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Rockwell Automation 1794-VHSC Very High Speed Counter Module Installation Instruction User Manual

Cat. no. 1794-vhsc, Install your very high speed counter module

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Publication 1794-IN067C-EN-P - January 2012

Installation Instructions

FLEX I/O™ Very High Speed Counter

Cat. No. 1794-VHSC

Install Your Very High Speed Counter Module

The module mounts on a 1794-TB3G or 1794-TB3GS terminal base.

1. Rotate the keyswitch (3) on the terminal base (4) clockwise to position 1 as

required for this type of module.

IMPORTANT

This module must be used with 1794-ACN15 or 1794-ACNR15
Series B or later ControlNet adapters in ControlNet systems.

Important User Information

Solid state equipment has operational characteristics differing from those of
electromechanical equipment. Safety Guidelines for the Application, Installation and
Maintenance of Solid State Controls (Publication

SGI-1.1

available from your local

Rockwell Automation sales office or online at

http://www.rockwellautomation.com/literature

) describes some important differences

between solid state equipment and hard-wired electromechanical devices. Because of
this difference, and also because of the wide variety of uses for solid state equipment,
all persons responsible for applying this equipment must satisfy themselves that each
intended application of this equipment is acceptable.

In no event will Rockwell Automation, Inc. be responsible or liable for indirect or
consequential damages resulting from the use or application of this equipment.

The examples and diagrams in this manual are included solely for illustrative purposes.
Because of the many variables and requirements associated with any particular
installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual
use based on the examples and diagrams.

No patent liability is assumed by Rockwell Automation, Inc. with respect to use of
information, circuits, equipment, or software described in this manual.

Reproduction of the contents of this manual, in whole or in part, without written
permission of Rockwell Automation, Inc. is prohibited.

Throughout this manual we use notes to make you aware of safety considerations.

WARNING

Identifies information about practices or circumstances that can
cause an explosion in a hazardous environment, which may 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.

ATTENTION

Identifies information about practices or circumstances that can lead
to personal injury or death, property damage, or economic loss.
Attentions help you identify a hazard, avoid a hazard, or recognize the
consequence

ATTENTION

Environment and Enclosure

This equipment is intended for use in a Pollution Degree 2 industrial
environment, in overvoltage Category II applications (as defined in IEC
60664-1), at altitudes up to 2000 m (6562 ft) without derating.

This equipment is considered Group 1, Class A industrial equipment
according to IEC/CISPR 11. Without appropriate precautions, there may be
difficulties with electromagnetic compatibility in residential and other
environments due to conducted and radiated disturbances.

This equipment is supplied as open-type equipment. It must be mounted
within an enclosure that is suitably designed for those specific
environmental conditions that will be present and appropriately designed
to prevent personal injury resulting from accessibility to live parts. The
enclosure must have suitable flame-retardant properties to prevent or
minimize the spread of flame, complying with a flame spread rating of
5VA, V2, V1, V0 (or equivalent) if non-metallic. The interior of the
enclosure must be accessible only by the use of a tool. Subsequent
sections of this publication may contain additional information regarding
specific enclosure type ratings that are required to comply with certain
product safety certifications.

In addition to this publication, see:

• Industrial Automation Wiring and Grounding Guidelines, publication

1770-4.1

, for additional installation requirements

• NEMA Standard 250 and IEC 60529, as applicable, for explanations

of the degrees of protection provided by enclosures

ATTENTION

FLEX I/O is grounded through the DIN rail to chassis ground. Use zinc
plated yellow-chromate steel DIN rail to assure proper grounding. The use
of other DIN rail materials (for example, aluminum or plastic) that can
corrode, oxidize, or are poor conductors, can result in improper or
intermittent grounding. Secure DIN rail to mounting surface approximately
every 200 mm (7.8 in.) and use end-anchors appropriately.

ATTENTION

Prevent Electrostatic Discharge

This equipment is sensitive to electrostatic discharge, which can cause
internal damage and affect normal operation. Follow these guidelines
when you handle this equipment:

• Touch a grounded object to discharge potential static.
• Wear an approved grounding wriststrap.
• Do not touch connectors or pins on component boards.
• Do not touch circuit components inside the equipment.
• Use a static-safe workstation, if available.
• Store the equipment in appropriate static-safe packaging when not

in use.

ATTENTION

If multiple power sources are used, do not exceed the specified isolation
voltage.

ATTENTION

Do not remove or replace a Terminal Base unit while power is applied.
Interruption of the backplane can result in unintentional operation or
machine motion.

ATTENTION

During mounting of all devices, be sure that all debris (metal chips, wire
strands, and so on) is kept from falling into the module. Debris that falls
into the module could cause damage on power up.

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