Gravotech XCOM Operating instructions

M_XCOM_EN_B - Last updated: 11/2020 - Translation of the French original document
OPERATING AND MAINTENANCE MANUAL
XCOM
CONTROL UNIT FOR MARKING MACHINES

Table of contents
M_XCOM_EN_B 2
A. Foreword ..................................................................................................................................................4
1. Appreciation ..........................................................................................................................................4
2. Information ............................................................................................................................................4
B. Legal notices ...........................................................................................................................................5
C. Regulation observance ...........................................................................................................................6
D. Description of symbols used .................................................................................................................7
1. Shared labels ........................................................................................................................................7
2. Required safety labels ...........................................................................................................................7
E. Introduction .............................................................................................................................................8
1. Presentation ..........................................................................................................................................8
2. Identi󰘰cationofthemarkingequipment.................................................................................................8
F. Unpacking ................................................................................................................................................9
1. Unpacking-Packagecontents..............................................................................................................9
G. Safety ......................................................................................................................................................10
1. Workstationsafety..............................................................................................................................10
Personnel safety ................................................................................................................................10
Handling the machine ........................................................................................................................10
H. Description of the Control Unit ............................................................................................................11
1. Front view of the machine ...................................................................................................................11
2. Rear view of the machine ....................................................................................................................11
I. Installation .............................................................................................................................................12
1. Physical installation .............................................................................................................................12
2. Electrical installation ............................................................................................................................13
J. Connections - Installation ....................................................................................................................14
1. View of connectors ..............................................................................................................................14
2. Connections ........................................................................................................................................15
Wiringofthe"Stopmarking"contact .................................................................................................15
ConnectionofthemarkingheadtotheCCU.....................................................................................15
Power supply connection ...................................................................................................................15
3. Hook(s)(DIN):Installationlocation(s) .................................................................................................16

M_XCOM_EN_B 3
4. Installation ...........................................................................................................................................16
Switching on the machine ..................................................................................................................16
Power down .......................................................................................................................................17
Restarting ..........................................................................................................................................17
K. Using the machine ................................................................................................................................18
1. Using the T08 program ........................................................................................................................18
L. Communication .....................................................................................................................................19
1. RS232 cable ........................................................................................................................................19
2. Dedicated Inputs/Outputs ....................................................................................................................20
Description of the communication signals .........................................................................................22
Timing diagrams of the communication signals .................................................................................23
3. Generic Inputs/Outputs .......................................................................................................................27
Wiring of the female 25 SubD connector ...........................................................................................27
Characteristics of the Inputs ..............................................................................................................28
Characteristics of the Outputs ...........................................................................................................30
4. USB Host connector ............................................................................................................................31
5. RJ45 - Ethernet connector ..................................................................................................................31
6. FIELDBUSconnector(optional)..........................................................................................................32
7. SAFETYconnector(optional)..............................................................................................................32
Connector .........................................................................................................................................32
M. Accessories available upon request ...................................................................................................34
N. Preventive maintenance .......................................................................................................................36
1. Changingthefuse(fusecarrier)...........................................................................................................36
O. Incidents and resolution of the problems ...........................................................................................37
P. Dimensional drawings ..........................................................................................................................38
1. DimensionaldrawingoftheControlUnitinboxcon󰘰guration.............................................................38
2. DimensionaldrawingoftheControlUnitinrackcon󰘰guration............................................................39
CCUassemblyinrackcon󰘰guration..................................................................................................40
Q. Technicalspeci󰄈cations.......................................................................................................................43
1. Physical characteristics .......................................................................................................................43
2. Environment ........................................................................................................................................43
3. Electrical characteristics ......................................................................................................................43

M_XCOM_EN_B 4
A. Foreword
1. Appreciation
ThankyouforchoosingXCOM-Gravotech.
Gravotech is pleased to count you among the users of its engraving and traceability solutions.
For help, contact Gravotech.
For more information on products, visit www.gravotech.com website.
2. Information
To ensure security and productivity, read this manual before starting-up the
equipment.
It provides details about the installation and use of the equipment.
Keep this manual in case you need to refer to it.
Fortheattentionofusershavinganindividualcardiacassistdevice󰄈tted:
Our equipment is designed and manufactured with the greatest care in order to
guarantee their compliance with the EMC Directive currently in force. This means
that the levels of electromagnetic emissions produced by this equipment when in
operationarelimitedanddonotexceedthethresholdsde󰄈nedbytheDirective.
However, multiple factors make it impossible to guarantee the total absence of risk
forusershavingacardiacassistdevice󰄈tted.Consequently,itisrecommendedthat
standing for a prolonged period within less than 1 m (3.281 ft) of an operating machine
should be avoided.

