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The position of the enabling switch can be scanned in the Mobile Panel 177 via the CPU and
evaluated for non-safety relevant functions by the software.
The safety shutdown does not require an acknowledgement when an enabling switch is
released or pressed through to the panic setting!
5.1.4
STOP button
5.1.4.1
Overview
Introduction
The STOP button is an optional control element on Mobile Panel 177. The STOP button is
designed with 2 circuits and allows a safety-related stop of the system being monitored.
When an external monitoring device is used, the STOP button fulfils Category 3 safety
requirements as defined in EN 954. For further safety instructions please refer to the safety
instructions and general notes chapter.
Depending on the terminal box utilized, the stop circuit will be opened when the Mobile Panel
177 is unplugged or the circuit will be automatically short-circuited by the terminal box.
Possible application areas for the STOP button:
• The STOP button can be used to quickly stop the system being monitored (system,
• Triggering the Emergency Stop function of a system being monitored by looping it in in
Mobile Panel 177 (WinCC flexible)
Operating Instructions (Compact), Edition 07/2005
machine, or machine zone) according to the process cycle. The Stop operation can occur
with or without a power shutdown.
Advantages:
– Containing the sphere of action
– Faster restart
– No loss of machine coordinates and, thus, no recalibration upon restart
– Preservation of tool and workpiece
the Emergence Stop circuit.
Advantage:
Simple integration in an existing Emergency Stop circuit when the system to be
monitored has no option for a fast process stop.
Operator elements and displays
5.1 Mobile Panel
5-5
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