Mitsubishi Electric WS0-CPU0 Operating Manual page 211

Figure 196:
Safety when mounting the
muting sensors
Figure 197:
Detection of material during
muting
Logic programming – Function blocks
 Always position the muting sensors in such a way that only the material is detected
and not the conveyance means (pallet or vehicle).
 Always position muting sensors in such a way that the material can pass
unimpeded, but persons are detected reliably.
 Always position the muting sensors in such a way that a minimum distance to the
detection area of the ESPE (e.g. to the light beams of a light curtain) is observed
while the material is being detected.
 It has to be ensured that no persons are within the hazardous area before and
during the activation of an override.
 Before you activate the override ensure that the equipment is in a perfect condition,
in particular the muting sensors (visual inspection).
 When it has been necessary to activate an override, subsequently check whether
the equipment functions properly and the layout of the muting sensors.
 During long muting cycles (i.e. longer than 24 hours) or during longer machine
downtimes check that the muting sensors function correctly.
 A muting and/or override lamp has to be used in order to signal that the muting or
override function is active. It is possible to use an external muting/override lamp or
one that is integrated in the protective device (ESPE).
 It may be necessary to monitor the muting/override lamp depending on your local,
regional and national regulations and standards. If this is the case, this has to be
realized by additional means. WS0-XTIO and WS0-XTDI modules do not support
lamp monitoring.
 Always position the muting or override lamp so that it can be seen well! It must be
possible to see the muting or override lamp from all positions around the hazardous
area and for the system operator.
 If safety-relevant information (i.e. distributed safety input values and/or safety output
values) is transferred via a safety field bus network, always take the corresponding
delays into account. These delays can influence both the system behaviour as well
as the requirements for the minimum safety distances that are connected to the
response times.
Chapter 9
208