Rockwell Automation 442L SafeShield Safety Light Curtain Hardware - Manual (Page 12)

SafeShield Safety Light Curtain Hardware User Manual
12
Only the external restart interlock prevents the machine from
restarting. After pressing the reset button for the SafeShield safety
light curtain, the operator must also press the restart button for
the machine. If the reset button and the restart button are not
pressed in this specified sequence, the dangerous state remains
unchanged.
Recommendation
The reset button prevents the accidental and inadvertent operation
of the external restart button. The operator must first
acknowledge the dangerous state with the reset button.
External Device Monitoring (EDM)
The EDM checks if the contactors actually de-energize when the
protective device responds. If you activate external device
monitoring, then the SafeShield safety light curtain checks the
contactors after each interruption to the light path and prior to
machine restart. The EDM can also identify if one of the contactors
has fused, for instance. In this case …
• The error message 8 appears in the 7-segment display.
• The safety light curtain remains red.
• With the internal restart interlock activated, the safety light
curtain uses the flashing LED Yellow to signal “Reset
required.”
Notes If the system is unable to change to a safe operational
state (e.g. after contactor failure), the system locks and
shuts down completely (lock-out). The 7-segment display
will then show the error message .
The electrical connection for the external device monitoring is
described in “External Device Monitoring (EDM)” on page 12.
Device symbol SafeShield safety light curtain receiver,
context menu Configuration draft, Edit, file card General,
option EDM.
Emergency Stop
The SafeShield safety light curtain has an input for a two-channel
emergency stop button.The emergency stop monitoring in the
device corresponds to stop category 0 in accordance with EN 418.
You can connect e.g. a door contact or an emergency stop button
to the emergency stop input. The operation of the emergency stop
button has the following effect:
• The safety light curtain deactivates the OSSDs.
• The host switches to red.
• The 7-segment display on the host indicates .
Notes The emergency stop function deactivates the OSSDs even
if the bypass function is activated.
Take into account the response time of the emergency stop
function! The response time of the safety light curtain on
interruption via the emergency stop input is up to 200ms.
!
Notes The SafeShield safety light curtain checks after power up
whether an emergency stop has been configured and
whether a door switch or similar switch is connected. If
the configuration and the electrical connection do not
match, the system locks completely (lock-out). The 7-
segment display will then show the error message .
The safety light curtain has a signal output (ADO) at which
the status of the emergency stop input can be signalled.
For details refer to the next section.
The electrical connection of the emergency stop is described in the
“Emergency Stop” section on page 12.
Device symbol SafeShield safety light curtain Host
(receiver), context menu Configuration draft, Edit, file
card General, option Emergency Stop active.
Signal Output (ADO)
The SafeShield safety light curtain has a signal output (ADO) that
can be configured. With the aid of the signal output, the safety light
curtain can signal specific states. This signal output can be
connected to a PLC/relay/lamp.
ATTENTION: Pay attention to the way
in which the emergency stop function
works!
The emergency stop button connected to
the extension connection on the SafeShield
safety light curtain affects only the switching
outputs (OSSDs) on the SafeShield safety
light curtain.
ATTENTION: Regularly check the
connected emergency stop button or
door contact!
➢ By means of organizational measures
ensure that the emergency stop button or
door contact is operated once at a
specified interval.
This is necessary so that the SafeShield
safety light curtain can detect any fault that
has occurred on the emergency stop
button or door switch. The interval is to
be defined to suit the specific case
dependant on the application.
➢ Always check whether the switching
outputs on the light curtain are
deactivated on the operation of the
emergency stop button or door switch.
!