Important Notes For The Enabling Mechanism - Siemens SIMATIC HMI Series Operating Instructions Manual

Safety instructions

2.7 Important notes for the enabling mechanism

NOTICE
Versions of the connection box
If you install connection boxes with and without emergency stop / stop bypass in your fail-
safe automation system, there is a risk that an accidental shutdown is triggered when
replugging an HMI device.
In a fail-safe automation system, you should therefore only use "compact" and "standard"
connection boxes together or "advanced" boxes only.
PROFIsafe-based F-system
Regardless of the type of the connection box, a fail-safe Mobile Panel must be logged off
from the safety program before removing the plug of the connecting cable from the
connection box. No accidental disconnection can be triggered if these instructions are
followed.
2.7 Important notes for the enabling mechanism
In a numerically controlled plant, "setup mode" requires an enabling mechanism. The
enabling mechanism consists of the enabling button installed on the HMI device and the
corresponding logic in the HMI device.
The operating modes relevant for the enabling mechanism are:
● Setup mode
In setup mode, safety has to be ensured in a different way than in automatic mode.
During setup mode, personnel enter danger zones of the plant in which controlled
movements must be possible.
Movements must be executed with reduced speed in setup mode in line with the risk
assessment of the plant. Movement of plant parts should only be possible when the
enabling mechanism is activated. Operators must have been trained accordingly and
have detailed knowledge of the intended use.
● Process monitoring in manufacturing
This operation mode is used for processing complex workpieces, for example, or in cases
when parts of the workpiece cannot be inspected. This operating mode allows additional
manual intervention in line with DIN EN 13128 "Safety of machine tools - Milling and
boring machines". Unlike in automatic mode, the user is able to monitor and control the
processing process with open separating protective devices.
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Mobile Panels 2nd Generation
Operating Instructions, 09/2018, A5E33876626-AC