B. Legal notices
Last updated: 09/2020
Thepurposeofthisdocumentistoprovideusers(hereinaftertheUser(s))withinformationandtoensuretheirsafety.Ithasnocontractual
value and Gravotech group (hereinafter Gravotech) reserves the right, at any time and without notice, to make such changes or
improvementsasitdeems󰘰ts,ortosubstituteanynewequipmentand/ormaterialand/orpartand/orimagetoitsequipment,software
and/orassociatedmanualsordocumentation(hereinaftertheProduct(s)).
This manual, including texts, images, photos, graphics, design, or any compilation, digital conversion or data contained in it, is subject to
copyright. This manual shall not be reproduced, disseminated, transmitted, transcribed, translated or stored electronically, on any medium
whatsoeverregardlessofitsformatwithouttheexpressandwrittenpermissionofGravotech,totheexceptionofsoftwarebackupcopies
as provided by law.
TheintellectualpropertyrightsrelatingtotheProductsandtothismanual,including-butnotlimitedto-patents,trademarks,models,
copyright, domain names and also the know-how, trading name or company name, are owned by Gravotech Marking S.A.S or any
company of the Gravotech group. Under no circumstances does the transmission of this manual or the supply of Products or services
constitute an assignment of or any express or tacit license for any intellectual property right owned by Gravotech.
Totheextentpermittedbylaw,Gravotechprovidesherebynowarranty(inparticularnowarrantiesofperformance,non-infringement,
merchantabilityor 󰘰tnessforaparticularpurpose)relatingtothesupply ofitsProducts,otherthanthoseconferreduponthe Userby
Gravotech's general terms and conditions of sale or any contractual document agreed between Gravotech and the User. Nor does
Gravotechguaranteethecompatibilityofitssoftwarewithanysoftwarepackagenotsuppliedbyit,oranydefectinassembly,adaptation,
design, compatibility and operation with any or part of a combination created by the User.
Gravotech shall not be liable for any damages, that the User or its property, a third party or the Product itself may su󰘯er, caused
by the Product and arising from any inappropriate use or misuse of the Product, negligence, carelessness, inadequate supervision or
maintenance, failure to observe the safety or usage instructions described herein or otherwise communicated to the User, the use of poor-
qualityornon-recommendedlubricants,󰘱uidsandadditivesorwherethereisfaultonthepartoftheUserorathirdparty.Asprovidedin
thismanual,theUsershallfurthermore(i)observethenormalconditionsofuse,(ii)notexceedtherecommendedmaximumnumberof
hoursduringwhichtheequipmentmaybeoperatedonand(iii)refrainfromproceedingtoanyProduct'srepairormakeitproceedbyany
unquali󰘰edthirdparty,orwithouttheappropriatepersonalprotectiveequipment.
TheProduct'sspeci󰘰cationsarealteredby(i)anyProduct'smodi󰘰cationoralteration,(ii)anyadaptationandinstallationofaccessories
thatarenotrecommendedbyGravotech,(iii) the integration of a control system and (iv)theconnectiontoanexternaldevice.Such
speci󰘰cations' alterations may lead to the non-compliance of the Product with applicable rules and standards. Shall the Product be
non-compliant,thepersoninchargeoftheProduct'sinstallationshallberesponsibleofthe󰘰nalworkstation'scompliance.Innoevent,
Gravotech shall be liable for any damages arising from such non-recommended or unauthorized Product's alterations. It is precised that
the warranty shall not apply in such case.
UndernocircumstancesshallGravotechbeheldliableforanyindirect,incidental,special,consequentialpunitiveorothersimilardamages,
includinganyeconomicloss,lossofpro󰘰t,lossofdataoropportunity,whetherornotforeseeablebyorcommunicatedtoGravotech,
caused by this manual or the supply of Products or services concerned by the said manual.
To the widest extent permitted by law, Gravotech shall only be held liable for direct damage arising from personal injury caused by a fault
proveninitsProduct(includingthismanual).
Gravotech®andthe trademarks ofproductsmarketedby Gravotech groupareused,pending orregisteredtrademarksofGravotech
MarkingoroneofGravotechgroupsubsidiaries.
The products and names of third party companies which appear in this manual are used solely for the necessary purposes of reference,
andinparticularforissuesofcompatibility.Allthetrademarksmentionedinthismanualremainthepropertyoftheirrespectiveowners.
Windows®is(are)aused,pendingorregisteredtrademark(s)ofMicrosoftCorporation.Postscript®is(are)aused,pendingorregistered
trademark(s)ofAdobeSystemsIncorporated.
5M_XCOM_EN_B

