General information
TR-Electronic GmbH 2012, All Rights Reserved
Printed in the Federal Republic of Germany
Page 12 of 56
TR - ECE - BA - GB - 0095 - 19
05/30/2018
1.5 Principle of the safety function
System safety results when:
–
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 speed in two channels and
transfers the safe data to the PROFINET IO in the PROFIsafe protocol
–
In the event of a failed channel comparison or other errors detected
through internal diagnostic mechanisms, the measuring system switches
the PROFIsafe channel into error state
–
The measuring system initialization and execution of the preset adjustment
function are appropriately verified
–
The control additionally checks whether the obtained position data lie in the
position window expected by the control. Unexpected position data are e.g.
position jumps, tracking error deviations and incorrect direction of travel
–
When errors are detected the control introduces appropriate safety
measures defined by the system manufacturer
–
The system manufacturer ensures, through correct mounting of the
measuring system, that the measuring system is always driven by the axis
for measurement and is not overloaded
–
The system manufacturer performs a verified test during commissioning
and in the event of any parameter modification
