Rockwell Automation Publication 445L-IN005A-EN-P - May 2018
5
GuardShield Micro 400 Safety Light Curtains
The protective field is between the bottom of the top end cap and the
area above the status LEDs.
The width of the protective field is derived from the distance between
transmitter and receiver. The distance must not exceed the maximum
rated width of the protective field 0…5 m (0…16.4 ft).
Cascading
The GuardShield, Micro 400 POC is also available in cascading
segments which allow a number of GuardShield Micro 400 transmitters
and receivers to be interconnected. This product configurability allows
the GuardShield Micro 400 to help protect multiple sides of a machine
or simply adds flexibility when positioning the GuardShield Micro 400
in various applications.
Figure 2 - Up to Three GuardShield Micro 400 Segments Can Be
Interconnected. See the Following Text for Limitations.
Standard GuardShield Micro 400 cascading segments are offered in
protective heights from 150…1200 mm (5.91…47.2 in.) in both 14 mm
(0.55 in.) and 30 mm (1.18 in.) resolutions.
A maximum of three GuardShield Micro 400 light curtains can be
interconnected (maximum two cascades plus one standard GuardShield
Micro 400). The maximum number of beams in a cascading system is
255 beams. The individual segments can have mixed resolutions as long
as the pairs have the same protective heights and resolutions. The
maximum cable length from the control unit to the last beam can be 10
m (32.8 ft).
Cascading segments cannot be used as standalone light curtain pairs.
However, if using multiple cascaded pairs or only one, the last pair in the
cascaded system must be a standard GuardShield Micro 400 light
curtain.
Consider the following limitations:
• A maximum of 255 light beams per controller
• 10 m (32.8 ft) maximum total length for light curtains,
extension modules, and connection cable combined (
Figure 2
)
• Only a Rockwell Automation® patchcord (445L-AC8xxx) can
be used between the light curtains and the controller. A
patchcord is required to connect the M12 connector of the
Micro 400 to either the MSR41 or MSR42 controller. The
patchcord has an 8-pin M12 on one end and an RJ45 connector
on opposite end.
Examples of Range of Use
The GuardShield Micro 400 safety light curtain operates as a proper
protective device only if the following conditions are met:
• The control of the machine must be electrical.
• The controlled machine must be able to be stopped anywhere in
the machines stroke or cycle.
• The transmitter and receiver must be mounted such that access
to the hazard is only through the light curtain protective field.
• If used as an access device, the restart button must be located
outside the hazardous area. This location helps to prevent the
start-up of machinery while personnel are inside the hazardous
area.
• The statutory and local rules and regulations must be observed
when installing and using the device.
Safety Functions
The GuardShield Micro 400 safety light curtain offers various
functions, which are integral to the system.
Operating modes, functions, and features of the GuardShield system are
activated through hardware or software of the corresponding connected
MSR41 or MSR42 controller. For details, see the manual of the attached
controller.
Response Time
The standard response time of the light curtain (see MSR42)is dependent
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 can be faster and
can be taken from the corresponding configuration control document,
created from the configuration software of the corresponding safety
controller (for example, 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.
Patchcords
Last segment pair
must be a standard
Micro 400 pair
IMPORTANT
Additional measures can be necessary to confirm that the ESPE
does not fail to danger when other forms of light radiation are
present in a particular application (for example, 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 every change to the configuration.