8 Cascadeable
EZ-SCREEN Safety Light Screen
8.1 Overview of Cascading
EZ-SCREEN emitters and receivers are also available in cascadable models. These models can be used as stand-alone
light screens, or can be cascaded up to four systems. The cascaded sensor pairs can be any length, any number of beams,
or have different resolutions (14 mm and 30 mm), as long as each emitter matches its own receiver.
Special cabling is not required, but the double-ended 22 awg cordsets are recommended. Pigtail QD models may be used
to reduce the number of required cables. Response time is dependent on the number of beams in the light screen and the
light screen’s position in the cascade. Maximum system response time can be calculated easily for these cascaded
systems, in two ways:
• Individually for each light screen in the cascade (separation distance is calculated for each light screen in the
cascade), or
• Based on the worst-case maximum for the entire cascade (all light screens in the cascade have the same separation
distance).
Figure 28. Cascaded light screens guarding two areas of one machine
The receivers are shown using the EZA-MBK-21 "L" mounting bracket.
Note: EZ-SCREEN SLS models (with Inverted Display) can be used as the end sensor pair.
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. Electrical connections are made through M12 (or Euro-style) quick-disconnects. The emitter has an 8-pin
connector for power and ground. Optional 5-pin emitters with Remote Test function are available; see note at right.
The receiver has an 8-pin connector for power, ground, reset, EDM #1 and #2, and OSSD #1 and #2. All systems in a
cascade are activating the same set of OSSD outputs, which are the OSSDs of the master receiver.
Note: In a cascaded system, all receivers are connected together, and all emitters are connected together.
8.2 System Components and Specifications
A stand-alone cascadeable EZ-SCREEN system includes a compatible emitter and receiver (equal length and resolution;
available separately or in pairs), a terminator plug for the receiver and two single-ended (machine interface) cables.
A multiple-light screen cascaded EZ-SCREEN system includes compatible emitter/receiver pairs (up to four), a terminator
plug for the last receiver in the cascade, two single-ended cables to interface with the machine and provide power to the
system, and pairs of double-ended (sensor interface) cables to interconnect the emitters and the receivers in the cascade.
The terminator plug must be used on the receiver in a stand-alone system, and on the last receiver in a multiple-system
cascade or, a QDE2R4-8..D cable interfaced with an E-stop or other hard contacts (see
Positive-Opening Interlocking Safety Switches
on page 74).
EZ-SCREEN
®
14/30 mm Safety Light Screen
62
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