C.Regulation observance
Last updated: 07/2020
EC declaration of conformity or declaration of incorporation supplied with the machinery
Type of machine Directives - Standards
Dotpeenmarking:Machine
Impact p, Impact eZ p, Impact m, Impact eZ m
Scribingmarking:Machine
M10, M10 Jewel, M20 Pix, M20 Energy
Sharpening by grinding: Machine
CG30
Bevelling: Machine
B6
Engraving by milling: Machine
IM3
M20, M20 Jewel, M20 ABC, M20 Pen, M20 Beauty Cube, M20 V3
M40, M40G, M40 ABC
IS200, IS400, IS400 Volume
IS6000, IS7000, IS8000 - XP - XP Milling
Hot foil stamping: Machine
M20 Artfoil
Dotpeenmarking:Transportablemachinery-Partlycompletedmachinery
XF530p, XF530m, XM500
Dotpeenmarking:Partlycompletedmachinery
XF510Cp-Sp-Dp, XF510Cm-Sm-Dm, XE310Cp-Sp
Scribingmarking:Partlycompletedmachinery
XF510Cr-Sr-Dr, SV510
CCU,Rack,TouchPad
UC500, UC500 SV, UC Laser, XCOM
RacksIS
Laser fume extractor:
ES10, ES30, ES50, ES Mini
LE120HP, LE140HP, LE150HP, LE190HP, LNI900
Accessory: Partly completed machinery
Rotary APF, Laser APF, Dotpeen APF
eZ300
Mini-Inline
Cylinder attachment:
DMC15, DMC25, DMC25PN
RD1, RD2, RDM, RD Jewel
Rotary Device for LS100, Rotary Device for LS100Ex, Rotary Device for
LS900/LS1000XP
- Low voltage: 2014/35/EU
- EMC: 2014/30/EU
- RoHS 2: 2011/65/EU
Dotpeenmarking:Portablemachine
XM700 - Low voltage: 2014/35/EU - EMC: 2014/30/EU
- RoHS 2: 2011/65/EU
- Cells and batteries: 2006/66/EC
CO2and󰘰berlasermarking:Machine(gantry)
LS100 Energy, LS100 Ex Energy, LS900 Energy
LS100, LS100 Ex, LS900, LS900 XP, LS1000XP
LS100 Ex Fibre, LS900 Fibre
LS900 Edge
CO2,DPSSand󰘰berlasermarking:Machine(galvo)
LW1,LW2,LW2Touch,LW3,WeLase(Cxx,Fxx,Gxx,Hxx),
WeLase 360 (Cxx,Fxx,Gxx,Hxx)
LaserSolutionHybrid-Series(standardversion,versionEnergy),Laser
SolutionGreen-Series(standardversion,versionEnergy),LaserSolution
CO2-Series(standardversion,versionEnergy),FiberEnergy
CO2,DPSSand󰘰berlasermarking:Partlycompletedmachinery(galvo)
– Class 4
LaserSolutionFiber-Series(standardversion,versionEnergy)
- Low voltage: 2014/35/EU
- EMC: 2014/30/EU
- RoHS 2: 2011/65/EU
-Safetyoflaserproducts-Part1:Equipmentclassi󰘰cationand
requirements: EN 60825-1:2008
- Safety of laser products - Part 4: Laser guards: EN 60825-4+A1+A2:2006
6M_XCOM_EN_B

D.Description of symbols used
Last updated: 06/2020
1. Shared labels
Refertoinstructionsmanual/booklet. Fuse
Alternating current Direct current
The equipment must be disposed of
at an appropriate collection point for
processing, sorting, and recycling
of Waste Electronic and Electrical
Equipment(WEEE).
By following these instructions, you are
helping the environment, contributing
to the preservation of our natural
resources, and protecting human
health.
European conformity
2. Required safety labels
General warning Warning: Electricity
Warning: Crushing of hands Warning: Hot surface
Warning: Flammable materials Warning:Laserbeam(onlyformachines equippedwithamarkinglaseroralaser
pointer)
Warning:Rotationofthespindle(only
formachinesequippedwithaspindle)
7
M_XCOM_EN_B

