Rockwell Automation Publication 450L-UM001F-EN-P - March 2022
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Chapter 4 Safety Function
The muted condition remains only if muting sensors S1 and S2 are activated
within the specified time (t
sens
) and less than the muting time (t
Mute
).
The muting condition stops if one of the following occurs:
•
S3 and S1 are no longer activated (one direction)
•
S3 and S2 are no longer activated (other direction)
•
The maximum muting time (t
Mute
) is exceeded (muting timeout)
Only after one muting sequence is finished can a new muting sequence be
started. The enable signal S3 must first go HI before returning to LO, in order
for a second object to pass through the light curtain (for example, the
equivalent to a conveyor stop and restart).
shows the default settings for two-sensor L-type muting with enable.
Use Connected Components Workbench software to change the settings.
If you get a timing error, the mute lamp flashes at 1 Hz and the mute timing
error output turns ON.
If the object stops in front of the first sensor and does not block the light
curtain, the mute timing error goes HI and the mute lamp flashes at 1 Hz. The
OSSD outputs remain ON, which allows you to reverse the conveyor and
restart the muting sequence.
Use the S3 muting signal to clear the errors. When S3 goes HI, it clears the
mute timing error, mute sequence error, and the muting error outputs.
Four-sensor Muting
The sensors and light curtain form the shape of an upside down “T”, when
viewed from the side. Two muting sensors (MS) are mounted on either side of
the light curtain (LC).
Figure 22 - Four-sensor Muting
The material can travel in either direction, which breaks MS1 first and MS4
last, or breaks MS4 first and MS1 last. The muting lamp turns on and the light
curtain is muted after the second sensor is blocked. The object must be large
enough to interrupt all four sensors.
For connecting the muting sensors, see
.
Table 12 - Two-sensor T-type Muting with Enable Default Settings
Parameter
Default Value
t
sens
4 s
t
Mute
5 min
t
mdo
20 s
t
espe
4 s
2
S
M
1
S
M
4
S
M
3
S
M
LC
Machine
Material
Conveyor
Muting Lamp
Mu
te
d LC
