Leuze lumiflex Scan Quick start guide

601520 -02/06 Subject to change without prior notice
SCAN
Measuring Light Curtain
Connecting and Operating Instructions

2SCAN
DEUTSCH ENGLISCH FRANZÖSISCH ITALIENISCH SPANISCH
Notes on using these connecting and operating instructions
These connecting and operating instructions contain information regarding the proper
and effective use of SCAN light curtains. It is included in the scope of delivery.
Safety notes and warnings are designated by the symbol .
Leuze lumiflex GmbH + Co. KG is not liable for damage resulting from improper
use of its equipment. Familiarity with these instructions constitutes part of the
knowledge required for proper use.
© Reprint and reproduction, in whole or in part, only with the explicit permission of
Leuze lumiflex GmbH + Co. KG
Liebigstraße 4
D-82256 Fürstenfeldbruck
Tel. [phone]
Fax [phone]
E-Mail: [e-mail]
http://www.leuze.de

SCAN 3
SPANISCH ITALIENISCH FRANZÖSISCH ENGLISCH DEUTSCH
Table of Contents
1 System Overview and Range of Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Range of Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Safety Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Configuration and Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Display Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.4 Switch Output Measurement Field Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.5 RS 485 Data Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.6 Driver Program for the PLC Control (e.g. Siemens S7-200) . . . . . . . . . . . . . . . . . . . . . . . 9
3.7 Contamination and Error Signal Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 Standard Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Mounting SCAN with the Protective Mounting Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5 Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1 Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2 Electrical Connections and Terminal Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6 Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8 Technical Data and Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
9 Selection and Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9.1 Device Designation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9.2 Order Numbers and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
10 Declaration of Confirmity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

4SCAN
DEUTSCH ENGLISCH FRANZÖSISCH ITALIENISCH SPANISCH
1 System Overview and Range of Applications
1.1 System Overview
SCAN light curtains consist of a transmitter and a receiver. Like a light barrier, they
work with modulated infrared light and stand out due to the following features:
• Measurement field up to 6 m wide, from 900 to 3000 mm high
• 30 mm resolution at every position of the measurement field
• Can be connected directly to an PLC control (such as the Siemens S7-200)
• PNP switch output for measurement field status free/occupied
• Simple connection due to M12 connector
• Contamination and error signal output to the PLC
• Extremely small design (cross-section 17 mm x 33 mm)

SCAN 5
SPANISCH ITALIENISCH FRANZÖSISCH ENGLISCH DEUTSCH
1.2 Range of Applications
The scope of SCAN applications ranges from simple detection or measuring tasks,
such as controlling projection or the presence of an object, to contour or shape
recognition.
Fig. 1: Examples of Applications Using the Measuring Light Curtain SCAN
S7-200
S7-200
S7-200
S7-200
S7-200
S7-200
Measuring of distance
Loop control
Shape evaluation
Hole detection
Measuring of widths
Measuring of heights
Overhang control
Customer
machine
control

6SCAN
DEUTSCH ENGLISCH FRANZÖSISCH ITALIENISCH SPANISCH
2 Safety Notes
SCAN light curtains are not active optoelectronic protective devices (AOPD) in
accordance with IEC 61496-1, -2 and are thus not suited for personnel protection.
3 Configuration and Function
3.1 System Configuration
SCAN light curtains consist of a transmitter equipped with a number of sequentially
controlled IR radiation elements aligned in a row, and a receiver equipped with a
number of sequentially controlled receiver elements, likewise aligned in a row. The
parallel light axes projected between the transmitter and receiver create a measure-
ment field with a resolution of 30 mm. In order to achieve linked measurement fields for
different geometric planes, SCAN master and slave units can be switched in succes-
sion by means of a plug-in connector cable. The receiver has a switch output for
performing simple detection tasks as well as a serial data interface for transmitting
measurement values to a control system for further processing. A driver program is
available that enables SCAN to be connected directly to the Siemens S7-200. Drivers
for controls from other manufacturers can be produced upon request.
Figure 3 shows the system configuration of SCAN in both its standard design and its
master/slave version.
a = SCAN transmitter
b = SCAN receiver
c = +24V DC
d=0V
e = +24V DC
f=0V
g = RS 485
h = SCAN transmitter master
i = SCAN transmitter slave
Fig. 2: SCAN Standard Configuration or Master/Slave Version
a b
i
h
f
e
g
d
c
e
f
g
d
c

