Chapter 3. Allen-Bradley 1794-IE8H, 1794-OE8H, FLEX I/O HART Analog Modules
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1
Install Your FLEX I/O Analog Modules
Chapter
3
What This Chapter Contains
Read this chapter to install the input and output analog modules.
For Information On
Before You Install Your Analog Module
Removal and Insertion Under Power
Connect Wiring to the FLEX I/O HART
See Page
Before You Install Your
Analog Module
Before installing your FLEX I/O analog module:
Table 3.1 Steps to Complete Before Installation
You Need To
Verify that the module will be installed in a suitable enclosure
Position the keyswitch on the terminal base
As Described Under
Removal and Insertion Under Power, page
These modules do not receive primary operational power from the backplane. +V and -V dc power must be applied to your module before installation. If power is not applied, the module position will appear to the adapter as an empty slot in your chassis.
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3-2 Install Your FLEX I/O Analog Modules
Removal and Insertion
Under Power
WARNING
These module are designed so you can remove and insert them under power. However, take special care when removing or inserting these modules in an active process. I/O attached to any module being removed or inserted can change states due to its input/output signal changing conditions.
If you insert or remove the terminal base while backplane power is on, an electrical arc can occur. This could cause an explosion in hazardous location installations.
Be sure that power is removed or the area is nonhazardous before proceeding.
Install the Module
WARNING
When used in a class I, division 2, hazardous location, this equipment must be mounted in a suitable enclosure with proper wiring method that complies with the governing electrical codes.
Installation of the analog module consists of the following.
• Mounting the terminal base unit.
• Installing the analog I/O module into the terminal base unit.
• Installing the connecting wiring to the terminal base unit.
If you are installing your module into a terminal base unit that is already installed, proceed to “Mount the Analog Modules on the Terminal Base” on
Do not use the unused terminals on the terminal base unit.
Using the terminals as supporting terminals can result in damage to modules and/or unintended operation of your system.
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Install Your FLEX I/O Analog Modules 3-3
Mount on a DIN Rail
Do not remove or replace a terminal base unit when power is applied. Interruption of the flexbus can result in unintended operation or machine motion.
Install the Terminal Base Unit
1. Remove the cover plug in the male connector of the unit to which you are connecting this terminal base unit.
2. Check to make sure that the 16 pins in the male connector on the adjacent device are straight and in line so that the mating female connector on this terminal base unit will mate correctly.
3. Make certain that the female flexbus connector is fully retracted into the base unit.
4. Position the terminal base over the 35 x 7.5mm DIN rail A
(A-B pt. no. 199-DR1).
A
Position terminal base at a slight angle and hooked over the top of the DIN rail A.
A
41106
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3-4 Install Your FLEX I/O Analog Modules
41107
Slide the terminal base over tight against the adapter (or proceeding terminal base). Make sure the hook on the terminal base slides under the edge of the adapter (or proceeding terminal base) and the flexbus connector is fully retracted.
Do not force the terminal base into the adjacent modules.
Forcing the units together can bend or break the hook and allow the units to separate and break communication over the backplane.
5. Rotate the terminal base onto the DIN rail with the top of the rail hooked under the lip on the rear of the terminal base.
Use caution to make sure that the female flexbus connector does not strike any of the pins in the mating male connector.
41108
Press down on the terminal base unit to lock the terminal base on the DIN rail. If the terminal base does not lock into place, use a screwdriver or similar device to open the locking tab, press down on the terminal base until flush with the DIN rail and release the locking tab to lock the base in place.
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41109
Gently push the flexbus connector into the side of the adapter (or proceeding terminal base) to complete the backplane connection.
1 - Mounting Plate for Adapter
2 - 18 #6 Self-tapping Screws
(2 for the Adapter, and 2 each for up to 8 Modules)
Install Your FLEX I/O Analog Modules 3-5
6. For specific wiring information, refer to the installation instructions for the module you are installing in this terminal base unit.
Terminal assignments are also given later in this chapter, see page 3-8.
7. Repeat the above steps to install the next terminal base unit.
8. Be sure the flexbus connector cover on the last terminal base unit is in place.
Mount on a Panel or Wall
Installation of a FLEX I/O system on a wall or panel consists of:
• laying out the drilling points on the wall or panel.
• drilling the pilot holes for the mounting screws.
• mounting the adapter mounting plate.
• installing the terminal base units and securing them to the wall or panel.
If you are installing your module into a terminal base unit that is already
installed, proceed to Mount the Analog Modules on the Terminal Base Unit on page 3-7.
Use the mounting kit Cat. No. 1794-NM1 for panel/wall mounting.
1.4
(35.5)
1
2
Adapter Module
(Not Included)
Terminal Base Unit
(Not Included)
41547
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3-6 Install Your FLEX I/O Analog Modules mm (in.)
