2- How to Install Your Incremental Encoder Module. Allen-Bradley FLEX I/O 1794-ID2
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Chapter
2
What This Chapter
Contains
Before You Install Your
Input Module
In this chapter, we tell you about:
For information on See page
Before You Install Your Module . . . . . . . . . . . . . . . . . . . . . . . 2–1
European Union Directives . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2
on a wall/panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6
on the terminal base . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–7
Connecting Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–9
Module Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–14
Before installing your incremental encoder module in the FLEX I/O system:
You need to:
Calculate the power requirements of all modules in each FLEX system.
Position the keyswitch on the terminal base
!
As described under:
Power Requirements, page 2-2
Installing the Module, page 2–4
ATTENTION: The incremental encoder module does not receive power from the backplane. +24V 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.
European Union Directive
Compliance
If this product has the CE mark it is approved for installation within the European Union and EEA regions. It has been designed and tested to meet the following directives.
EMC Directive
This product is tested to meet Council Directive 89/336/EEC
Electromagnetic Compatibility (EMC) and the following standards, in whole or in part, documented in a technical construction file:
•
EN 50081-2EMC – Generic Emission Standard, Part 2 –
Industrial Environment
•
EN 50082-2EMC – Generic Immunity Standard, Part 2 –
Industrial Environment
Allen-Bradley Motors
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How to Install Your Incremental Encoder Module
Low Voltage Directive
This product is tested to meet Council Directive 73/23/EEC
Low Voltage, by applying the safety requirements of EN 61131–2
Programmable Controllers, Part 2 – Equipment Requirements and
Tests.
For specific information required by EN 61131-2, see the appropriate sections in this publication, as well as the following Allen-Bradley publications:
•
Industrial Automation Wiring and Grounding Guidelines For
Noise Immunity, publication 1770-4.1
•
Guidelines for Handling Lithium Batteries, publication AG-5.4
•
Automation Systems Catalog, publication B111
This equipment is classified as open equipment and must be mounted in an enclosure during operation to provide safety protection.
Power Requirements
The wiring of the terminal base unit is determined by the current draw through the terminal base. Make certain that the current draw does not exceed 10A.
!
ATTENTION: Total current draw through the terminal base unit is limited to 10A. Separate power connections may be necessary.
Publication 1794-6.5.15 – December 1998
How to Install Your Incremental Encoder Module
Methods of wiring the terminal base units are shown in the illustration below.
Wiring the Terminal Base Units (1794-TB3G shown)
!
ATTENTION: Do not daisy chain power or ground from the terminal base unit to any ac or dc digital module terminal base unit.
2–3
Daisy-chaining
incremental encoder
Module incremental encoder
Module
TC/RTD/mV
Module incremental encoder
Module
24V dc
Individual
Note: All modules must be pulse, frequency or TC/RTD/mV modules for this configuration.
Wiring when total current draw is less than 10A
Digital Input
Module incremental encoder
Module
Digital Input
Module
Digital Output
Module
24V dc
24V dc
24V dc
Note: Use this configuration if using any
“noisy” dc digital I/O modules in your system.
incremental encoder Module wiring separate from digital wiring.
Wiring when total current draw is greater than 10A
Combination
incremental encoder
Module incremental encoder
Module
TC/RTD/mV
Module incremental encoder
Module
24V dc
24V dc
Note: All modules powered by the same power supply must be pulse, frequency or TC/RTD/mV modules for this configuration.
Total current draw through any base unit must not be greater than 10A
Allen-Bradley Motors
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How to Install Your Incremental Encoder Module
Installing the Module
Installation of the incremental encoder module consists of:
• mounting the terminal base unit
• installing the 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 “Mounting the incremental encoder
Module on the Terminal Base” on page 2–7.
Mounting the Terminal Base Unit on a DIN Rail
!
ATTENTION: 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.
1. Remove the cover plug (if used) 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. Position the terminal base on the 35 x 7.5mm DIN rail A (A-B pt.
no. 199-DR1; 46277-3). Proceed as follows:
B
C
A
A
Position terminal base at a slight angle and hooked over the top of the DIN rail.
4. Make certain that the female flexbus connector C is fully
retracted into the base unit.
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How to Install Your Incremental Encoder Module
2–5
Slide the terminal base unit over tight against the adapter.
Make sure the hook on the terminal base slides under the edge of the adapter and the flexbus connector is fully retracted.
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.
30077–M
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How to Install Your Incremental Encoder Module
5. Repeat the above steps to install the next terminal base.
Panel/Wall Mounting
Installation 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 “Mounting the incremental encoder
Module on the Terminal Base” on page2–7.
Use the mounting kit Cat. No. 1794-NM1 for panel/wall mounting.