SCAN 7
SPANISCH ITALIENISCH FRANZÖSISCH ENGLISCH DEUTSCH
3.2 Function
After the supply voltage is applied, the infrared light axes are controlled and evaluated
individually in quick succession. The measurement value of each light axis (“light path
unobstructed” or “light path interrupted”) is output either as an aggregate signal at the
switch output or as a single measurement value within a serial data stream via the RS
485 interface of the receiver.
3.3 Display Elements
3.4 Switch Output Measurement Field Status
The short-circuit-proof +24V DC pnp switch output on the receiver is able to switch
earthed loads of up to 0.1 A. Contactors or relays must be wired parallel to the coil with
suitable components for suppressing interference.
a = Object in the measurement field or device out of alignment
b = Measurement field unobstructed
c = Failure in the receiver
d = Supply voltage / Transmitter on
e = Failure in the transmitter
Fig. 3: Display Elements
transmitter
Vor Anschluss
Betriebsanleitung
beachten!
Pay attention to
manual prior to
installation!
power
failure
Vor Anschluß
Betriebsanleitung
beachten!
Pay attention to
manual prior to
installation!
d
e
a
b
c
SCAN
receiver
SCAN
failure

8SCAN
DEUTSCH ENGLISCH FRANZÖSISCH ITALIENISCH SPANISCH
3.5 RS 485 Data Interface
The signal statuses of the individual light axes (“light path unobstructed” or “light path
interrupted”) are transmitted as a serial data stream over the RS 485 interface. The
transmission takes place in half duplex mode at 19.200 baud in the Leuze lumiflex-
specific protocol described below.
The data packet cyclically transmitted by the receiver is configured as follows:
Description:
STK: start identifier constant 0BH
LDP: dependent on the beam number (min.9 , max.35)
LDP = 1 byte(STK) + 1 byte (LDP) + 1 byte (STA) + 1 byte (STZ)
+ x byte (NDT) + 1 byte (CRC)
where: x [NDT] = (STZ/8) rounded up to the next full byte.
Example:
STZ = 35:
--> x [NDT] = (35/8) = 4,375 --> x [NDT] = 5 --> LDP = 5 + 5 = 10
STZ = 162:
--> x [NDT] = (162/8) = 20,25 --> x [NDT] = 21 --> LDP = 5 + 21 = 26
STZ = 240:
--> x [NDT] = (240/8) = 30,0 --> x [NDT] = 30 --> LDP = 5 + 30 = 35
Start identifier (STK) 1 byte
Length of the entire packet (LDP) 1 byte
Status (STA) 1 byte
Beam number (STZ) 1 byte
Usable data (light path unobstructed) (NDT) 1..30 byte
CRC (8 Bit) (CRC) 1 byte
STA:Bit 0: 0 = no error , 1 = error/message (in normal operation Bit 0 = 0)
Bit 1: 0 = (internal information)
Bit 2: 1 = (internal information)
Bit 3: 0 = strong receiver signal, 1 = weak receiver signal
Bit 4..5: free
Bit 6: 0 = object in the measurement field,
1 = all light paths unobstructed
Bit 7: 0 = (internal Information)
In case of an error/message (Bit 0 = 1):
Bit 1..5: error number
Bit 6..7: free

SCAN 9
SPANISCH ITALIENISCH FRANZÖSISCH ENGLISCH DEUTSCH
Example:
STZ = 35: --> 5 bytes of beam data
NDT = xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx 00000xxx
Example of a complete send string:
64-beam unit,
beams 1..10 no reception,
eams 40..50 weak reception,
object in the measurement field,
no error:
0BH, 0DH, 0CH, 40H, 00H, FCH, FFH, FFH, FFH, FFH, FFH, FFH, 58H
3.6 Driver Program for the PLC Control (e.g. Siemens S7-200)
An PLC-specific software module is required in order for the control to be able to
accept the measurement data. The program configuration is clearly shown by the
following example of the driver for the Siemens S7-200 control. Based on the
transmission protocol described above, drivers for other controls can be easily created
by any programmer familiar with that particular control. Leuze lumiflex would be happy
to lend support in this regard and is endeavoring to gradually offer drivers for other
well-known controls.
The following example illustrates the program structure of the software module. The
corresponding program listing in STEP7/Micro is available upon request.
The driver program, which functions as an interrupt module, takes over the SCAN
measurement data as a serial data stream at Port 0 and deposits them in a data buffer.
The individual light axis are made available to the user bit-by-bit beginning at memory
position VB20 (1 = light, 0 = no light), continuing from the first light axis (at the SCAN
connection) to the last light axis (at SCAN´s free end).
When a data packet has been successfully received, the driver program sets the
marker „M_Userbuffer_ready“. Since this marker can be deleted by the user program
after the measurement values have been read in, it can be used to control the data
receiption.
In case of an error/message, the error number determines the contents of the usable
data:
Error numbers 0..30: Usable data (NDT) 1 byte with an indication of the error
location (LOC)
Error numbers 31: Usable data (NDT) max. 250 bytebyte with copyright message
STZ:Beam number 1..240
NDT:(error/message bit = 0):
only beam data
beam 1: LSBit byte1 ... beam 240: MSBit byte30 in block
x: 0 = beam interrupted , 1 = beam unobstructed
CRC:8 Bit CRC with generator polynomial 19B hex.
The CRC sum is arrived at by means of STK, LDP, STA, STZ, NDT.