50
(2.0)
.83 (21)
35.5
(1.4)
To install the mounting plate on a wall or panel:
1. Lay out the required points on the wall/panel as shown in the drilling dimension drawing.
Drilling Dimensions for Panel/Wall Mounting of FLEX I/O
58.5
(2.3)
35.5
(1.4)
58.5
(2.3)
35.5
(1.4)
40.5
(1.6)
15.6
(0.61)
8
(0.3)
Be careful of metal chips when drilling cable mounting holes. Do not drill holes above a system that has any modules installed.
Cable length approximately 292.1 mm
(11.5 in.) or 901.0 mm
(35.5 in.) from upper connector. Length depends upon cable 0.3 m
(1 ft) or 0.91 m (3 ft).
1
+V
-V
2 3
+V -V
4
40871
2. Drill the necessary holes for the #6 self-tapping mounting screws.
3. Mount the mounting plate (1) for the adapter module using two #6 self-tapping screws (18 included for mounting up to 8 modules and the adapter).
IMPORTANT
Make certain that the mounting plate is properly grounded to the panel. Refer to Industrial Automation Wiring and Grounding
Guidelines, publication 1770-4.1.
4. Hold the adapter (2) at a slight angle and engage the top of the mounting plate in the indention on the rear of the adapter module.
5. Press the adapter down flush with the panel until the locking lever locks.
6. Position the terminal base unit up against the adapter and push the female bus connector into the adapter.
7. Secure to the wall with two #6 self-tapping screws.
8. Repeat for each remaining terminal base unit.
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Install Your FLEX I/O Analog Modules 3-7
Mount the Analog Modules on the Terminal Base Unit
The HART analog input and output modules mounts on a 1794-TB3g or
1794-TB3GS terminal base unit.
1. Rotate keyswitch (1) on terminal base unit (2) clockwise to position 3 for the 1794-IE8H or position 4 for the 1794-OE8H as required for each type of module.
Do not change the position of the keyswitch after wiring the terminal base unit.
7
3 1
8
2
6
4
5
40231
Label Under Here or Under Here
2. Make certain the flexbus connector (3) is pushed all the way to the left to connect with the neighboring terminal base/adapter.
You cannot install the module unless the connector is fully extended.
3. Make sure the pins on the bottom of the module are straight so they will align properly with the connector in the terminal base unit.
4. Position the module (4) with its alignment bar (5) aligned with the groove (6) on the terminal base.
5. Press firmly and evenly to seat the module in the terminal base unit.
The module is seated when the latching mechanism (7) is locked into the module.
6. Remove cap plug (8) and attach another terminal base unit to the right of this terminal base unit if required.
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3-8 Install Your FLEX I/O Analog Modules
Make sure the last terminal base has the cap plug (8) in place.
41307
The adapter is capable of addressing eight modules. Do not exceed a maximum of eight terminal base units in your system.
Wire the Terminal Base
Units
Connect Wiring to the
FLEX I/O HART Analog
Modules
Wiring the FLEX I/O HART analog input modules is done using the
1794-TB3G or the 1794-TB3GS terminal base unit..
The FLEX I/O analog modules do not receive primary operational power from the backplane. +24V dc power must be applied to your module before operation. If power is not applied, the module position will appear to the adapter as an empty slot in your chassis. If the adapter does not recognize your module after installation is completed, cycle power to the adapter.
Inputs/Outputs
Each 1794-IE8H input can be operated from an analog field device signal, and each 1794-OE8H output channel can operate an analog field device.
The channels of the 1794-IE8H are electrically connected to each other and have a common plus-line. The channels of the 1794-OE8H are electrically connected to each other.
IMPORTANT
When interconnecting several lines, you must consider the total accumulated power.
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Install Your FLEX I/O Analog Modules 3-9
Connections for the 1794-IE8H HART Analog Input Module on a
1794-TB3G Terminal Base Unit
Flexbus Bus uC
91 Ω
17V
+V
-V
+
4 to 20mA
Xmit
4 to 20mA
Xmit
I
P
I
P
Sig
22 Ω
-
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
+
_
+
_
+
_
+
16
Ch0 Ch1 Ch2 Ch3
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
_
A
Chassis
Ground
+
_
+
_
+
_
+
_
34
Ch4 Ch5 Ch6 Ch7
35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
Chassis
Ground
B
+V -V (COM) NC
24C dc
Supply In
Chassis Grounds for Shields
NC +V -V (COM)
24C dc
Supply Out
C
+V = +24V dc = Terminals C-34 and C-50
-V = COM = C-35 and C-51
Chassis Ground = Terminals B-16, B-33, C-38, C-40…45, and C-47
NC = No connection
For daisy-chaining: Supply in - C-34 (+) and C-35 (-)
Supply out - C-50 (+) and C-51 (-)
(1794-TB3G shown)
40072
40071
For Two-wire Transmitter Devices
1. Connect the individual input wiring to (+) terminals (0, 4, 8, 12) on the 0 to 15 row (A) and on the 16 to 33 row (B) (terminals 17, 21, 25, 29) as indicated in the table below.
