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DMD Page 21
1 Contents
1 Contents.........................................................................................................................................21
2 Introduction ...................................................................................................................................23
2.1 User note.................................................................................................................................23
2.2 Safety instructions.................................................................................................................23
2.3 Equipment display .................................................................................................................23
2.4 Handling instructions ............................................................................................................23
2.4.1 Use in accordance with regulations .............................................................................23
3 Operation Startup..........................................................................................................................24
3.1 DIP Switch Settings ...............................................................................................................24
3.1.1 DIP Switch Settings:.......................................................................................................25
3.2 Replacement EDM ⇒ DMD:...................................................................................................27
3.3 LED display.............................................................................................................................27
3.3.1 Function Display.............................................................................................................27
3.3.2 Diagnosis Display Profibus DP .....................................................................................27
3.3.3 Diagnosis Display Interbus-S........................................................................................28
3.3.4 Diagnosis Display SSI ....................................................................................................28
3.3.5 Front LED.........................................................................................................................28
4 Installation Instructions................................................................................................................29
4.1 Interfaces and connection assignment ...............................................................................29
4.1.1 Connection assignment of the 14-pin and 4-pin screw terminals.............................29
4.1.2 Description of the SSI Interface ....................................................................................30
4.1.3 Description of the Profibus DP Interface .....................................................................31
4.1.4 Description of the Interbus-S Interface ........................................................................31
4.2 Alignment Instructions..........................................................................................................32
4.3 Reflector Arrangement ..........................................................................................................33
4.4 Reflective tapes......................................................................................................................35
4.4.1 Diamond Grade ...............................................................................................................35
4.4.2 PL 240 DG........................................................................................................................35
4.4.3 PL 560 DG........................................................................................................................35
4.4.4 PL 880 DG........................................................................................................................35
5 Troubleshooting............................................................................................................................36
6 Specifications................................................................................................................................37
7 Accessories ...................................................................................................................................38
7.1 Lens reflector PL 140L ..........................................................................................................38
7.2 Mounting bracket for lens reflector BEF-PL 140L ..............................................................38
Page 22 DMD
7.3 Deflecting reflector for DMD USP-DMD ...............................................................................39
7.4 Mounting bracket for DMD BEF-WN-DMD (supplied with equipment).............................39
8 Dimensional drawing ....................................................................................................................40
9 Maintenance...................................................................................................................................40
DMD Page 23
2 Introduction
2.1 User note
The DMD is a compact optical distance sensor. It measures the distance to reflective tape according
to the principle of pulse length measurement (operating time measurement). Reflective tape is always
in the field of vision of the sensor and moves in the optical axis of the light beam. Typical applications
include the positioning of vehicles that run on tracks such as shelf operating equipment or cranes.
2.2 Safety instructions
The radiation emitted by a class 1 laser is harmless. Anyone can operate this type of laser instrument
(e.g., laser beam in CD players).
! No safety component according to EU machine regulations
! Read the operating instructions before operation startup
! Connection, mounting and setting only by skilled technicians
! Protect the equipment against humidity and soiling at operation startup
! Suitable ESD protection measures at installation
2.3 Equipment display
Diagram 1: Equipment view
2.4 Handling instructions
2.4.1 Use in accordance with regulations
The distance measurement equipment DMD is an optoelectronic sensor and is used for optical,
contactless detection of reflective tape or reflectors.
Page 24 DMD
3 Operation Startup
3.1 DIP Switch Settings
The red front LED switches off after approx. 10 seconds if the DMD is aligned to a reflector.
Allow for a warming up phase of approx. 30 minutes to achieve the given preciseness. Then the DMD
is ready to measure.
The sensor is tested and calibrated before delivery. It can be put into operation immediately
After the housing cover is removed, the measurement mode can be set using the eight DIP switches.
Diagram 2: Fixing screws for removing the housing cover.
Diagram 3: View of the inside with DIP switches
The selection of the modes depends on the application.
