TR-Electronic GmbH 2019, All Rights Reserved Printed in the Federal Republic of Germany
Page 14 of 154 TR - ECE - BA - GB - 0139 - 02 11/21/2019
1.5 Principle of the safety function
System safety is established as follows:
– Each of the two scanning channels is largely fail-safe thanks to individual diagnostic
measures.
– The measuring system internally compares the positions detected by both channels in two
channels, also determines the velocity in two channels and transfers the safe data in the
PROFIsafe protocol via PROFINET IO.
– In the event of a failed channel comparison or other error detected through internal diagnostic
mechanisms, the measuring system switches the PROFIsafe channel to error state.
– Initialization of the measuring system and execution of the preset adjustment function are
appropriately safeguarded.
– The control additionally checks whether the obtained position data are within the position
window expected by the control. Unexpected position data are, e.g., position jumps, tracking
error deviations and incorrect direction of travel.
– In case errors are detected, the control introduces appropriate safety measures defined by the
system manufacturer
– The system manufacturer ensures, through correct attachment of the measuring system, that
the measuring system is always driven by the axis to be measured and is not overloaded.
– The system manufacturer performs a safeguarded test during commissioning and whenever a
parameter has been changed.
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