
ET-7X00/PET-7X00 User Manual, version 1.1.2 Page: 9
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Frame Ground
Electronic circuits are constantly vulnerable to Electrostatic Discharge (ESD), which
becomes worse in a continental climate area. The ET-7X00/PET-7X00 series features a
new design for the frame ground that provides a path for bypassing ESD, allowing
enhanced static (ESD) protection capabilities and ensuring that the module is more
reliable.
Choosing either of the following options will provide a better level of protection for
the module:
The ET-7X00/PET-7X00 has a metallic board attached to the back of the plastic case,
shown as “1” in the figure below.
When mounted to a DIN-Rail, connect the DIN-Rail to the earth ground because the
DIN-Rail is in contact with the upper frame ground, as shown as “2” in the figure
below.