Rockwell Automation 442L SafeShield Safety Light Curtain Hardware User Manual
Page 8
SafeShield Safety Light Curtain Hardware User Manual
8
Table 1: Special features and configurable functions of the SafeShield
safety light curtain.
The Light Curtain Principle
The SafeShield safety light curtain consists of a sender and a
receiver (Figure 1). Between these two units is the protective field,
defined as the protective field height and the protective field width.
The construction height determines the height of the protective field
of the appropriate system. For the exact protective field height,
please see Table 30 on page 39.
The width of the protective field is derived from the dimension of the
light path between sender and receiver and must not exceed the
maximum rated width of the protective field (see “Technical
Specifications on page 35).
Sender and receiver automatically synchronize themselves optically.
An electrical connection between both components is not
required.
The SafeShield safety light curtain is modular in construction. All
optical and electronic components and assemblies are housed in a
slim and torsionally rigid housing.
Cascading
To provide effective point-of-operation protection, a maximum of
three SafeShield safety light curtains can be connected in series in a
cascaded configuration.The device connected to the control
cabinet is the main sensor, called Host. The subsequent sensors are
called Guest (see Figure 1 on page 7).
Benefits of Cascading
• No additional external circuitry required
• Resolution and protective field height may differ among the
individual systems
Function That Can Be Configured
SafeShield Safety Light Curtain
Without Cascading
Connection
With Cascading
Connection
Special Features
Emergency stop can be connected to the
device
"
Reset button can be connected directly to
the device
#
"
# = On devices without an extension connection,
these functions can be accessed using the terminal
strip in the control cabinet from the system
connection for the SafeShield safety light curtain!
Output for “Reset required” on the device
#
"
Signal output (ADO)
"
"
External device monitoring (EDM)
"
"
Reduced resolution
"
"
Blanking
"
"
Teaching in blanked areas
#
"
# = Only in conjunction with SafeShield function
module
PSDI mode
#
#
Bypass
#
#
Operating mode switching
#
#
Limits of Cascading
• The maximum protective field width must be guaranteed for each
individual system!
• The maximum total number of beams must not exceed 480
beams in noncoded operation, and a maximum of 405 beams in
coded operation.
• The maximum cable length between two cascaded systems must
not exceed 3 meters.
Recommendation
With the exception of the last guest, for cascading you will require
devices with an extension connection. It is worthwhile choosing
devices with an extension connection because the extension
connection provides additional possible connection methods and
facilitates a significant reduction in the wiring effort.