User manual

Chapter 7 Data Format
7-1
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This chapter outlines the format of the position and tachometer data sent from a 1700
module with either block or single transfers.
Block Transfer Data Format
When a block transfer read instruction accesses a 1700 module, the module transmits two 16
bit words for each transducer channel. If the 1700 module is programmable from the back-
plane, (the PLC Program parameter is set to its program enabled value), one additional word,
the Status Word, is also transmitted. The format of the data is shown in the figure below.
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.
hý1731, 1732, 1733, and 1734 modules
transmit position and tachometer data in
binary or BCD format. The Data Format
parameter sets the format of this data. See
chapter 1, pg. 1-8, Data Format Parameter
for more information on this parameter.
hýThe Status word is only transmitted when
the PLC Program parameter is set to its
program enabled value. See chapter 1,
pg. 1-9, PLC Program Parameter for more
information on this parameter.
1734 / 1744
Word 1
Word 2
Word 3
Word 4
Word 5
Word 6
Word 7
Word 8
Word 9
Status Word
Transducer 1 Position ValueE*
Transducer 2 Position ValueE*
Transducer 3 Position ValueE*
Transducer 4 Position ValueE*
Transducer 1 Tachometer ValueE*
Transducer 2 Tachometer ValueE*
Transducer 3 Tachometer ValueE*
Transducer 4 Tachometer ValueE*
1733 / 1743
Word 1
Word 2
Word 3
Word 4
Word 5
Word 6
Word 7
Status Word
Transducer 1 Position ValueE*
Transducer 2 Position ValueE*
Transducer 3 Position ValueE*
Transducer 1 Tachometer ValueE*
Transducer 2 Tachometer ValueE*
Transducer 3 Tachometer ValueE*
1732 / 1742
Word 1
Word 2
Word 3
Word 4
Word 5
Status Word
Transducer 1 Position ValueE*
Transducer 2 Position ValueE*
Transducer 1 Tachometer ValueE*
Transducer 2 Tachometer ValueE*
1731 / 1741
Word 1
Word 2
Word 3
Status Word
Transducer 1 Position ValueE*
Transducer 1 Tachometer ValueE*
Figure 7.1 BTR Data Format