3170-PDP
♦
FLEX Platform
How Communication Takes Place and I/O Image Table Mapping
FLEX I/O™ PROFIBUS Adapter
Page 30 of 152
ProSoft Technology, Inc.
August 23, 2007
Word Decimal
Bit
Definition
Read Word 8
Bits 00 to 14
Channel 7 analog data – 12-bit left justified two's
complement number; unused lower bits are zero; 4 to 20mA
uses all 16 bits.
Bits 15
Channel 7 analog data sign bit.
Read Word 9
Bits 00 to 07
Underrange bits (U) for individual channels (4 to 20mA
current input only)- Bit 00 corresponds to input channel 0, bit
01 corresponds to input channel 1, and so on. When set (1),
indicates either a broken or open input wire, or input current
below 4 to 20mA.
Bits 08 to 14
Not used – set to 0.
Bit
15
Power Up bit – included in series B modules only. This bit is
0 in series A modules. This bit is set to 1 when all bits in the
configuration register are 0 (unconfigured state). The
configuration register can be cleared by either of the reset
inputs, or by the user writing all zeroes to it.
Write Word 1
Bits 00 to 07
Full range bits (F) for individual channels – Bit 00
corresponds to input channel 0, bit 01 corresponds to input
channel 1, and so on. Refer to range selection above.
Bits 08 to 15
Configure select bits (C) for individual channels – Bit 08
corresponds to input channel 0, bit 09 corresponds to input
channel 1, and so on. Refer to range selection above.
Write Word 2
Bits 00 to 15
Not used – set to 0.
Write Word 3
Bits 00 to 15
Not used – set to 0.
Write Word 4
Bits 00 to 15
Not used – set to 0.
Write Word 5
Bits 00 to 15
Not used – set to 0.
Write Word 6
Bits 00 to 15
Not used – set to 0.
3.2.8 1794-OE4 – 4 Output Analog Module Image Table Mapping
Module Image
I/O Image
Analog Data Channel 0
Analog Data Channel 1
Analog Data Channel 2
Analog Data Channel 3
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Diagnostics
Config. Select
Full Range
Input Size
Output
0 or 1 Word
1 or 6 Words
Read
Write
OE
PU
