Allen-Bradley Guardmaster 440C-CR30-22BBB - Operational Sequence

42 Rockwell Automation Publication 440C-WD001C-EN-P - June 2015
Chapter 7 Muting 4-sensor T-type Bidirectional
Operational Sequence
The muting sensors and the light curtain participate in the sequence of events to
achieve the muting. The material must move past the sensors and into the light
curtain within the synchronization times, which are set in the Connected
Components Workbench function block. In addition, the material must move
through the light curtain within the muting time, which is also set in the
Connected Components Workbench function block.
Figure 27 - Operational Sequence
As the material moves, it must block both muting sensors within their
synchronization times, which are configured in the Connected Components
Workbench function block for 3seconds. The light curtain is then muted. The
material must move through the light curtain within the specified muting time,
which is configured in the Connected Components Workbench software to be
10 seconds.
If the material movement exceeds one of the synchronization times or the muting
time,
the conveyor stops. An operator can press and hold down the override
button during the override time. The conveyor contactors turn on until the
override time expires (or the operator releases the button).
LC
Muting sensor 1 (4)
Muting sensor 2 (3)
Muting sensor 3 (2)
Muting sensor 4 (1)
Muting lamp
t > 30ms t > 30ms t > 30ms t > 50ms
30ms <= t
t < synchronization
time
30ms <= t
t < synchronization
time
t < muting time
muted