Application e.g., distancing of
bridge cranes (2-point
controls)
e.g., fast closed-loop
position control
Measurement time/ms 50 25 13
Measurement number 512 256 128
Switching possible to
higher measurement
number
2048 2048 1024 2048 1024
Mode
0
1)
12
2)
345 6 7
DIP switch settings
on
off
2, 3, 4 2, 3
4
2, 4
3
2
3, 4
3, 4
2
3
2, 4
4
2, 3 2, 3, 4
Table 1: Modes dependent on application
Profibus address 1
Profibus address 10
DIP switch operating mode
DMD Page 25
Notes:
! Measurement time: Time during which a new measurement value feeds the interface dependent
on the measurement number
! Measurement number: Number of measurement values used for calculating an average value
! A higher measurement value number is switched to internally when there is a slower target change
1)
Mode 0: Position achieved holds the window (PEH) in the control (type 3 mm - 5 mm,
system-dependent)
2)
Mode 2: When the target stops, the last valid measurement value is output.
3.1.1 DIP Switch Settings:
General Information:
!
DIP switch 1 must always be set to ON
! DIP switch 5 must always be set to ON
!
DIP switch 6 is only active with an SSI interface; otherwise it has no influence
ON: SSI output gray-coded
OFF: SSI output binary
! DIP switch 7:
The data output can be changed in all measurement modes:
ON: Output with 1 LSB corresponds to 0.1 mm
OFF: Output with 1 LSB corresponds to 1 mm
!
DIP switch 8 is not assigned
ON
OFF
12345678
Only the DIP switches 2, 3 and 4 determine selection of the corresponding measurement
mode! The mode can be determined from Table 1.
DMD Page 27
3.2 Replacement EDM ⇒ DMD:
EDM DMD
Mode 0 ⇒ Mode 0
Mode 1 ⇒ Mode 3
Mode 2 ⇒ Mode 1
Mode 3 ⇒ Mode 2
3.3 LED display
Diagram 4: Sensor view with view window with LED
3.3.1 Function Display
! Green LED lights: Target (reflector) detected
! Red LED lights: Target (reflector) not detected
The operating display is contained in all variants.
3.3.2 Diagnosis Display Profibus DP
! Green LED external: No function
! Green LED in the middle lights: Profibus initialized successfully
! Red LED: No function
ON
OFF
1234
ON
OFF
1234
ON
OFF
1234
ON
OFF
1234
ON
OFF
12345678
ON
OFF
12345678
ON
OFF
12345678
ON
OFF
12345678
Page 28 DMD
3.3.3 Diagnosis Display Interbus-S
! Green LED external lights: Interbus initialized successfully
! Green LED in the middle lights: Data transfer to Interbus
!
Red LED lights: Interbus not available or not initialized
3.3.4 Diagnosis Display SSI
!
None
3.3.5 Front LED
The front LED lights during initialization of the equipment after switching on the power supply and
switches off after approx. 10 seconds (if aligned to a target). If the target is lost, the front LED also
lights during operation; it is connected with the red LED of the function display. In this case, the
Errorbit is set after 400 ms.
DMD Page 29
4 Installation Instructions
4.1 Interfaces and connection assignment
4.1.1 Connection assignment of the 14-pin and 4-pin screw terminals
14-pin screw terminal (X2, X3)
Pin SSI Profibus DP Interbus-S
1
2
3COM2
4DI2
5/DI2
6DO2
7/DO2
8 CLK - P (B) DI1
9CLK + N (A) /DI1
10 DATA - DO1
11 DATA + /DO1
12 P (B)
13 N (A)
14 GND COM1
4-pin screw terminal (X4)
Pin SSI Profibus DP Interbus-S
1
+24 V DC (pot. free) +24 V DC (pot. free) +24 V DC (pot. free)
2
+24 V DC (pot. free) +24 V DC (pot. free) +24 V DC (pot. free)
3
GND (24 V) (pot. free) GND (24 V) (pot. free) GND (24 V) (pot. free)
4
GND (24 V) (pot. free) GND (24 V) (pot. free) GND (24 V) (pot. free)
Diagram 5: Plug cover for all interfaces
Page 30 DMD
Overview
! A high-frequency technical (shield braid) connection must be established between the housing
mass of the DMD (screw terminal X5) and the metal structure of the system for every interface type
to suppress electromagnetic interference. The connection should be as short as possible.
4.1.2 Description of the SSI Interface
A 100Ω load resistance (0.5 W) must be connected to the control computer between Data + and Data
- if this resistance is not already integrated in the interface card. The cable shield may only be fit into
the control unit (on the housing of the plug). Shielded twisted wire pairs are recommended for a
reliable data transfer.
