ProSoft Technology 3170-PDP - Manual (Page 25)

How Communication Takes Place and I/O Image Table Mapping 3170-PDP ♦ FLEX Platform
FLEX I/O™ PROFIBUS Adapter
ProSoft Technology, Inc. Page 25 of 152
August 23, 2007
3.2.3 1794-IB8S – 8-point Discrete Sensor Input Module Image Table
Mapping
Module Image
Inputs
Delay
Time
Status
I/O Image
Not used
Not used
Input Size
Output Size
0 or 1 Word
1 or 2 Words
Delay
Time
Read
Write
1794-IB8S Memory Map
Decimal
Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 Size
Octal Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 Read Words
S7 S6 S5 S4 S3 S2 S1 S0 D7 D6 D5 D4 D3 D2 D1 D0 Read Word 1
Not used Read Word 2
Not used DT 12 to 15 DT 00 to 11 Write Word 1
Where S = Status of input (where S1 corresponds to the diagnostic bit for input 1, S2 corresponds
to the diagnostic bit for input 2, etc.)
D = Input Data (where D0 corresponds to input 0, D1 corresponds to input 1, etc.
DT = Input Delay Time (where DT 00 to 11 corresponds to inputs 0 thru 11; DT 12 to 15
corresponds to inputs 12 thru 15.
The delay time for 00 to 11 must be the same as the delay time for 12 to 15.
Smart Sensor
Bits
08 to 15 S = Diagnostic data – 1 = Fault present
(Smart)
0 = Normal (no errors) Bits
00 to
07 D = Input data 1 = Sensor on
0 = Sensor off
Standard Sensor
Bits
08 to 15
S = Diagnostic data – 1 = Diagnostics not
disabled
0 = Normal (Disabled) Bits
00 to
07 D = Input data 1 = Sensor on
0 = Sensor off
1794-IB8S Input Delay Times
Bits Description Selected Delay Time
02 01 00 Delay Time for Inputs 00 to 11
05 04 03 Delay Time for Inputs 12 to 15
0 0 0 Delay Time 0 (default) 512µs
0 0 1 Delay Time 1 1ms
0 1 0 Delay Time 2 2ms
0 1 1 Delay Time 3 4ms
1 0 0 Delay Time 4 8ms
1 0 1 Delay Time 5 16ms
1 1 0 Delay Time 6 32ms
1 1 1 Delay Time 7 64ms