M-7084 User Manual, Rev. A1.3 7PH-013-A13
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A.3 Frame Ground
Electronic circuits are constantly vulnerable to Electro-Static
Discharge (ESD), which become worse in a continental
climate area. Some I-7000 and M-7000 modules feature a
new design for the frame ground, which provides a path for
bypassing ESD, allowing enhanced static protection (ESD)
capability and ensures that the module is more reliable.
Either of the following options will provide a better protection
for the module:
1.
If the module is DIN rail mounted, connect the DIN rail to
the earth ground because the DIN rail is in contact with the
upper frame ground as shown in the figure below.
2.
Alternatively, connect the lower frame ground terminal to
a wire and connect the wire to the earth ground, as shown
in the figure below.