 1.1.odt 9 - Parameter settings 46 / 60