Data telegram:
LS
B
MSB SSI
Error
Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
SSI Daten
One start bit, 24 data bit gray-coded or binary (low byte first, followed by middle and then high-byte)
and one Errorbit are transmitted. The Errorbit is set (high) as soon as the target is lost (laser beam no
longer on the reflector). In this case, the front LED and the red LED of the function display light.
Binary coding
Bit 24: Error bit: 1 = loss of target or no echo; 0 = OK
Bit 0...23: SSI data binary-coded with 0.1 mm or 1 mm resolution
(dependent on DIP switch 7)
Gray coding
Bit 24: Error bit: 1 = loss of target or no echo; 0 = OK
Bit 0...23: SSI data gray-coded with 0.1 mm or 1 mm resolution
(dependent on DIP switch 7)
tv = Response time for the 1st clock: max. 540 ns; for all others: max. 360 ns
Gn = Highest value bit in gray-coding
T = Length of clock signal
G0 = Lowest value bit in gray-coding
tm = Monoflop time µs
Clock
Serial data
SSI clock rate: 125 kHz – 1 MHz -> T = 1 µs – 8 µs
DMD Page 31
4.1.3 Description of the Profibus DP Interface
The last Profibus participant must be terminated with terminal resistances. The switch S2 must be set
to 1 in the plug cover (resistance combination switched on). If it is a question of a slave, which is not
connected to the bus as the last participant, the S2 switch should be set to 2 (resistance combination
switched off) (Diagram 5).
The Profibus slave address should be set using the two rotary knobs on the housing back wall of the
DMD (Diagram 3). A standard Profibus cable has to be used.
The cable shield must be fit on both sides. The screw terminal X5 should be used in the plug cover
here. The cable shield should be connected as short and possible and not twisted to terminal X5.
Data telegram:
Byte 0Byte 1Byte 2Byte 3
7 0 7 0 7 0 7 0
Distance low Distance middle Distance high Error
↑
4.1.4 Description of the Interbus-S Interface
If an Interbus participant is not the last in the chain, a bridge must
be set between RBST and the
internal +5V voltage. The switch S1 must be set to 2 in the plug cover (RBST internally at + 5V). If the
participant is connected as the last device in the chain, the switch S1 must be set to 1 (RBST
internally via a resistance at GND) (Diagram 5).
The cable shield must be fit on both sides. The screw terminal X5 should be used in the plug cover
here. The cable shield should be connected as short and possible and not twisted to terminal X5. A
standard Interbus cable has to be used.
Data telegram:
Byte 0 Byte 1 Byte 2 Byte 3
7 0 7 0 7 0 7 0
Distance low Distance middle Distance high Error
↑
In the default setting, 4 bytes are transmitted binary. Bytes 0 to 2 contain the distance measurement
value (sequence: Low, Middle, High). Byte 3 contains the Errorbit (refer to SSI for the significance) in
Bit 0 (lowest value bit).
Page 32 DMD
4.2 Alignment Instructions
Note that the laser pointer is placed offset to the side of the measuring optics during alignment. The
alignment applies to both reflector types (tape and lens reflector) and should be made at the
maximum measurement distance.
Align the equipment so that the middle point of the laser pointer spot is 26 mm horizontally and 16 mm
vertically from the middle point of the reflector (Diagram 6). The alignment according to Diagram 6
requires the equipment to be installed as in Diagram 7 above.
After the supply voltage is switched on, the laser point blinks for at least 60 seconds. If the sensor is
aligned accurately, the laser pointer switches off after 60 seconds. If there is a loss of target, the laser
pointer continues to blink. The laser pointer can be switched on either by switching the supply voltage
off and on or by simulating the loss of target (e.g., by interrupting the beam).
Measurement beam
lighted spot (invisible
to the human eye)
Laser pointer
lighted spot
(red)
Reflective tape
Diagram 6: Reflective tape
DMD Page 33
4.3 Reflector Arrangement
DMD side view
DMD view from above
DMD view from above
Measurement beam diameter: approx. approx. approx. approx.
