BackLog Scanners

Type MD Light-curtain- and -

Type PROX with Remote I/O Block

Type MD Light-curtain

The Type MD Light-curtain scanner was originally designed as a simple light curtain to provide a rough diameter measurement of logs. Since its inception it has morphed into a number of useful devices.

West Fraser (Pacific Inland Resources) used a number of the MD sensors as a backlog scanner to control the flow of lumber from the unscrambler through to the lug loader. This was always a problem area both for production and safety of the workers.

The new scanner has improved both situations. Now, with a controlled flow, they are achieving a higher lug fill while eliminating a lot of the pinch and back injuries from moving large, heavy boards on the transfer conveyor.

Specifications

• Type MD Scanner has LEDs spaced at one-inch (25mm) along its length.

• With its 19-foot (6m) field of view the receiver can be place high, out of the way of operations.

• The emitter can be placed under the transfer chain, angled toward the back clear lumber line.

• Available in lengths of 8-inches (200mm) to 120- inches (3030mm) in 8-inch increments.

Receivers in ceiling

Significant increase in lug fill %

Type MD emitter under transfer chain

Scanner protected by angled plexi-glass

Emitter below chain and receiver above at an angle at lug loader

Emitter at angle with plexi-glass debris cover

Type PROX

The new Type PROX is an outcome of the success of the MD scanner. It has the emitter LED and the receiver phototransistor on the same board.

The scanner is mounted over or under the transfer deck between 4-inches (100mm) and 18-inches (460mm) from the board.

Each cell outputs its data to a remote I/O block through an RS422 serial link. The I/O block can be located up to 1,000 feet away in the PLC.

I/O outputs may be combined to reduce I/O inputs into the PLC

Specifications

• Available in lengths of 8-inches (200mm) to 64- inches (1625mm) in 8-inch increments.

• 12 to 24volt power requirement• Detects up to 18-inch (467mm)

field of view. (adjustable)• Single RS422 cable connects to

remote I/O block (REM-I/O)

PROX Mounted Beneath Chain

• With frequency drives on each deck, the lumber speeds up to fill any gap in the flow.

• Double-ups almost eliminated - increasing safety for the workers.

• Higher lug fill with metering feed.

Remote I/O Block (REM-IO)

• I/O from each cell on scanner is transmitted via RS422 serial link to the remote I/O block.

• I/O can be grouped using a true table to reduce I/O in the PLC

• Removable Quick terminals • RS232 interface for ease in

programming with PC.• Adjustable emitter intensity

5 Volts LED

Supply Terminal Windows

Interface serial link

NPN Input

terminals

Interface cable

Emitter Intensity

Scanner Head Terminal

NPNLED status

Cell LED display

Area PROX Module

• Scanner installed over or under lumber transfer deck• Tracking LEDs on side for ease in troubleshooting• Extruded aluminium, waterproof enclosure• 12 – 24 volt

Interface to PC

RS232 interface to PC and Windows based programming

Rail Mounted in PLC cabinet

RS422 input from scanner

Interconnection wiring

Vcc0 Vdc

To Rx+ (Out)To RX- (Out)From Tx+ (In)From Tx- (in)

RedGrayWhiteYellowGreenBrown

Wire Description & Color

851432

Turks Pin Connector

Blue and Pink N.C.

Language selection

PNP configuration window

Program Quit button

Interface Software Version

Global display Cells configuration

(viewing only)

Save Configuration

to file

ActiveConfiguration

window

Configuration windowPosition

Exit Program

Minimize window

Default Configuration

Open Configuration

from file

Software Interface to Configure Scanner

X-axis are outputs from REM-IO module

Y-axis show cells from PROX

Available Configurations in Matrix

• Cell activates the corresponding Output • Cell does not activate the corresponding Output • Shadow Cancel cell • Shadow Cancel cell • Cancel Cell at the corresponding row (can be configured

with last column)• Active Cell (can be configured with last column)

Prox above transfer

• Area Prox shown above the transfer deck.

• Note tracking LEDs on the side that shows each activated LED as well as power and communications link LEDs.

• Up to 3,500 scans/sec.

Automatic Planer Infeed

• PLC logic provides “just in time” solution to arrive at the pinch rolls at the proper time

• Eliminates the friction from too much pressure from the boards on the deck feeding the bridge

• Entire line controlled by tilt-hoist operator

For additional information and specifications on our entire program please visit our website.

For questions about applications we will be pleased to discuss them with you….

ScanMeg Inc.3517 boul. Grande Allée,Boisbriand, QC J7H 1H5CanadaPh: 450.419.4555Fx: 450.419.4542Gilles Pilon or Denis Garneau

info@scanmeg.com

www.scanmeg.com

ScanMeg West10972 Swan Crescent,Surrey BC V3R 5B6CanadaPh: 604.582.2157Fx: 604.582.2105John Wilby

jwilby@scanmeg.com

www.scanmegwest.com