ProSoft Technology 3170-PDP User Manual

Page 30

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

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

Diagnostics

Config. Select

Full Range

Input Size

Output

0 or 1 Word

1 or 6 Words

Read

Write