User manual

Chapter 7 Data Format
7-3
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Single Transfer Data Format
A 1731 or 1741 module can be configured to transmit its position and tachometer
information with single transfers by setting its Transfer Type parameter to single transfer and
its Single Transfer Length parameter to either 16 or 32 bits.
When configured for 16 bit transfers, only the position data is available. When configured
for 32 bit transfers, both the position and tachometer data is available. The data is always
transmitted in binary format.
E* Error bit. When there is a transducer or
nvRAM fault, the module transmits 8000h
(1000 0000 0000 0000b) in place of
position and tachometer data. This is the
only time the most significant bit of a
position data word is set. If the error is a
transducer fault, only the words of the
faulted channel are changed. If the error is
a nvRAM fault, all of the data words are
changed.
32 Bit Transfer
Word 1
Word 2
Transducer 1 Position ValueE*
Transducer 1 Tachometer ValueE*
16 Bit Transfer
Word 1
Transducer 1 Position ValueE*
Figure 7.3 Single Transfer Data Format