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5.1.3
Enable switch
Introduction
Enabling equipment consists of two enabling switches arranged on both sides of the Mobile
Panel 177. The switch setting of the two enabling switches is determined by electrical
momentary contact switches. The associated evaluating logic involves two channels for each
enabling switch. Each channel converts the information of the enabling switch into digital and
analog information (diversity).
Figure 5-2
①
Operation
You only have to activate one enabling switch. No feedback is provided to the PLC on
whether the Mobile Panel 177 is operated with one hand or two hands.
Note
Because there is no electrical connection between the enabling switch and the membrane
keyboard, the enabling switches and the membrane keyboard can be operated
simultaneously.
When an external monitoring device is used, the enabling switches satisfy Category 3 safety
requirements as defined in EN 954.
Mobile Panel 177 (WinCC flexible)
Operating Instructions (Compact), Edition 07/2005
Enable switch
Enable switch
Operator elements and displays
5.1 Mobile Panel
5-3
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