Banner EZ-SCREEN­ Safety Light Curtain Systems - Manual (Page 9)

4” describe differing requirements to ensure that appropriate safety-related performance is achieved. The appropriate type is dependent
on the overall degree of risk reduction, as determined by the machine’s Risk Assessment (see ISO 14121, ANSI B11.19, ANSI/RIA
R15.06).
A Type 2 AOPD relies on periodic testing to detect a failure to danger. Between tests, a single fault can result in the loss of the safety
function. While this level of performance and fault tolerance is generally not allowed in Category 4 situations, it is acceptable in the lower-
risk situations described by Category 2.
While the EZ-SCREEN Type 2 conducts continual internal self-tests and all single faults have been considered, the installation should
provide an additional periodic test/check of the EZ-SCREEN Type 2 and its interface to ensure the integrity of the safety function (see
Manual Reset/Remote Test Input and EDM on page 36). A component failure detected by periodic test/check must cause a “stop”
signal to be sent to the guarded machine and put the System into a Lockout condition.
Recovery from this type of Lockout condition requires:
• Replacement of the failed component (to restore the safety function)
• The appropriate reset procedure.
Operating Features
The Banner EZ-SCREEN Type 2 Light Screen models described by this manual feature standard selectable functions:
• Trip or Latch Output (depending on model)
• External Device Monitoring (EDM) via the Test/Retest input
The System Response Time (Tr) can be determined by the model number on the emitter and receiver.
Trip/Latch Output
Whether a receiver features Trip or Latch Output determines whether the System will enter RUN mode automatically after power-up, or if
it will require a manual reset first. If the System has Trip Output, other measures must be taken to prevent a pass-through hazard.
For Latch Output models, the EZ-SCREENEZ-SCREENEZ-SCREEN Type 2 requires a manual reset for the OSSD outputs to turn ON,
after power is applied and all beams are clear.
• For Trip Output models, the OSSD outputs will turn ON after power is applied and the receiver passes its internal self-test/synchroni-
zation and recognizes that all beams are clear. Trip Output models will also automatically reset after all beams are cleared.
• For Latch Output models, the EZ-SCREEN Type 2 requires a manual reset for the OSSD outputs to turn ON, whenever power is
applied and all beams are clear.
WARNING: Use of Trip/Latch Output
Application of power to the EZ-SCREEN Type 2, the clearing of the defined area, or the reset of a Latch
condition MUST NOT initiate dangerous machine motion. Machine control circuitry must be designed so
that one or more initiation devices must be engaged (i.e., a conscious act) to start the machine – in addi-
tion to the EZ-SCREEN Type 2 going into RUN mode. Failure to follow these instructions could result in an
increased risk of harm.
EZ-SCREEN® Type 2 Light Screen Instruction Manual
122452 rev. B www.bannerengineering.com - tel: 763-544-3164 9