5 cm 10 cm 30 cm 70 cm
Re
f
lective tape
500x500
R
e
fl
ect
i
ve tape
1000x1000
Lens reflector
Reflective tape
Lens reflector
Diagram 7: Reflector arrangement 1
Page 34 DMD
Minimum arrangement at distances
> 120 m to 240 m (2 x lens reflector PL 140L)
Fresnel lens
Fresnel lens
Fresnel lens
Fresnel lens
Fresnel lens
Fresnel lens
Fresnel lens Fresnel lens
Fresnel lens
Recommended arrangement with horizontal
deflection of the measurement beam due to
uneven movement
Recommended arrangement with horizontal and
vertical deflection of the measurement beam due
to uneven surfaces and movement
approx. 20 cm
approx. 20 cm approx. 20 cm
approx. 20 cm
approx. 20 cm
approx. 20 cm
approx. 20 cm
Diagram 8: Reflector arrangement 2
DMD Page 35
4.4 Reflective tapes
The reflector size should be selected so that the light spot does not move from the reflector due to
vibrations. For example, if the DMD is rotated by 1 degree, the light spot moves by approx. 2 m at a
distance of 130 m.
4.4.1 Diamond Grade
Can be made to order, max. 749 mm x 914 mm, Order no.: 4 019 634
4.4.2 PL 240 DG
280 mm x 280 mm, Order no.: 1 017 910
4.4.3 PL 560 DG
605 mm x 605 mm, Order no.: 1 016 806
4.4.4 PL 880 DG
914 mm x 914 mm, Order no.: 1 018 975
Page 36 DMD
5 Troubleshooting
Problem Possible cause Solution
! Red LED in front window
lights longer than 10 sec.
! Measurement target not
detected
! Reflector or equipment pane
soiled
! Measurement area exceeded
! Check alignment
! Red operation LED lights ! Measurement target not
detected
! Reflector or equipment pane
soiled
! Check alignment
! Red & green operation
LEDs light
! Not ready to measure;
equipment is possibly defect
! Replace equipment
! Measurement error at
slight distances
! Reflector is not inclined ! Inclination angle
!
Increase of the
measurement error at
increasing distances
!
Laser does not hit reflector
!
Check alignment
! No LED lights: ! No operating voltage
!
Reverse polarity of operating
voltage
! Check secure attachment
of housing cover
! Check wiring
!
Sporadic measurement
value jumps
!
Electrostatic influences
! Ground loop
!
Connect shielding
according to installation
instructions
! Connect housing with
system ground
! Measurement error at
specific positions
! Loss of target; laser does not hit
reflector
! Check path of objects to
be detected for
substantially uneven
spots; increase the size of
the reflector if necessary
! System vibrations ! Switching off noise has an
unfavorable effect on the control
behavior
! Change the measurement
mode
! Noise at achieved position ! Measurement value noises not
compatible with the control
! Change the measurement
mode
! Substantial measurement
error
! Measurement of false target
(galvanized or bright objects
close by are detected as target)
! Paint reflecting objects or
remove them
! Double amount of the
measurement value
! Sporadic setting of the
error bit
! Bit displacement at reading ! Check software
! Lay data and power
supply cables separately
(for Tyristor control)
! Check the connection of
the clock cables (Caution!
Switch off the cables of
the motor voltage if you
make a replacement.)
! Position error in the Y axis
with heavy loads
! Postoscillation of the lifting table ! Reduce brake delay
DMD Page 37
6 Specifications
Specifications
DMD
50-
1111
50-
2111
50-
3111
120-
1111
120-
2111
120-
3111
240-
1111
240-
2111
240-
3111
Interfaces
SSI GRAY/BINARY
1)
Profibus-DP, 4 byte incl. Errorbit
Interbus-S, 4 byte incl. Errorbit
Measurement range
2)
0.5 m ... 50 m
0.5 m ... 120 m
0.5 m ... 240 m
Accuracy
3) 4)
0.5 m ... 3.2 m ± 6 mm
> 3.2 m ± 5 mm
Reproduceability
5)
0.2 mm at 50 ms measurement
value time
2 mm at 13 ms measurement value
time
(Statistical error 1
σ
)
Light spot diameter 10 cm at 30 m distance
30 cm at 100 m distance
70 cm at 240 m distance
Resolution 0.1 mm/1 mm (switchable)
Light source
6)
, light type
Laser diode, infrared
Laser protection class
1 (EN 60825)
Supply voltage U
V
DC 18 ... 30 V
7)
Power consumption
≤
8 VA
Connection type
Terminal connection 4 x PG 9
VDE protection class
8)
III
Protection circuits
9)
A, C
Enclosure rating
IP 65
Ambient temperature
Operation – 0 °C ... + 40 °C
Storage – 25 °C ... + 75 °C
Weight
3 kg
Profibus-DP
max. 1.5 MBaud
Air pressure influence
0,3 ppm/hPa
Temperature influence
0.3 mm/K
Measurement value output
SSI: 1 ms, clock 125 kHz ... 1 MHz
Profibus: 1 ms
Interbus: 1 ms
Initialization time
Approx. 10 s
Max. speed of objects to be
detected
10 m/s
1)
Settable 25 bit incl. Errobit
2)
With respect to equipment zero
point
3)
23° air temperature, 977 hPa,
min. operating time 30 min.
