July 2013 6.6 Gantry/synchronized axes 795
The diagram shows the status signals of the two PLC Modules 9159 and 9162,
as well as the trigger signal for the brake from the HEIDENHAIN inverter (0 =
brake is closed). The diagram shows the basic sequence during a switch-on
process with brake test, as well as a switch-off process with overlap time for
braking. A value of "1" from PLC Module 9162 indicates that the drive is ready.
A value of "1" from PLC Module 9159 at the beginning of the diagram indicates
the duration of the brake test. A value of "1" from PLC Module 9159 at the end
of the diagram corresponds to the overlap time for braking (typically 200 ms).
HEIDENHAIN recommends the sequential brake test of synchronized axes
for all machines on which a brake test for synchronized axes is made
(MP860 bit 2 = 1).
Test the behavior of the PLC program and the brake test on the machine.
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