Banner EZ-SCREEN­ Safety Light Curtain Systems - Manual (Page 69)

Diverse-redundancy:
The practice of using components, circuitry or operation of different designs, architectures or functions to achieve re-
dundancy and to reduce the possibility of common mode failures.
Dual-channel:
Having redundant signal lines for each safety input or Safety Output.
Enable a mute time limit:
As soon as a mute sensor is mapped to a safety input device, a default time limit of 30s will show up in the properties
window. This time limit can be disabled by unchecking the ‘Enable Time Limit’ box. This extends the time for the muta-
ble safety device to be muted to infinite.
IEC:
International Electrotechnical Commission
Input/output mapping:
The configurable logic association, created during the configuration process, between the state of the input signals and
the corresponding state of the output signals. After an Input is assigned to control one or more outputs, it is said to have
been mapped to these outputs and that the outputs have been mapped to this input.
ISO:
International Organization for Standardization
Machine response time:
The time between the activation of a machine stopping device and the instant when the dangerous parts of the machine
reach a safe state by being brought to rest.
Manual reset:
The safety input device control operation setting where the assigned Safety Output will turn ON only after a manual
reset is performed and if the other associated input devices are in their Run state. When Manual Reset is selected, the
input device may be said to be configured to run in Latch mode; meaning that the controlled output has latched to the
OFF state and requires a manual reset to turn back ON. This reset is sometimes called a manual latch reset.
OFF signal:
The Safety Output signal that results when at least one of its associated input device signals changes to the Stop state.
In this manual, the Safety Output is said to be OFF or in the OFF state when the signal is 0V dc nominally.
ON signal:
The Safety Output signal that results when all of its associated input device signals change to the Run state. In this
manual, the Safety Output is said to be ON or in the ON state when the signal is 24V dc nominally.
Open-Closed debounce time:
Time to bridge a jittery input signal or bouncing of input contacts to prevent unwanted start of the machine. Adjustable
from 10 ms to 500 ms. Default is 50 ms. A longer open-closed debounce time will also affect the recovery time of the
Controller.
Pass-through hazard
A "pass-through hazard" is associated with applications where personnel may pass through a safeguard (which issues
a stop command to remove the hazard), and then continues into the guarded area, such as in perimeter guarding.
Subsequently, their presence is no longer detected, and the related danger becomes the unexpected start or restart of
the machine while personnel are within the guarded area.
PELV:
Protected extra-low voltage power supply, for circuits with earth ground. Per IEC 61140: “A PELV system is an electrical
system in which the voltage cannot exceed ELV (25 V ac rms or 60 V ripple free dc) under normal conditions, and
under single- fault conditions, except earth faults in other circuits.”
Qualified Person:
EZ-SCREEN® Type 2 Light Screen Instruction Manual
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