For most applications the original snap-in I/O modules have been more than adequate from a shock and vibration point of view. However, some customers have indicated a preference of having the traditional screw-down mechanism of other PLCs and their I/O modules. As a result we decided to tool screw-down versions of all EZSeries PLCs as well as EZI/O. The rest of all functionality remains the same.

The EZSeries PLC with screw-down I/O offers the following advantage:
1. Better shock and vibration immunity
2. Less prone to shipping damage (particularly if the control panel is shipped with I/O upside down)
3. Less likelihood of customer not inserting the module correctly resulting in electronics damage
4. A more positive Locking Mechanism