Allen-Bradley SLC 500 1747-L20 User manual

Installation Instructions
SLC 500™ Fixed Hardware Style
Controllers
(Catalog Numbers 1747-L20, 1747-L30, and 1747-L40)
Inside… page
English Section....................................................................................... 3
Section en français............................................................................... 23
Deutscher Abschnitt............................................................................. 43
Sezione italiana.................................................................................... 63
Sección en español............................................................................... 83
Physical Dimensions........................................................................... 103
Wiring Diagrams................................................................................. 104
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Publication 1747-IN008B-MU-P
Installation Instructions
English Section
SLC 500™ Fixed Hardware Style
Controllers
(Catalog Numbers 1747-L20, 1747-L30, and 1747-L40)
Inside… page
Important User Information .................................................................... 4
For More Information.............................................................................. 5
Safety Considerations............................................................................. 6
Controller Spacing .................................................................................. 7
Mounting the 2-Slot Expansion Chassis (Optional)................................ 7
Mounting Your Controller ....................................................................... 8
Configuring the High-Speed Counter...................................................... 9
Grounding Your Controller .................................................................... 10
Wiring Your Controller .......................................................................... 11
Understanding LED Messages.............................................................. 12
Configuration Options........................................................................... 15
Specifications ....................................................................................... 16
Using Surge Suppressors...................................................................... 19
Physical Dimensions ........................................................................... 103
Wiring Diagrams................................................................................. 104
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4SLC 500™ Fixed Hardware Style Controllers
Publication 1747-IN008B-MU-P
Important User Information
Because of the variety of uses for the products described in this publication, those
responsible for the application and use of this control equipment must satisfy
themselves that all necessary steps have been taken to assure that each application
and use meets all performance and safety requirements, including any applicable
laws, regulations, codes, and standards.
The illustrations, charts, sample programs, and layout examples shown in this guide
are intended solely for purposes of example. Since there are many variables and
requirements associated with any particular installation, Allen-Bradley does not
assume responsibility or liability (to include intellectual property liability) for actual
use based upon the examples shown in this publication.
Allen-Bradley publication SGI-1.1, Safety Guidelines for the Application, Installation,
and Maintenance of Solid-State Control (available from your local Allen-Bradley
office), describes some important differences between solid-state equipment and
electromechanical devices that should be taken into consideration when applying
products such as those described in this publication.
Reproduction of the contents of this publication, in whole or in part, without
written permission of the Allen-Bradley Company is prohibited.
Throughout these installation instructions we use notes to make you aware of safety
considerations:
Attention statements help you to:
•identifyahazard
•avoidthehazard
• recognize the consequences
!
ATTENTION
Identifies information about practices or circumstances that can
lead to personal injury or death, property damage, or economic
loss.
IMPORTANT Identifies information that is critical for successful application
and understanding of the product.

SLC 500™ Fixed Hardware Style Controllers 5
Publication 1747-IN008B-MU-P
For More Information
As part of our effort to preserve, protect, and improve our environment,
Allen-Bradley is reducing the amount of paper we use. Less paper means more
options for you. In addition to traditional printed publications and CD-ROM
versions, we now offer on-line manuals with the most up-to-date information
available. We recommend that you read the related publications listed below before
starting up your control system.
Related Publications
If you would like a manual, you can:
• download a free electronic version from the internet at
www.theautomationbookstore.com
• purchase a printed manual by:
– contacting your local distributor or Rockwell Automation representative
– visiting www.theautomationbookstore.com and placing your order
– calling 1.800.963.9548 (USA/Canada or 001.330.725.1574 (Outside
USA/Canada)
For Refer to this Document Pub. No.
A more detailed description on how to install
and use your fixed SLC 500 system.
SLC 500 Fixed Hardware
Style Installation and
Operation Manual
1747-6.21
A reference manual that contains status file
data, instruction set, and troubleshooting
information.
SLC 500 and MicroLogix
1000 Instruction Set
Reference Manual
1747-6.15
A CD-ROM containing both of the manuals
listed above, plus the:
• SLC 500 Modular Hardware Style
Installation and Operation Manual
• SLC 500 Analog I/O Modules User Manual
• Discrete I/O Modules Installation
Instructions
• Discrete I/O Modules Product Data
SLC 500 Literature
Collection on CD-ROM
1747-CD1-1
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6SLC 500™ Fixed Hardware Style Controllers
Publication 1747-IN008B-MU-P
Safety Considerations
High Voltages -
SLC 500 Fixed Hardware Style Controller (Series C)
(Applies to 1747-L20A, -L30A, -L40A, -L20C, -L30C, and -L40C
controllers)
For general recommendations concerning installation safety requirements and safety
related work practices, refer to the requirements specific to your region.
•Europe: Reference the standards found in EN 60204 and your national
regulations.
•United States: Refer to NFPA 70E, Electrical Safety Requirements for Employee
Workplaces.
!
ATTENTION The printed circuit board, located under the front cover of Series
C fixed hardware style controllers, has high voltages (120V ac
and 240V ac) available at certain points when the controller is
powered up. If the front cover is removed, exercise extreme care
and consider all points on the circuit board to be electrically
hazardous. Whenever possible, turn off power to the controller
before removing the cover.
Do not remove the protective insulation covering the circuit
board. If the insulation is missing, do not touch any portion of
the circuit board. Failure to heed this warning may result in
personal injury or death.
Front Cover

