Rockwell Automation 45MLA Controller Installation Instructions - Manual (Page 7)

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The 45MLA is designed to work with a range of at least 4 m. As a
result some translucent targets may not block enough light to be
properly detected, especially if the emitter and receiver arrays are
placed closer together. With the Basic Controller model it is
possible to use DIP switches to decrease the emitter intensity,
therefore making it easier to detect translucent objects. The
emitter intensity may be set to full power (default setting), 75% of
full intensity power, 60%, or 15% by using a combination of DIP
switches 1 and 2 according to the above table.
It is possible to configure the Basic Controller to ignore short
beam interruptions, such as those caused by small particles
passing through the detection area. The double-scan mode can
be enabled by turning on DIP switch four (and cycling power). In
this mode every beam is evaluated twice (instead of once) and
only beams that are interrupted during both evaluations are
recognized. This allows very brief beam interruptions to be
ignored. The response time is increased. When the double-scan
mode is enabled, the minimum duration of detection can be
made even longer with the use of potentiometer one. This
additional time delay can range from 0…3.3 seconds.
Teach Instructions
The Basic Controller offer the ability to teach blanked zones which
are not evaluated during operation. The user can either configure
blanked zones at one or both ends of the array (for example if the
arrays are too long for the application); OR one blanked zone in
the middle of the array (if an area in the middle is too be ignored).
To activate the teach capability DIP switch three must be turned
ON (and controller power cycled) to enable the remote teach.
Once the remote teach is enabled, the teach process is initiated by
turning the discrete input In one ON. Interrupt the beams/zones
that are to be ignored and turn the input IN one OFF. The beams
that are interrupted while In 1 changes from ON to OFF will
determine the blanked zones.
The blanked zones can be reset with DIP switch eight or by doing
the teach process again.
Notes on the teach process:
• There cannot be any “holes” in a single blanked zone—all of
the beams must be interrupted to define the zone.
• The first blanked zone is defined from the first interrupted
beam to one less than the first beam that is not blocked. (Beam
counting direction is determined by DIP switch six, with the
default standard beam counting starting from the cable end of
the array.) If (and only if ) the first blanked zone starts with
Beam one, a second blanked zone can also be set up. The zone
is defined as starting with the next interrupted beam (after the
first uninterrupted beam) all the way to the end of the array,
regardless of which other beams are interrupted.
• For best results, confirm that all beams in the blanked zone are
completely blocked. Also if two blanked zones are being set up
confirm that the first zone includes beam 1 (based on the
beam counting direction determined by DIP switch 6).
Functional Description—I/O Model
Figure 5: I/O Model
This model of the controller extends the functionality of the
45MLA to offer four additional output signals as well as a teach
function. These outputs can be allocated to specific zones or
single beams on the light array.
Pin Listings
The allocation of pins on the main connector, J2, is specified
below.
Table 12: J2 Pin Listings
Pin Signal Description Remarks
1 0V DC Power —
2 +24V DC Power —
3 Ground Ground —
4 Not connected Not connected —
5 In 2
Trigger and hold DIP switch S1 (7) = 0
Overhang back sensor DIP switch S1 (7) = 1
6 In 1
Not used DIP switch S1 (7) = 0
Overhang front sensor DIP switch S1 (7) = 1
7 Out 2 Light array interrupted 
0V DC = interrupted
24V DC = not interrupted
8 Out 1 Overhang
0V DC = overhang
24V DC = no overhang
 Or over-height (special function)
In 2
PNP
NPN
PNP
NPN
D7 LED - Power
I/O
Extension
PCB
D3 LED Out 1
D4 LED Out 2
D6 LED In 2
D5 LED In 1
D13 LED
D14 LED
D12 LED
D11 LED
D10 LED
RJ45 Connector
Emitter
RJ45 Connector
Receiver
D2 LED
D1 LED
In 1
Pot 2
Pot 1
Teach
Push-
Button
Removable
Spring-Loaded
Connector
Input
Logic
Jumpers
S1
J2
J14
Out 1
Out 2
In 1
In 2
n. c.
Earth.
24 VDC
0 VDC