Applications And Pictograms - Wieland samos User Manual

Glossary

Applications and Pictograms

52
Emergency stop monitoring
The emergency stop function is used to protect persons and machines by directly
disconnecting the power supply.
Safety door monitoring
Safety door monitors with sensors (e.g. position switches, coded electromagnetic
switches) are used for monitoring separating safety devices.
Static valve monitoring
Position monitoring with position switches.
Switching mat monitoring
Short-circuiting switching mats are access monitoring sensors that alter their
control state when stood upon.
Two-hand function
Two-hand functions as per EN574 protect the operator of presses, cutting and
bending machines, machining centers, etc. The two controls (two-hand buttons)
must be actuated at the same time to initiate the dangerous operation. If one or
both of the buttons is released the enable is canceled.
On press control systems the function must only be used in accordance with EN
574 Typ IIIC.
Two-hand operation in jog mode
In jog mode an output signal is only generated while the controls are being
pressed, e.g. for motions in setup mode. Jog mode on the base modules is
restricted to 5 s.
Light barrier / light curtain monitoring
Access monitoring with self-testing sensors (e.g. type 4 non-contact safety devices).
A non-contact safety device is a setup of devices and/or components that work
together for safety shutdown and detection of persons. The non-contact safety
device has at least a sensor function (e.g. safety light barrier or other secure
sensors), a monitoring function (e.g. cyclical self-tests) and an output switching
element (OSSD). The function is matched for modulated self-test signals or
overcurrent limitation of sensor semiconductor outputs.
Light barrier / light curtain monitoring
Access monitoring with testable sensors (e.g. type 2 non-contact safety devices). The
sensors have separate activation inputs that are used to test the sensor function
with a low signal; the base module analyses the response signal generated by the
receiver. Several sensors can be cascaded.
Controlled stopping
With the settable off delay a drive can be switched off after expiry of the time
according to stop category 1 and EN 60204, and if required a brake can be
applied.
Safe Position
Safe position, e.g. of a robot, is detected by a sensor. Zone protection is lifted and
an operator can enter the robot zone. If the robot leaves the position it is switched
off safely.
© 2010 Wieland Electric GmbH | BA000256 | 12/2012 (Rev. I)