Allen-Bradley 1794-IE8H Spécifications télécharger pdf (Page 112)

Publication 1794-SG002D-EN-P - May 2012

104 Select a FLEX Ex I/O Terminal Base Unit

Wiring when total module current draw is greater than 8.5 W

Combination Daisy-chaining and Separate Power Supplies.

Separate power supply can be brought in on the last module in the chain if

necessary. Make sure you do not jumper to the adapter if using this method.

Use this method when the total current draw through terminal base units is

greater than 8.5 W.

+V, -V

<8.5 W

+V, -V

<8.5 W

1 2 ... 107 108 109 110 111 112 113 114 115 116 117 ... 135 136

Bulletin 1794 and 1797 1
1794-SG002D-EN-P 1
Important User Information 2
Table of Contents 3
Table of Contents v 5
Section 3.1 6
Section 4.1 6
Summary of Changes 7
New and Updated 7
Information 7
1794 FLEX I/O Overview 9
General FLEX I/O and 11
FLEX I/O XT Specifications 11
1794 FLEX I/O XT Overview 11
Specify a FLEX I/O or 13
FLEX I/O XT System 13
Step 1 – Select: 15
CIP Network Infrastructure 15
Select a Network 16
Device-Level Ring Topology 17
ControlNet Network 18
DeviceNet Network 19
DNet In DNet Out 20
Other Network Communication 21
Other Networks – PROFIBUS DP 22
Select FLEX I/O Modules 23
Digital I/O Module Summary 24
Digital Modules 26
Derating Curve 27
Modules Specifications 28
1794-IM8 Derating Curve 29
Digital AC Output Comparison 29
1794-OM8 Derating Curve 31
Digital DC Input Comparison 31
1794-IB32 Derating Curve 33
1794-IC16 Derating Curve 33
Digital DC Output Comparison 34
1794-OB16P Derating Curve 36
Surge Current — A 37
1794-IB16D Derating Curves 39
FLEX I/O Analog 43
Thermocouple and RTD 43
Analog I/O Module Summary 44
Analog 12 Input Module 47
IMPORTANT 48
Isolated Analog Input Modules 48
1794-IR8 RTD Input Module 51
1794-IR8 Derating Curve 52
Thermocouple/mV Input Module 54
= Safe operating area 55
Combination Modules 57
Analog Combination Module 58
Analog Output Comparison 59
Analog 4 Input Modules 60
Analog 12 Output Module 62
FLEX I/O Counter Modules 66
24V DC Input Frequency Module 68
2 Input Pulse Counter Module 71
4 Input Pulse Counter Module 72
1794-PS3 AC/DC 77
1794-PS13 AC/DC 77
About the FLEX Ex I/O Systems 79
FLEX Ex Typical 81
Configurations 81
Entity-Based Architecture 83
Hazardous Area 83
Designation 83
Specify a FLEX Ex System 86
1797-BCNR Coax Barrier Module 90
Select FLEX Ex I/O Modules 95
(1) 1 ms default selectable 97
(2) 1 ms default selectable 97
Analog Modules 99
Module Specifications 100
Input Module 102
HART Interface Modules 103
FLEX Ex I/O Analog 104
Output Modules 104
Counter I/O Module 106
Step 3 – Select: 111
Terminal Base Wiring 111
Diagrams 111
Step 4 – Select: 113
E Type Power Supply 114
N Type Power Supply 114
Understanding System Planning 114
Assigning Power Supplies 116
Hardened conduit 117
Type of Power Input 118
Mount the FLEX System 121
Select Optional Accessories 123
1492-EA35 DIN Rail Locks 124
1794-LBL FLEX I/O Label Kit 124
1794-CJC2 124
Step 5 – Select: 125
ControlNet Ex Taps 126
1786-RG6 Coax Trunk Cable 127
Related Documentation 129
FLEX Ex I/O 133
For More Information 133
Rockwell Automation Support 136
Documentation Feedback 136

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