4)
Recalibration after 25.000 h
recommended
5)
Ambient conditions constant,
minimum operating time 30 min.
6)
Average service life 100,000 h
at T
U
= + 25 °C
7)
Limit values
8)
Withstand voltage 50 V
9)
A = U
V
connections reverse-polarity
protected
C = Interference pulse suppression
Page 38 DMD
7 Accessories
7.1 Lens reflector PL 140L
Order number: 5 308 918
7.2 Mounting bracket for lens reflector BEF-PL 140L
Order number: 5 308 917
DMD Page 39
7.3 Deflecting reflector for DMD USP-DMD
Order number: 5 308 919
7.4 Mounting bracket for DMD BEF-WN-DMD (supplied with equipment)
Order number: 5 308 915
Page 40 DMD
8 Dimensional drawing
Diagram 9: Equipment dimensions
9 Maintenance
SICK sensors require no maintenance. We recommend that you (at regular intervals):
! Clean the optical interfaces
! Check the screw and plug connections
Contact:
Australia
Phone +61 3 94 97 41 00
0 08 33 48 02 – toll free
Fax +61 3 94 97 11 87
Austria
Phone +43 2 23 66 22 88-0
Fax +43 2 23 66 22 88-5
Belgium/Luxembourg
Phone +32 24 66 55 66
Fax +32 24 63 35 07
Brazil
Phone +55 11 55 61 26 83
Fax +55 11 5 35 41 53
China/Hong Kong
Phone +8 52 27 63 69 66
Fax +8 52 27 63 63 11
Czech Republic
Phone +42 02 57 81 05 61
Fax +42 02 57 81 05 59
Denmark
Phone +45 45 82 64 00
Fax +45 45 82 64 01
Finland
Phone +3 58 9-7 28 85 00
Fax +3 58 9-72 88 50 55
France
Phone +33 1-64 62 35 00
Fax +33 1-64 62 35 77
Germany
Phone +49 76 81 2 02-0
Fax +49 76 81 2 02-36 09
Great Britain
Phone +44 17 27-83 11 21
Fax +44 17 27-85 67 67
Italy
Phone +39 02-92 14 20 62
Fax +39 02-92 14 20 67
Japan
Phone +813 33 58-13 41
Fax +813 33 58-05 86
Netherlands
Phone +31 3 02 29 25 44
Fax +31 3 02 29 39 94
Norway
Phone +47 67 56 75 00
Fax +47 67 56 66 10
Poland
Phone +48 2 26 44-83 45
Fax +48 2 26 44-83 42
Singapore
Phone +65 7 44 37 32
Fax +65 8 41 77 47
Spain
Phone +34 9 34 80 31 00
Fax +34 9 34 73 44 69
Sweden
Phone +46 8-6 80 64 50
Fax +46 8-7 10 18 75
Switzerland
Phone +41 4 16 19 29 39
Fax +41 4 16 19 29 21
Taiwan
Phone +88 62 23 65 62 92
Fax +88 62 23 68 73 97
USA
Phone +1 (952) 9 41-67 80
Fax +1 (952) 9 41-92 87
Representatives and agencies
in all major industrial nations.
SICK AG • Automatisierungstechnik • Sebastian-Kneipp-Straße 1 • D-79183 Waldkirch
Phone +49 76 81 2 02-0 • Fax +49 76 81 2 02-36 09 • www.sick.de
8 009 299/19-12-01• HJS/RF • Printed in Germany (01.01) • We reserve the right to make changes
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