10 SCAN
DEUTSCH ENGLISCH FRANZÖSISCH ITALIENISCH SPANISCH
The entire memory area of the PLC is availabe to the user program, with the exception
of the variable memory VB0 ... VB50 and the marker bit M0.0.
3.7 Contamination and Error Signal Output
This pnp output normally carries +24V DC. In case of a weak receiver signal caused by
contamination or misalignment, or in case of a fault, this output is switched to high
resistance. The output is short-circuit-proof and can carry up to 70 mA.
Fig. 4: Software module for data acceptance by the Siemens Simatic S7/200
port 0
interrupt-
routine 0
determine length
of data packet
interrupt-
routine 1
user
program
subprogram
0
initialization
data buffer
header
usable
data
CRC
VB16
VB20
read access write access

SCAN 11
SPANISCH ITALIENISCH FRANZÖSISCH ENGLISCH DEUTSCH
4 Mounting
4.1 Standard Mounting
SCAN units are mounted by means of through holes in the profile end pieces. (For the
distance between holes, see the dimensional table on page 17 and the dimensional
drawing on page 18.) The holes have a diameter of 5.3 mm.
This fixed mounting method is appropriate only when no adjustment is required (i.e. the
mounting surfaces are located in one plane and the mounting positions are at the same
height).
a=Mounting surface
b=Screw M5
c=Washer
d=Nut M5
Fig. 5: SCAN Standard Mounting
using Through Holes in
the End Pieces
SCAN

12 SCAN
DEUTSCH ENGLISCH FRANZÖSISCH ITALIENISCH SPANISCH
4.2 Mounting SCAN with the Protective Mounting Profile
To provide additional mechanical protection, the SCAN can be snapped into a
protective mounting profile. This is recommended for larger measurement heights and
when the units need to be adjustable. The protective mounting profile can be used with
either a standard mounting bracket or a swivelling mounting support with vibration
damping..
Standard Mounting Bracket
Swivelling Mounting Support
with Vibration Damping
(Swivelling range ±8 °)
SCAN with Protective Mounting Profile
a = SCAN protective mounting
profile
b = Lengthwise groove for freely
positionable M6 sliding brackets
c = Slot 13 x 6
d = swivelling angle
Fig. 6: Mounting using the SCAN Protective Mounting Profile
SCAN
a
b

SCAN 13
SPANISCH ITALIENISCH FRANZÖSISCH ENGLISCH DEUTSCH
5 Electrical Installation
5.1 Supply Voltage
The transmitter and receiver must be supplied with +24V DC +/- 20 %. The maximum
power consumption is 150 mA (without load). The power supply must exhibit a safe
mains separation in accordance with IEC 60742 and be able to bridge short-term
mains failures of up to 20 ms.
5.2 Electrical Connections and Terminal Assignment
The connections are made using shielded connecting cables with M12 connectors
(available as accessories). There are two possible types of connection. Either the
transmitter and receiver can be connected to the control cabinet via separate cables
(M12 plug at one end), or they can be joined via an M12 Y-distributor and then
connected to the control cabinet by means of a joint connecting cable (see Accesso-
ries).
The shield must be connected to PE. The cables must be laid separately from mains
power cables. The following tables show the terminal assignments of the transmitter
and receiver.
SCAN Transmitter SCAN Receiver
M12
Con-
nector
Wire color Meaning M12
Con-
nector
Wire color Meaning
1white +24V DC 1white +24V DC
2brown PE 2brown PE
3green 0 V 3green 0 V
4yellow free 4yellow Switch
output
5grey free 5grey “Weak signal”,
“Failure”
6pink free 6pink RS 485+
7blue free 7blue RS 485-
8Protective shield/PE 8Protective shield/PE