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Publication 1747-IN008B-MU-P
Controller Spacing
Follow the recommended controller orientation and minimum spacing shown below
to allow for convection cooling within the enclosure. Air in the enclosure must be
kept within the range of 0°C to +60°C (+32°F to +140°F).
Mounting the 2-Slot Expansion Chassis (Optional)
The expansion chassis mounts on the right side of the fixed controller.
1. Align the mounting inserts of the expansion chassis with the mounting slots of
the controller. Slide the expansion chassis forward until the back of the expansion
chassis is flush with the fixed controller and the connector on the expansion
circuit board is mated with the connector in the controller.
A
B
A
B
TOP
SIDESIDE
BOTTOM
A. Greater than 101.6 mm (4 in.)
B. Greater than 152.4 mm (6 in.)
Enclosure
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8SLC 500™ Fixed Hardware Style Controllers
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2. To install additional I/O and specialty I/O modules, gently slide the module in
until the top and bottom retainer clips are secured.
Mounting Your Controller
You can mount the fixed hardware style unit directly to the back panel of your
enclosure using the mounting tabs and #10 and #12 screws. The maximum torque
requirement is 3.4 N-m (30 in-lbs).
To install your controller using mounting screws:
1. Position your controller on the mounting
surface. (Make sure the controller is spaced
properly. See page 7 for further information.)
2. Mark the positions of the mounting tabs and
drill the appropriate holes.
3. Mount your controller.
!
ATTENTION Be careful of metal chips when drilling mounting holes for your
controller. Metal chips or clippings may short circuit electronic
components of the controller and cause damage.
Capacitors on input modules have a stored charge that can cause
a non-lethal shock. Avoid mounting the controller in a position
where installation or service personnel would be in danger from a
startle reaction.
Retainer clip
Mounting Tabs

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Configuring the High-Speed Counter
The fixed controllers that have 24V dc input circuits are also equipped with a
high-speed counter. For high-speed counter use, follow the procedure below:
1. Turn off power to the fixed controller.
2. Remove the SLC 500 cover.
3. Locate and cut jumper wire J2. The jumper is either beneath or to the right of the
battery connector. Do not remove the jumper wire completely, but make certain
that the ends of the cut jumper wire are not touching each other.
!
ATTENTION
When power is applied to the controller, hazardous electrical
potentials exist under the front cover. See page 6 for further
information.
J2 J2
Power
Fuse
The High-Speed Counter jumper is located either beneath the battery connector OR to
the right of the battery connector.
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Grounding Your Controller
In solid-state control systems, grounding helps limit the effects of noise due to
electromagnetic interference (EMI). Run the ground connection from the ground
screw of the controller (first screw from the left on the lower input terminal rung) to
the ground bus.
You must also provide an acceptable grounding path for each device in your
application. Exact connections will differ between applications. For more
information on proper grounding guidelines, refer to Industrial Automation Wiring
and Grounding Guidelines, Publication Number 1770-4.1 or the requirements
specific to your region:
•Europe: Reference the standards found in EN 60204 and your national
regulations.
•United States: Refer to NFPA 70E, Electrical Safety Requirements for Employee
Workplaces.
!
ATTENTION
The SLC 500 controller, other control devices, and the enclosure
must be properly grounded. All applicable codes and ordinances
must be observed when wiring the controller system.
SLC 500 Controller Only
#14 AWG
Wire
#10 AWG
Wire
#8 AWG
Wire
#8 AWG
Wire
#10 AWG
Wire
#14 AWG
Wire
SLC 500 Controller with 2-Slot Expansion Chassis
Chassis Mounting Tabs
Chassis Mounting Tabs
Earth
Ground
Earth
Ground
Ground
Bus
Ground
Bus