32 Interface module XN-322-2SSI
32.3 Wiring
272
XN300 slice modules
06/16 MN050002 EN
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32.3.2 Gray Decoder Mode
For encoders that deliver Gray encoded data, the result will be automatically
decoded (Gray code decoding ON) and provided as a 32-bit value in the chan-
nel's relevant data register. When using this mode, extra bits in the
encoder's data stream must be taken into account. If there are any extra bits
that are not encoded and are transmitted before the encoded measurement
data in the serial data stream, automatic decoding will result in incorrect
decoding. In this case, you should use binary mode instead. If the unencoded
extra bits in the encoder's serial data stream come after the measurement
data instead, only these extra bits will be interpreted incorrectly by automatic
decoding.
32.3.3 Terminal type
A non-volatile shift register with the current measured value is loaded in the
sensor. If a data value needs to be read, the device will output a clock signal
on the clock cable. With this clock signal, the device will read the data from
the encoder's shift register. Absolute encoders will deliver absolute data –
with additional control information if applicable – in the shift register.
Figure 147:
Application Style
Figure 148:
Application Style
a
Clock
b
Data
GND
+5 V
C-
C+
RS422
D+
D-
Bit n
Bit n-1
Bit n-2
Bit 1
Bit 0
1
2
3
①
②
Summary of Contents for XN300
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