Rockwell Automation 445L GuardShield Micro 400 Safety Light Curtain User Manual - Manual (Page 9)

R
GuardShield™ Micro 400 Safety Light Curtain User Manual
7
Original instructions
Safety Functions
The GuardShield Micro 400 safety light curtain offers a variety of
functions, which are integral to the system.
Operating modes, functions and features of the GuardShield
system are activated through HW or SW of the corresponding
connected MSR41 or MSR42 controller. For details, please refer to
the manual of the attached controller.
Response Time
The standard response time of the light curtain (see MSR42)is
dependant on the physical resolution and the protective height and is
shown on the product label. The actual response time depends on
the connected control unit and its configuration. The response
time may be faster and can be taken from the corresponding
configuration control document, created from the configuration
software of the corresponding safety controller (e.g., MSR42).
The total light curtain system response time for a cascaded
system is the sum of the response times of each cascade plus the
response time of the standard light curtain. The declared
response times are worst case values.
A worst case response time is printed on the product label or in
the GuardShield Micro 400 Products section:
Example of the total response time of a cascaded light curtain:
Table 1:
The response time printed on the product label reflects the
double scan mode of the MSR41 and MSR42 controller.
A detailed explanation, including the corresponding safety
information, for configuring a MSR42 controller module may be
found in the "Configuration Tool" program manual.
Parameters which may lead to an increased response time:
• Stop delay time
• Blanking
• Muting
• Using an MSR45E relay expansion module
Blanking
There are some industrial applications where material must be fed
through the protective field (e.g., textile machines or small
assembly machines). This movement of material through the
GuardShield Micro 400’s sensing field in the standard safety mode
would result in an interruption and therefore bring the machine
to an unwanted stop. To avoid this it is possible to blank out
certain beams. This operating mode is generally known as “Fixed
Blanking.” Blanking functionality is available with the MSR42
controller and requires the optical interface module to program
this functionality.
With a MSR42 safety controller and an Optical Interface
(445L-AF6150) it is possible for authorized personnel to activate
different blanking modes. Blanking modes are broken down into
the following categories:
• Fixed blanking
• Floating blanking
t
LC
Response time of the standard Micro 400 light
curtain
t
C
Response time of the control unit (e.g., MSR42)
including any connected MSR45 relay modules
t
Nx
Sum of response times t
Nx
of all additional
connected GuardShield Micro 400 light curtain
cascades (x = 1 or 2)
Description Length/Resolution
Response time
Cascade 1 (t
N1
) 1200/14 mm 41.9 ms
Cascade 2 (t
N2
) 300/14 mm 18.5 ms
Standard (t
LC
) 600/14 mm 26.3 ms
System (t
LC
+ t
C
+ t
N
) 1200/14-300/14-600/14 mm 88.7 ms + t
C
IMPORTANT
Additional measures may be necessary to
ensure that the ESPE does not fail to danger
when other forms of light radiation are present
in a particular application (i.e., use of cableless
control devices on cranes, radiation from weld
spatter or effects from strobe lights).
IMPORTANT
The protective system must be tested for
proper operation after each and every change
to the configuration.
IMPORTANT
The response time of the GuardShield Micro 400
light curtain system is dependent on the
operating mode of the connected safety controller.
With the help of an optical interface (445L-
AF6150) it is also possible, to delay the response
time of the connected safety light curtain
system, when the GuardShield Micro 400 is
connected to the MSR42 controller.
If a controller unit is reconfigured, a new
configuration control document must be
printed and has to be kept close to the
controller. Also the corresponding control unit
has to be marked with the provided label.
IMPORTANT
When making changes to the configuration of
the GuardShield Micro 400 system, it is
necessary to recalculate the safety distance and
potentially relocate the GuardShield Micro 400
light curtains at the proper distance from the
hazard.
IMPORTANT
The device can be operated in a fixed and/or
floating blanking mode if an MSR42 controller
is used. The resolution will increase according
configuration control document. The light
curtain stick has to be clearly labeled with the
configured resolution.