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Format of Offset Words
17 16 15 14 13 12 11
S
NO. OF ENCODER POSITIONS
The offset words are the last two words of the write-data block that you send
to the absolute encoder module.
If you are controlling
2 outputs
4 outputs
6 outputs
8 outputs
S = sign bit. Set this bit if the offset has a negative value; reset the bit if
the offset has a positive value.
The first offset word contains the value of the offset. Bit 17 of this word
is the sign bit. It indicates whether the offset is negative or positive. Set
bit 17 if the offset is negative; reset it if the offset is positive.
The second offset word is the number of positions of the encoder. If you
are using a 0 to 4,095-position encoder, your second offset word is 4,096.
Block transfer write Data with Offset
The number of words you send to the module depends on the number of
outputs the module controls. The offset feature adds two words to the
total number of words you send to the module:
If the module
You send:
controls:
2 outputs
7 words
4 outputs
12 words
6 outputs
17 words
8 outputs
22 words
If the module is controlling eight outputs, your block-transfer-write data
now looks like this:
Chapter 5
Offset Programming
10 7
6
5
4
3
OFFSET VALUE
The offset words are:
words 6 and 7
words 11 and 12
words 16 and 17
words 21 and 22
2
1
0
Bit #
13523
5 3
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