1.4
(35.5)
1794-NM1 Mounting Kit
Contents:
1 – Mounting Plate for Adapter
2 – 18 #6 self-tapping screws
(2 for the adapter, and 2 each for up to 8 modules)
1
2
Adapter Module
(not included)
Terminal Base Unit
(not included)
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.
Publication 1794-6.5.15 – December 1998
Inches
(Millimeters)
.83 (21)
How to Install Your Incremental Encoder Module
1.4
(35.5)
Drilling Dimensions for Panel/Wall Mounting of FLEX I/O
2.3
(58.5)
1.4
(35.5)
2.3
(58.5)
1.4
(35.5)
2–7
More
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.
Note: The adapter is capable of addressing eight modules. Do not exceed a maximum of eight terminal base units in your system.
Mounting the Incremental Encoder Module on the Terminal Base
Unit
The incremental encoder module mounts on a 1794-TB3, TB3S,
-TBN or -TBNF terminal base unit.
1. Rotate the keyswitch (1) on the terminal base unit (2) clockwise to position 1 as required for the incremental encoder module.
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How to Install Your Incremental Encoder Module
3
4
5
7
1
2
6
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 that the pins on the bottom of the module are straight so they will align properly with the connector in the terminal base unit.
!
ATTENTION: Remove field-side power before removing or inserting the module. This module is designed so you can remove and insert it under
backplane power. When you remove or insert a module with field-side power applied, an electrical arc may occur. An electrical arc can cause personal injury or property damage by:
• sending an erroneous signal to your system’s field devices causing unintended machine motion
• causing an explosion in a hazardous environment
Repeated electrical arcing causes excessive wear to contacts on both the module and its mating connector.
Worn contacts may create electrical resistance.
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. Repeat the above steps to install the next module in its terminal base unit.
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How to Install Your Incremental Encoder Module
Connecting Wiring for
Your Incremental Encoder
Module
1794-TB3
Wiring to the module is made through the terminal base unit on which the module mounts.
Compatible terminal base units are:
Module
1794–ID2
1794-TB3
Yes
1794-TB3S
Yes
1794-TBN
Yes
1794-TBNF
Yes
1794-TB3S
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
Label placed at top of wiring area.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
A
0 –15
A
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
B
16–33
B
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
C 34–51 C
34 and 50 = 24V dc
35 and 51 = common
16 and 33 = chassis ground
40 thru 45 = chassis ground
34 and 50 = 24V dc
35 and 51 = common
16 and 33 = chassis ground
40 thru 45 = chassis ground
2–9
Connecting Wiring using a 1794-TB3 and -TB3S Terminal Base
Units
1. Connect individual input wiring (A+, A–, B+, B–, Z+, Z–, G+,
G–) to numbered terminals on the 0–15 row (A) as indicated in the table below.
!
ATTENTION: Do not connect maximum input voltage simultaneously to all inputs if the module ambient temperature is expected to exceed 40 o
C.
!
ATTENTION: If the module ambient temperature is expected to continuously exceed 40 o
C, you must limit the input voltage using an external resistor on each input. A 1K
Ω
resistor effectively limits a 24V sensor signal to about 15V at the input. Do not limit the input to less than 6V.
2. Connect the associated input common (3-wire devices only) to the corresponding terminal on the 16-33 row (B) for each input as indicated in the table below. (Commons are internally connected together.)
Allen-Bradley Motors
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How to Install Your Incremental Encoder Module
3. Terminate shields to terminals 16 or 33 on row B, or 40 through
45 on row C.
4. Connect +24V dc to terminal 34 on the 34-51 row (C).
5. Connect dc return to terminal 16 on the 16–33 row (B).
!
ATTENTION: To reduce susceptibility to noise, power frequency modules and digital modules from separate power supplies. Do not exceed a length of 33 ft (10m) for dc power cabling.
6. If continuing power to the next terminal base unit, connect a jumper from terminal 51 (+24V dc) on this base unit to terminal
34 on the next base unit.
7. If continuing common to the next terminal base unit, connect a jumper from terminal 33 (common) on this base unit to terminal
16 on the next base unit.
!
ATTENTION: Do not daisy chain power or ground from this terminal base unit to any ac or dc digital module terminal base unit.
!
ATTENTION: This module does not receive 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.
Publication 1794-6.5.15 – December 1998
How to Install Your Incremental Encoder Module
Wiring to a 1794-TBN or -TBNF Terminal Base Unit
1. Connect individual input wiring (A+, A–, B+, B–, Z+, Z–, G+,
G–) to the even numbered terminals on row (B) as indicated in the table below.
!
ATTENTION: Do not connect maximum input voltage simultaneously to all inputs if the module ambient temperature is expected to exceed 40 o
C.
2–11
!