14 SCAN
DEUTSCH ENGLISCH FRANZÖSISCH ITALIENISCH SPANISCH
5.2.1 SCAN as a Switching Light Curtain in Stand-alone Operation
5.2.2 SCAN as a Measuring Light Curtain with the Siemens S7-200
a = SCAN transmitter
b=SCANreceiver
c = white at +24V DC
d = green at 0V
e = shield/PE at control cabinet ground
f = pnp switch output
g = PLC input
Fig. 7: SCAN as a Switching Light Curtain in Stand-alone Operation
a = SCAN transmitter
b=SCANreceiver
c = M12-Y-distributor
d = white at +24V DC
e = green at 0 V
f = grey (weak signal/error) at PLC
input
g = pink (RS 485 +) at PLC-RS 485,
Pin 3
h = blue (RS 485 -) at PLC-RS 485,
Pin 8
i = shield/PE at PLC-RS 485, Pin 1
k=PLC
Fig. 8: SCAN as a Measuring Light Curtain in Combination with the Siemens
S7-200
g
f
pnp, 100mA max.
e
d
c
e
d
c
a b
c
a b
k
RS485
3
8
1
i
h
g
f
e
d

SCAN 15
SPANISCH ITALIENISCH FRANZÖSISCH ENGLISCH DEUTSCH
6 Start-up
• Before switching on the unit for the first time, check the supply voltage
(+24V DC +/- 20 %).
• Turn on the supply voltage (transmitter LED “power“ lights up).
• A self-test lasting approx. 2 sec. will be performed in the transmitter and receiver.
• In case of optimal alignment, only the green LED in the receiver will still be lit up.
If the green LED does not light up after 2 seconds, please check the following points:
• Make sure that there is no object in the sensing zone.
• If so, remove the object.
• Check the orientation of the units to each other. (Transmitter and receiver must be
mounted at the same height, and the front screens must be exactly parallel to each
other.)
• If the “failure” LED lights up in the transmitter or receiver, the corresponding
component has an internal defect and must be replaced.
• For operation with Simatic S7-200:
To activate the freely programmable communication over Port 0, the operating
mode switch must be set at “RUN”. In the “TERM” position, the PPI protocol for
communicating with the programming device is enabled. The entire memory area
of the PLC, except for the variable memory VB0 ... VB50 and the marker byte
M0.0, is available to the user program.
7 Cleaning
The front screens must be cleaned regularly, depending on the amount of dirt that has
accumulated. The message output of the receiver indicates, at the latest, when
cleaning is necessary. We recommend using a mild cleaning agent for cleaning the
Plexiglas front screens. The Plexiglas front screens are highly resistant to diluted
acids and alkalies, and are resistant to organic solvents to a limited extent.
8 Technical Data and Dimensional Drawings
Measurement field height 900, 1050, 1200, 1350, 1500, 1800 mm *)
Measurement field width (range) 0.3 ... 6 m
Resolution 30 mm
Number of light axes 33 - 250 (6 light axes per 150 mm measurement height)
Time required per light axis 200 µs
Transmitter
Class
Wave length
Pulse duration
Pulse pause
Output
Light-emitting diodes as defined by
EN 60825-1: 1994 + A1:2002 + A2:2001
1
880 nm
7 ms
3,12 ms
8,73 µW

