Pilz PSS SB HYD, Basic license - Manual (Page 229)

Modular Block System: Hydraulic Presses 6-167
A warning is issued (output parameter WARN) when a filament has blown.
Only the second filament will then be tested every 12 seconds. If the
second filament blows, the enable will be removed (output parameter
ENBL).
The defective muting lamp can be exchanged during operation once the
warning has been issued. When it has been exchanged, the warning must
be acknowledged via the input parameter
RSET.
The input parameter 1OUT can be used to determine whether both muting
lamps are to be tested simultaneously or alternately.
Guidelines for the design and layout of the muting lamps
Muting lamps should be positioned in such a way that the machine
operator can see the muting lamps from any standard position, whenever
the muting function is being performed.
We therefore recommend the use of signals which emit light all round;
these are available in different designs from various manufacturers. These
signal lights can often be combined in a modular structure to form
multilevel signal systems, with lights in various colours.
With a three-stage signal system, both muting lamps and the warning
lamp for displaying a failed lamp could be combined, for example.
INFORMATION
Muting lamps that use LEDs for illumination cannot be monitored using
SB097.