2. Connect the associated input to the corresponding (sig) terminal (1, 5, 9,
13) on the 0 to 15 row (A), and on the 16 to 33 row (B) (terminals 18,
22, 26, 30) for each input as indicated in the table below.
3. Connect +V dc power to terminal 34 on the 34 to 51 row (C).
4. Connect -V to terminal 35 on the 34 to 51 row (C).
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3-10 Install Your FLEX I/O Analog Modules
5. If continuing power to the next terminal base unit, connect a jumper from terminal 50 (+V dc) on this base unit to +V dc power terminal on the next terminal base unit.
6. If continuing common to the next terminal base unit, connect a jumper from terminal 51 (-V common) on this base unit to the -V common terminal on the next terminal base unit.
Table 3.2 Wiring Connections for the 1794-IE8H HART Analog Input Module
Input
Input 0
Input 1
Input 2
Input 3
+V
-V
Input
Source
A-0
A-4
A-8
A-12
Input
Signal
A-1
A-5
A-9
A-13
Input
Return
A-2
A-6
Input
Input 4
Input 5
Input
Source
B-17
B-21
A-10
A-14
Input 6
Input 7
B-25
B-29
Terminals 34 and 50
Terminals 35 and 51
Terminals 16, 33, 40, 41, 42, 43, 44, and 45 are connected to chassis ground.
Input
Signal
B-18
B-22
B-26
B-30
Input
Return
B-19
B-23
B-27
B-31
Do not use the unused terminals on the terminal base unit.
Using these terminals as supporting terminals can result in damage to the module and/or unintended operation of your system.
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Install Your FLEX I/O Analog Modules 3-11
Connections for the 1794-OE8H HART Analog Output Module on a
1794-TB3G or 1794-TB3GS Terminal Base Unit
Flexbus
250
Ω
Bus uC
21.6V
HART
Modem
45 Ω
+V
-V
Power
Supply
+
I
F
-
4 to 20 mA
Actuator
4 to 20 mA
Valve
41441
1794-OE8H Module
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
+
_
+
_
+
_
+
16
Ch0 Ch1 Ch2 Ch3
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
_
A
Chassis
+
Ground
_
+
_
+
_
+
_
34
Ch4 Ch5 Ch6 Ch7
35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
Chassis
Ground
B
+V -V (COM) NC
24C dc
Supply In
Chassis Grounds for Shields
NC +V -V (COM)
24C dc
Supply Out
C
+V = +24V dc = Terminals C-34 and C-50
-V = COM = C-35 and C-51
Chassis Ground = Terminals B-16, B-33, C-38, C-40…45, and C-47
NC = No connection
For daisy-chaining: Supply in - C-34 (+) and C-35 (-)
Supply out - C-50 (+) and C-51 (-)
(1794-TB3G shown)
41440
1. Connect the individual output wiring to (+) terminals (0, 4, 8, 12) on the
0 to 15 row (A) and on the 16 to 33 row (B) (terminals 17, 21, 25, 29) as indicated in the table below.
2. Connect the associated output to the corresponding (-) terminal (1, 5, 9,
13) on the 0 to 15 row (A), and on the 16-33 row (B) (terminals 18, 22,
26, 30) for each input as indicated in the following table.
3. Connect +V dc power to terminal 34 on the 34 to 51 row (C).
4. Connect -V to terminal 35 on the 34 to 51 row (C).
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3-12 Install Your FLEX I/O Analog Modules
5. If continuing power to the next terminal base unit, connect a jumper from terminal 50 (+V dc) on this base unit to +V dc power terminal on the next terminal base unit.
6. If continuing common to the next terminal base unit, connect a jumper from terminal 51 (-V common) on this base unit to the -V common terminal on the next terminal base unit.
Table 3.3 Wiring connections for the 1794-OE8H Module
Output Output + Output – Output Output + Output –
Output 0 A-0 A-1 Output 4 B-17 B-18
Output 1
Output 2
A-4
A-8
Output 3 A-12
+V
-V
A-5
A-9
A-13
Output 5
Output 6
B-21
B-25
Output 7 B-29
Terminals 34 and 50
Terminals 35 and 51
B-22
B-26
B-30
Terminals 16, 33, 40, 41, 42, 43, 44, and 45 are connected to chassis ground.
Do not use the unused terminals on the terminal base unit.
Using these terminals as supporting terminals can result in damage to the module and/or unintended operation of your system.
Ground the Module
All I/O wiring must use shielded wire. Shields must be terminated external to the module, such as bus bars and shield-terminating feed throughs.
30820
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Chapter Summary
Install Your FLEX I/O Analog Modules 3-13
In this chapter, we told you how to install your input module in an existing programmable controller system and how to wire to the terminal base units.
Move to chapter 4 to learn about input, output and configuration files for the
HART analog I/O modules on the ControlNet network.
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3-14 Install Your FLEX I/O Analog Modules
Publication 1794-UM063A-EN-P - March 2006

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