ICP DAS USA M2M-710D, User Manual

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M2M-710D User Manual (Version 1.00, Mar/2009) PAGE
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39
8. Frame Ground
Electronic circuits are constantly vulnerable to Electro Static Discharge (ESD), which becomes
worse in a continental climate area. M2M-710D module 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.
It is recommended that the Frame Ground of the M2M-710D module is corrected to the earth
ground, such as the ground of an AC power supply, to provide better ESD protection for the
module.
The M2M-710D module is designed with two Frame Ground contact points, Frame-Ground-A
and Frame-Ground-B, as shown in the figure below. When mounted to a DIN rail, Frame-
Ground-B and the DIN rail are in contact. Thus, protection can be achieved by also connecting
the DIN rail to earth ground.
Figure 41 Frame Ground_BFrame Ground_A