16 SCAN
DEUTSCH ENGLISCH FRANZÖSISCH ITALIENISCH SPANISCH
*) other measurement heights up to 3000 mm upon request
Dimensions, Weights and Scanning Times of the SCAN light curtains
Ambient operating temperature 0 ... 55 °C
Protection class I
Supply voltage +24V DC +/- 20 %
Current consumption Transmitter: 75 mA, receiver: 75 mA
Switch output pnp output, short-circuit-proof, 100 mA max
Contamination/error signal output pnp output, short-circuit-proof, 70 mA max
Data interface/Receiver RS-485, 19 200 baud, half duplex mode
Electrical connection 8-pin round M12 plug-in connector
Connecting cable 7-pin, 0.25 mm2, shielded, with injection molded connector,
length 5 m or 15 m (see Accessories)
Dimensions Cross-section 17 mm x 33 mm, Length (with connector and
connecting area) = measurement height + 96 mm
Humidity 15 ... 95 % (non-condensing)
Storage temperature -25 ... +75 °C
Device Type Protecting
height = Dim.A
[mm] *)
Dim. B
[mm]
Mounting Dim.
a [mm]
Weight
[kg]
Time/Scan
[ms]
S30-150 170.5 248.5 238.5 0.156 7.2
S30-225 245.5 323.5 313.5 0.198 10.8
S30-300 320.5 398.5 388.5 0.24 14.6
S30-450 470.5 548.5 538.5 0.324 10.8
S30-600 620.5 698.5 688.5 0.408 14.4
S30-750 770.5 848.5 838.5 0.492 18
S30-900 920.5 998.5 988.5 0.576 14.4
S30-1050 1070.5 1148.5 1138.5 0.66 16.8
S30-1200 1220.5 1298.5 1288.5 0.745 19.2
S30-1350 1370.5 1448.5 1438.5 0.83 21.6
S30-1500 1520.5 1598.5 1588.5 0.913 24
S30-1650 1670.5 1748.5 1738.5 0.997 26.4
S30-1800 1820.5 1898.5 1888.5 1.08 28.8
S30-2100 2120.5 2198.5 2188.5 1.2 32.4
S30-2400 2420.5 2498.5 2488.5 1.36 38.4
S30-2700 2720.5 2798.5 2788.5 1.52 43.2
S30-3000 3020.5 3098.5 3088.5 1.68 48

SCAN 17
SPANISCH ITALIENISCH FRANZÖSISCH ENGLISCH DEUTSCH
a = Mounting dimension
b = Clearance for
removing the plug
c=Screw M5 or M5
d = End of sensing zone
Fig. 9: Dimensional Drawing of SCAN Series S30
SCAN
17
A
33
13
23 c
B
a
d
30
d
66.5
b=10

18 SCAN
DEUTSCH ENGLISCH FRANZÖSISCH ITALIENISCH SPANISCH
Fig. 10: Dimensional Drawing of SCAN “Cascaded Design“
a = Mounting dimension
b = End of sensing zone
c= Coupling
d = Total length including coupling,
max. 250 mm

SCAN 19
SPANISCH ITALIENISCH FRANZÖSISCH ENGLISCH DEUTSCH
Dimensional Table
The total measurement times for master and slave units are made up of the sum of the
partial scan times.
9 Selection and Ordering Information
9.1 Device Designation
Example SR30-900 M
Ea bb-dddd e
SSCAN
a T = transmitter
R = receiver
bb Resolution [mm]
dddd Measurement height [mm]
eOnly for cascadable units
M = master unit
S = slave unit
9.2 Order Numbers and Accessories
The scope of supply of a SCAN consists of:
• 1 SCAN transmitter ST...
Device Type Slave Maß A Slave Maß B
S30-150 180 248.5
S30-225 225 323.5
S30-300 330 398.5
S30-450 480 548.5
S30-600 630 698.5
S30-750 780 848.5
S30-900 930 998.5
S30-1050 1080 1148.5
S30-1200 1230 1298.5
S30-1350 1380 1448.5
S30-1500 1530 1598.5
S30-1650 1680 1748.5
S30-1800 1830 1898.5

20 SCAN
DEUTSCH ENGLISCH FRANZÖSISCH ITALIENISCH SPANISCH
• 1 SCAN receiver SR ...
• 1 set of Connecting and Operating Instructions
Order numbers
*) other measurement heights up to 3000 mm upon request
Accessories:
SCAN Protective Mounting Profile
The snap-open profile offers additional protection and variable possibilities for moun-
ting using either a standard mounting bracket or a swivelling mounting support.
For the dimensions of B, see dimensional table on page 17/18.
Type *) Standard Master Slave
ST30-900
SR30-900
641309
644309
642309
645309
643309
646309
ST30-1050
SR30-1050
641310
644310
642310
645310
643310
646310
ST30-1200
SR30-1200
641312
644312
642312
645312
643312
646312
ST30-1350
SR30-1350
641313
644313
642313
645313
643313
646313
ST30-1500
SR30-1500
641315
644315
642315
645315
643315
646315
ST30-1650
SR30-1650
641316
644316
642316
645316
643316
646316
ST30-1800
SR30-1800
641318
644318
642318
645318
643318
646318
a=SCANprotective mounting profile
b=SCAN
Fig. 11: Dimensional Drawing of “SCAN Protective Mounting Profile“
B
a
b
30,65
19
30