ICT Today

January/February/March 2020 I 29 the TIA or ISO standards, even though it may be found on the factory floor (typically on machine as part of a prepackaged machine control system). Wireless design and implementation for an industrial Ethernet network demands the attention of another written article on the topic. It is vulnerable to link loss due to physical and/or RF changes within the serviced area. These are often difficult to control effectively. The access level portion of the physical connectivity requires a significant investment of the infrastructure designer's time, since it is where the media must directly interface with the equipment and environment of the factory floor. The TIA-1005-A standard includes a rating system that is a comprehensive guideline for categorizing various areas of a factory floor to help specify the appropri- ate physical layer infrastructure components. Consider the following example to introduce the concept. The ANSI/TIA-1005-A standard recommends the use of four basic categories to assist in selecting components that will suit the environment: Mechanical, Ingress, Chemical/Climatic, Electromagnetic (MICE). Each are rated in ascending severity from 1 to 3. As part of this process, it must be determined whether any in-house or third party material specifications exist that may denote the pathway types prior to moving to media selection. • Do any temperature or humidity extremes exist? • Is there any mobile equipment that requires wireless connectivity? • Are there any remotely located end devices (beyond 90 m) that require wireless connectivity consideration? Consider the following example in which it is assumed that there is an existing local industrial network zone enclosure with the required access level switches, in order to focus on the physical media from end device to the access level switch. The client is upgrading a portion of the plant floor control system to Ethernet connectivity. This system includes four control panels, an operator control station inside a control room, three production monitoring IP/power over Ethernet (PoE) cameras, and a display monitor for the cameras also located in the control room. The control panels house programmable logic controllers (PLCs), associated remote input-output (I/O) racks, and variable frequency drives (VFDs) which will be connected in a ring topology utilizing embedded switch technology within the hardware components. Each of the cameras will be connected back to the network zone enclosure in the typical star topology. Fiber Optic Enclosure, 1 RMS Save 40% or More Compared to Big Brands $110 801.484.5238 Utah 800.238.0787 Nebraska 800.309.2322 California 800.422.6191 Ohio 888.792.7463 Maryland 800.847.5629 Texas Available at: $229 *Based on various online surveys. icc.com/fiber1 P/N: ICFORE31RM Installer's cost * Big Brand • Holds 3 LGX ® panels • Supports 72 fibers (LC) • 20 gauge steel • Slide-out tray • Removable covers • Built-in windows p p p p p p p p p p p p mpr-0445 - ICT JOURNAL Jan-Mar 2020 Quarter Ad.indd 1 mpr-0445 - ICT JOURNAL Jan-Mar 2020 Quarter Ad.indd 1 11/25/2019 8:51:27 AM 11/25/2019 8:51:27 AM Some questions to ask include: • Are any areas denoted as classified under NEC/CEC regulations (e.g., dust, mists, or vapors with potential for explosion)? • Are any areas regulated under the hazard analysis critical control point (HACCP) principles for food safety? • Do any areas have corrosive environments to certain metals and plastics that will require specific pathway materials? • Are there wash down areas that require water and/or other cleaning agents? • Are there areas with high potential for physical damage (e.g., vehicle traffic or moving machinery)?

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