ATTENTION: If the module ambient temperature is expected to continuously exceed 40 o
C, you must limit the input voltage using an external resistor on each input. A 1K
Ω
resistor effectively limits a 24V sensor signal to about 15V at the input. Do not limit the input to less than 6V.
2. Connect the associated input common to the corresponding odd numbered terminal on row (C) for each input as indicated in the table below.
3. Connect 24V dc to terminal 34 on row (C).
4. Connect 24V dc common to terminal 16 on row (B).
5. If continuing power to the next terminal base unit, connect a jumper from terminal 51 (24V dc) on this base unit to terminal 34 on the next base unit.
6. If continuing common to the next terminal base unit, connect a jumper from terminal 33 (24V dc common) on this base unit to terminal 16 on the next base unit.
16
16
0
34
34
1
2
Even Numbered Terminals 0 thru 14
4 6 8 10 12 14
3 5 7 9 11 13
Odd Numbered Terminals 1 thru 15
1794-TBN, -TBNF
15
33
33
51
51
16, 0, 2, 4, 6,
8, 10, 12, 14, 33
34, 1, 3, 5, 7,
9, 11, 13, 15, 51
B
C
Allen-Bradley Motors
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How to Install Your Incremental Encoder Module
Wiring connections for the 1794–ID2 incremental encoder Module
Z+
Z–
G+
G–
A+
A–
B+
B–
Z+
Z–
G+
G–
A+
A–
B+
B–
6
7
4
5
2
3
0
1
Terminal Base Units
1794–TB3, –TB3S
Signal 0V dc 12/24V dc
incremental encoder Channel 0
17
18
19
20
35
36
37
38
10
11
12
13
14
15
8
9
21
22
23
24
26
27
28
29
30
31
32
39
40
41
42 incremental encoder Channel 1
25 43
44
45
46
47
48
49
50
Terminal Base Units
1794–TBN, –TBNF
1
Signal Input
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0V dc Terminals 16 and 33 (1794–TB2)
Terminals 16 thru 33 (1794-TB3, -TB3S)
Terminals 16 and 33
12/24V dc Terminals 34 thru 51 (1794–TB3, –3S) Terminals 34 and 51
1 Auxiliary terminal blocks are required when using these terminal base units.
!
ATTENTION: Total current draw through the terminal base unit is limited to 10A. Separate power connections to the terminal base unit may be necessary.
Publication 1794-6.5.15 – December 1998
How to Install Your Incremental Encoder Module
Example of Pulse Transmitter Wiring
incremental encoder Channel 0
Signal for counter gate
–
G
+
Signal for counter calibration/preset
Signal for up/down counting
–
B
+
–
Z
+
–
+
A
External Power
Supply
12/24V dc
Signal Inputs
16
0
17
1 2
18 19
3
20
4
21
5 6
22 23
7
24
8
25
0V dc
12/24V dc
34 35 36 37 38 39 40 41 42
Example of pulse transmitter with 1 pulse train. For connection of channel 1, refer to wiring table.
Note: Dotted lines indicate signals not always used.
Example of Incremental Encoder Wiring
incremental encoder Channel 0
–
B
+
–
Z
+
–
+
A
–
G
+
33
15
51
Signal Inputs
External Power
Supply
12/24V dc
0V dc
12/24V dc
16
0
34
17
35
1
18
2
36
19
3
37
20
4
38
21
5
39
22
6
40
23
7
41
24
8
42
25 33
15
51
Example of incremental encoder with 2 pulse trains, with or without reference, and/or gate function. For connection of channel 1, refer to wiring table.
Note: Dotted lines indicate signals not always used.
Allen-Bradley Motors
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2–14
How to Install Your Incremental Encoder Module
Module Indicators
The incremental encoder module has one status indicator (PWR) that is on when power is applied to the module, and one input status indicator for each input (12 in all).
Allen-Bradley
2 CH INCREMENTAL ENCODER MODULE
1794–ID2
Chapter Summary
1
A B Z G + – A B Z G + –
C B A
A = Power/status indicator – indicates power applied to module and status of module.
B = Insertable label for writing individual I/O assignments.
C = Status Indicators –
A = Status of input A
B = Status of input B
Z = Status of input Z
G = Status of input G
+ = Positive count detected
– = Negative count detected
Indicator
A
B
Z
G
+
–
OK
Indication
Yellow
Off
Yellow
Off
Yellow
Off
Yellow
Off
Yellow
Yellow
Red
Green
Explanation
Input A active
Input A not active
Input B active
Input B not active
Input Z active
Input Z not active
Input G active
Input G not active
On when a positive pulse is detected; turns off on negative pulse.
On when a negative pulse is detected; turns off on positive pulse.
Red during initialization after power turned on
Green when initialization is completed
In this chapter, we told you how to install your incremental encoder module in an existing programmable controller system and how to wire to the terminal base units.
Publication 1794-6.5.15 – December 1998

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