SICK EtherNet/IP microScan3 - Page 64

The restart interlock prevents the machine from automatically starting up, for example
af
ter a protective device has responded while the machine is operating or after chang‐
ing the machine’s operating mode.
First, the operator must press a reset pushbutton to return the protective device to
monitoring status. Then, in a second step, the operator can restart the machine.
Depending on applicable national regulations, a restart interlock must be available if it
is possible to stand behind the protective field.
DANGER
H
azard due to lack of effectiveness of the protective device
The dangerous state may not be stopped in the event of non-compliance.
If a protective field is interrupted, the safety output switches to the OFF state for at
least 80ms, even if the interruption is shorter than that time. With a safety output
via network, it can happen that the controller does not detect the OFF state in the
event of a very short protective field interruption, e.g. if the Network Time Expectation is
configured to be greater than 80ms.
14)
The internal restart interlock of the safety laser scanner must be used to end the
dangerous state.
►
If the network time expectation is longer than 80ms, use the internal restart
interlock of the safety laser scanner.
Reset
T
he reset brings the protective device back to the monitoring state after it has sent
a stop command. The reset also quits the start-up or restart interlock of a protective
device, so that the machine can be restarted in a second step.
The reset must only be possible, when all safety functions and protective devices are
functional.
The reset of the protective device must not introduce any movement or dangerous
situations itself. The machine is only permitted to start after the reset once a separate
start command has been sent.
•
Manual resets are performed using a separate, manually operated device, such as
a reset pushbutton.
•
Automatic resets by the protective device are only permitted in special cases, if
one of the following conditions is met:
°
It must not be possible for people to be in the hazardous area without
triggering the protective device.
°
It must be ensured that no people are in the hazardous area during or after
the reset.
Internal restart interlock
Eac
h safety output of the safety laser scanner is equipped with a configurable internal
restart interlock.
With safety outputs via the network, resetting is done via a network signal.
When the internal restart interlock is used, the following sequence is the result for the
machine operator:
1 A safety output of the safety laser scanner switches to the OFF state, if there is an
interruption in the protective field.
2 The safety output remains in the OFF state when there is no longer an object in
the protective field.
14)
T
he Network Time Expectation is sometimes referred to as the Connection Reaction Time Limit.
4 P
ROJECT PLANNING
64
O P E R A T I N G I N S T R U C T I O N S | microScan3 – EtherNet/IP™ 8020200/1NTM/2024-06-03 | SICK
Subject to change without notice