11 Cascadeable
EZ-SCREEN LS
11.1 Overview of Cascading
EZ-SCREEN LS emitters and receivers are available in cascadeable models. These models can be used as stand-alone light
screens, or can be cascaded up to four pairs in one system. The cascaded sensor pairs can be any length, any number of
beams, or have different resolutions (14 mm, 23 mm, and 40 mm), as long as each emitter matches its receiver.
Note: EZ-SCREEN SLL.. (standard) or SLLC.. (cascadable) models can be used as the end sensor pair.
Other EZ-SCREEN components cannot be interfaced with the cascade input.
The control reliability, installation and alignment, electrical interface to the guarded machine, initial checkout, periodic
checkout, troubleshooting and maintenance features of cascadeable models are functionally identical to those of the
standard models.
Make a cascade interconnection by using the double-ended removable disconnect DELS-11..E cordsets. Make
connections for optional EZ-LIGHT indication (integral or remotely located), interfacing to an E-Stop button or Interlocking
switches (hard contacts), and remote fixed blanking at the end receiver or with an individual cascade receiver; see
on page 80. All receivers in a cascade activate the same set of OSSD outputs: the OSSDs of the master receiver.
Note: In a cascaded system, all receivers are connected together, and all emitters are connected together.
Cascaded sensors are configured automatically.
WARNING: Scan Code
In situations where multiple systems are mounted closely together, or where a secondary emitter is in
view (within ±5°) and within range of an adjacent receiver, the adjacent systems must be configured for
different Scan Codes (one system set for Scan Code 1 and the other for Scan Code 2). If not, a receiver
may synchronize to the signal from the wrong emitter, reducing the safety function of the light screen.
This situation is discovered by performing the trip test. Failure to follow these instructions could result in
serious injury or death.
Figure 42. Light screens guarding a robotic cell
Figure 43. Cascaded light screens guarding a u-shaped cell
EZ-SCREEN
®
LS Safety Light Screen
70
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