Rockwell-automation 1794-APB/B FLEX I/O PROFIBUS Adapter Module User M Manual de usuario Pagina 21
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Chapter
2
( '#" * #)!%
How Communication Takes
Place and I/O Image Table
Mapping
In this chapter, you will learn about:
• communication over the FLEX I/O backplane (between the
PROFIBUS adapter and the I/O modules)
• how data is mapped into the I/O image table
One 1794-APB PROFIBUS adapter can interface with up to eight
terminal base units with installed FLEX I/O modules, forming a
FLEX I/O system of up to eight slots. The adapter communicates to
other network system components over the PROFIBUS network.
The adapter communicates with its I/O modules over the backplane.
"$('&
''(&
('$('&
#"(%'#"
Slot 1
I/O Module
#%&
%'
#%&
%'
$'%
"$('&
''(&
('$('&
#"(%'#"
Slot 2
I/O Module
"$('&
''(&
('$('&
#"(%'#"
Slot 8
I/O Module
Network
The I/O map for a module is divided into read words and write
words. Read words consist of input and status words, and write
words consist of output and configuration words. The number of
read words or write words can be 0 or more. The length of each I/O
module’s read words and write words vary in size depending on
module complexity. Each I/O module will support at least 1 input
word or 1 output word. Status and configuration are optional,
depending on the module.
What this Chapter Contains
Communication Over
the I/O Backplane
- 1
- ! 1
- #" 1
- Important User Information 2
- 5
- Related Publications 6
- Conventions 7
- About this User ManualP–4 8
- Table of Contents 9
- Table of Contents 10
- Connect the Adapter to the 11
- PROFIBUS DP Network 11
- Configure the Adapter for 11
- Master/SlaveCommunication 11
- Glossary 12
- Troubleshooting 12
- Specifications 12
- Device Data Base File 12
- Hazardous Locations 12
- Overview of FLEX I/O and Your 13
- PROFIBUS Adapter Module 13
- Mount and Remove your 14
- System Easily 14
- Optional Accessories 14
- Mounting Kit (1794ĆNM1) 15
- Mounting Dimensions 16
- Purpose of the 1794ĆAPB 17
- FLEX I/O Adapter 17
- PROFIBUS Adapter 18
- Components 18
- Network Connector 19
- Power Wiring 19
- How Communication Takes 21
- Place and I/O Image Table 21
- Polled I/O Structure 22
- Adapter Input Status Word 23
- Mapping Data into 24
- Module Image 25
- I/O Image 25
- 1794ĆIB8 Memory Map 25
- 1794ĆIB8 Input Filter Times 25
- 1794ĆIB16 Memory Map 26
- 1794ĆIB16 Input Delay Times 26
- 1794ĆOB8 Memory Map 27
- 1794ĆOB16 Memory Map 27
- " ) &(,+ + 28
- &(,+ !#$+ ) #% 28
- 1794ĆOV16 29
- 1794ĆIB8S Memory Map 30
- 1794ĆIB8S Input Delay Times 30
- 32/32 )"--&+ 31
- 1794ĆIA8 Memory Map 32
- 1794ĆIA8 Input Filter Times 32
- 1794ĆOA8 Memory Map 33
- 1794ĆOW8 Memory Map 33
- 1)) . +&$ !(0 34
- 5-- 2#/)' $+4 35
- 1794ĆOE4 Memory Map 37
- 6.. 3#0)' $+5 38
- 1794ĆIE4XOE2 Memory Map 40
- 21),*74( 5(/(&6 %,6 41
- 7// 4$1*( %,6 41
- -#2*$ 1 5.$ 43
- Reserved 47
- 1794ĆIT8 Read and Write Words 47
- for each channel 51
- Input Module 52
- Setting the Input Filter 59
- Output Module 65
- Table Mapping 68
- Word 8 Not Used 69
- Setting the Input Filters 70
- Table 2.A 71
- 1, ,!!2/ 73
- Pulse Counter Module 75
- (1794-IP4) 80
- Defaults 85
- Cabling and Equipment 88
- Required for Line A Type 88
- Required for Line B Type 89
- Terminate the Network 91
- Master/Slave Communication 93
- Entering User Parameter 94
- • auto configure 95
- • STATUS LED flashes red/off 96
- FLEX I/O modules 97
- Entering Check 100
- Configuration Data 100
- Read Configuration 102
- Response Data 102
- 103
- Viewing Status from the 104
- Master's Configuration 104
- Software 104
- 105
- 107
- 109
- Hazardous LocationsC–2 110
- 111
- (8;5.@3./ ;/9;/</7=+=387 124
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