Specifications

Publication 1794-SG002D-EN-P - May 2012
114 Mount the FLEX System
When properly installed, FLEX I/O and FLEX Ex I/O are grounded through
the DIN rail to chassis ground. Use a zinc-plated, yellow-chromated steel DIN
rail to assure proper grounding. Using other DIN rail materials, for example,
aluminum or plastic, which can corrode, oxidize, or are poor conductors can
result in improper or intermittent platform grounding.
If installing FLEX on non-recommended DIN rail materials, use the mounting
holes provided with each terminal base, or use a 1794-NM1 mounting kit with an
approved mounting bracket. Use mounting screws with star washers to provide
the FLEX platform with a chassis ground connection that is not likely to be
affected by shock, vibration, or oxidation over time.
The hook (on the terminal base unit) and adjacent connection point (on the
communication adapter) keep the terminal base units tight together. These
components are capable of maintaining a reliable connection in case of shock
and/or vibration. Refer to the environmental specifications section for each
module.