DL06 Micro PLC User Manual, 3rd Edition, Rev. E
Chapter 2: Installation, Wiring, and Specifications
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Safety Guidelines
NOTE: Products with CE marks perform their required functions safely and adhere to relevant
standards as specified by CE directives, provided they are used according to their intended purpose,
and the instructions in this manual are strictly followed. The protection provided by the equipment
may be impaired if this equipment is used in a manner not specified in this manual. A listing of our
international affiliates is available on our Web site: http://www.automationdirect.com
WARNING: Providing a safe operating environment for personnel and equipment is your
responsibility and should be your primary goal during system planning and installation. Automation
systems can fail and may result in situations that can cause serious injury to personnel and/
or damage equipment. Do not rely on the automation system alone to provide a safe operating
environment. Sufficient emergency circuits should be provided to stop the operation of the PLC
or the controlled machine or process, either partially or totally. These circuits should be routed
outside the PLC in the event of controller failure, so that independent and rapid shutdown are
available. Devices, such as mushroom switches or end of travel limit switches, should operate
motor starter, solenoids, or other devices without being processed by the PLC. These emergency
circuits should be designed using simple logic with a minimum number of highly reliable
electromechanical components. Every automation application is different, so there may be special
requirements for your particular application. Make sure all national, state, and local government
requirements are followed for the proper installation and use of your equipment.
Plan for Safety
The best way to provide a safe operating environment is to make personnel and equipment
safety part of the planning process. You should examine every aspect of the system to determine
which areas are critical to operator or machine safety. If you are not familiar with PLC system
installation practices, or your company does not have established installation guidelines, you
should obtain additional information from the following sources.
• NEMA — The National Electrical Manufacturers Association, located in Washington, D.C.,
publishes many different documents that discuss standards for industrial control systems. You can
order these publications directly from NEMA. Some of these include:
ICS 1, General Standards for Industrial Control and Systems
ICS 3, Industrial Systems
ICS 6, Enclosures for Industrial Control Systems
• NEC — The National Electrical Code provides regulations concerning the installation and use of
various types of electrical equipment. Copies of the NEC Handbook can often be obtained from your
local electrical equipment distributor or your local library.
• Local and State Agencies — many local governments and state governments have additional
requirements above and beyond those described in the NEC Handbook. Check with your local
Electrical Inspector or Fire Marshall office for information.
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