6
Light Curtain Multi-Function Control Module User Manual
Or
i
g
i
nal
i
nstruct
i
ons
Earth connect
i
on
The earth of each MSR42 control module is realized through the
connection to the mounting rail. Consequently it is important to ensure,
that the mounting rail has a good earth connection.
M
i
cro400 l
i
ght curta
i
n
The two RJ45 sockets on the lower portion of the control module are for
the connection of Allen-Bradley GuardShield Micro400 (white = E =
emitter; blue = R = receiver). To help protect the RJ45 connectors the
cables have to be snapped into the provided cable holders at the.MSR42
housing.
Start
m
ode
The MSR42 can be configured to have the following start modes:
• automatic start or
• manual start.
In case of the basic configuration the start mode can also be configured
without the configuration software. By conn24V to GPI03 and
GPI04, automatic reset is enabled (see wiring diagrams).
Manual start
When all of the inputs of the safety system have a safe signal, depressing
the start button will cause the two safety OSSD outputs to change from
low to high. If a MSR45E relay expander module is connected, it will
close. If more than one safety component is configured, then all
components must have safe signals to all inputs before a start is allowed.
The start button is monitored to prevent an unintentional start. Pulse
length must be between: 50 ms and 5 sec. If the start impulse is longer or
shorter, the start input will be ignored by the device. The configuration
control document identifies which terminal the start button is connected
to. If the start button is connected to IN1or IN2 then a red LED
indicates that a start signal is present, a green LED indicates no signal is
present.
Table 4
Warning: Important safety advice:
Automatic start
If a safety component is configured for “automatic start”, then, after the
activation and the deactivation of the safety component, the two OSSD
outputs will change automatically from low to high again and if
connected the MSR45E expander relay contacts will automatically re-
close.
M
i
n
im
u
m
o
ff
t
im
e
According to the standard IEC 61496-2 a safety light curtain must have a
minimum safety output off time of 80 ms. This means that even in the
case of a very short safety light curtain interruption, the safety outputs
will stay low (Relays = open) for 80ms at minimum. A start signal will
only be recognized after the 80ms duration.
EDM or start release
If an MSR42 is used with external relays or contactors, the contacts of
that device must be monitored. An example category 4 application has
two external contactors, each with force guided contacts must be
inserted. For monitoring the function of these contactors, each relay
block must have at least one normally closed contact which is fed back in
series to IN2 (or IN1 depending on configuration) of the MSR42
control module (e.g. Figure 4).
Two options are possible for this monitoring:
1. Start release: The signal at the corresponding input terminal must be
high before the start button is pressed (this means: the normally closed
contacts of the external relays must be closed before allowing a start). The
option “start release” is pre-configured in the MSR42 control module
(440R-P226AGS-NNR) (e.g. Figure 4).
2. EDM (external device monitoring): The input signal of the EDM
terminal is always monitored. This means: not only at the beginning
before a start the signal must be correct. Also after the start a signal
change must happen, otherwise an emergency stop occurs. If a high signal
is present for longer than 5 seconds, a lock-out will occur.
If the configuration control document shows that EDM or start release
must be attached to terminal IN 1 or IN 2, then the meaning of the
respective LED is shown below.
Table 5
The start release or EDM input is not cross-fault monitored and
therefore not a safety input.
Terminal
LED green
LED red
IN 1 or IN 2
No start signal present
Start signal present (button pressed)
It is fundamental that the start button be
mounted so that the danger area is clearly
visible. That is, when pressing the start
button it must be guaranteed that no one
is detained within the danger area.
According to EN 60204 article 9.2.4.4.2 a
system may not automatically restart,
even after the cause of the shutdown has
been eliminated and thereby another
danger may still exist to the operator. If
the MSR42 control module is configured
with an “automatic start”, this
requirement must be fulfilled by further
measures.
Terminal
LED green
LED red
EDM at IN 1 or IN 2
EDM signal okay
EDM signal wrong
Start release at IN 1 or
IN 2
Start release signal okay
Start release signal wrong