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M_XCOM_EN_B
E. Introduction
1. Presentation
The Control Unit is designed to manage the markings performed by the numerically controlled Heads
manufactured by Gravotech. It contains the control and power electronics, as well as a screen. The Control
Unit is the centre of the traceability system.
The Control Unit is supplied with:
• SubD9connectorwithbridging(male):Wiringofthe"Stopmarking"contact
2. Identi󰘰cationofthemarkingequipment
Themarkingequipmentisidenti󰘰edby:
• 1identi󰘰cationplateontheControlUnit
Have the model and serial number of the equipment available when contacting Gravotech.

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M_XCOM_EN_B
F. Unpacking
Dependingontheorder,theControlUnitispackedonitsownorwithamachine.
In order to protect the machine from humidity and dust, keep the machine in its original packaging in
case of prolonged storage.
1. Unpacking-Packagecontents
Thepackaginganditscontentsmayvaryaccordingtothemarkinghead.
See the user manual of the machine.

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M_XCOM_EN_B
G.Safety
1. Workstationsafety
Personnel safety
Turno󰓐themachinebeforebeginninganycleaning,maintenanceorrepair
procedure.
• TheXCOMmachineisdesignedformarkingapplications.Ifusedforotherpurposes,Gravotechcannot
guarantee the quality of the result. Gravotech is not responsible for damage caused by inappropriate use
of the machine.
• Donotusethismarkingequipmentinanexplosiveenvironment.
• Use the appropriate protection when equipment is used in a polluted environment. Use of these protections
are the user's or the integrator's responsibility.
• Dependingontheapplication(toolingorheavyparts),itisrecommendedtowearsafetyshoesandwork
gloves.
• Atthetimeofdisposal,wearingpersonalprotectiveequipment(PPE)isrecommendedtodismantlethe
mechanical elements of the machine.
• This equipment is not designed for outdoor operation.
• In the event of an emergency, to bring all moving parts to a stop:
-PuttheOn/O󰘯switchinthe"O"(O󰘯)position
or
- Disconnect the power cable.
Handling the machine
• Thismarkingequipmentisdesigned tofunctionata roomtemperaturebetween5 °C(41°F)to45 °C
(113°F).
• Thismarkingequipmentisnotdesignedtooperateindamppremises.
• The machine must be handled with extreme caution.
• The machine must be clean and protected from dust. In the event of an extended period of non-use,
unplug the power cable and protect the machine.
• Neverpourorspillliquidonthemachine(drinks,cleaningproducts,etc.)exceptwhererecommendedby
Gravotech.

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M_XCOM_EN_B
H.Description of the Control Unit
1. Front view of the machine
1
2
1. Color touch screen
2. Connectors(See:View of connectors)
2. Rear view of the machine
1
1. Hook(s)(DIN)

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M_XCOM_EN_B
I. Installation
1. Physical installation
PositiontheControlUnithorizontally,inadry,ventilatedarea,atleast20cm(7.874in)fromthe󰘱oor.Allow
clearance(connectionsandcables):rightsideofthemachine
MountinghooksforDINrailarelocatedattheback.
Do not obstruct air circulation under the machine. Respect the clearance areas indicated on the drawing.
Clearance dimension
Front panel: 19" 5U
Clearance dimension

Installation
13
M_XCOM_EN_B
2. Electrical installation
Turno󰓐themachinebeforebeginninganycleaning,maintenanceorrepair
procedure.Alwaysswitchthemachineo󰓐beforeconnectingordisconnectinga
cable or optional accessory.
Never unplug a cable while the machine is turned on (except for the mains lead in the
event of an emergency). The power outlet must be located alongside the equipment
and must be easily accessible.
Do not remove the power supply cover: risk of electric shock. The connection to
the single phase power supply is made with a standard, 3 pin plug with grounding.
Groundingmustbedoneaccordingtotheregulationsine󰓐ecttoensurethesafetyof
the personnel.
To avoid interference problems due to the external environment, observe the following:
• Usethelinkcablessupplied.TheycomplywithEMCradio-frequencyinterferenceemissionstandardsand
provideprotectionfromexternalelectricalinterference(compliantwithEMCimmunityandsusceptibility
standards).
• Bringtheitemsofequipmenttobelinkedasclosetogetheraspossibletoreducethelengthofcabletobe
used.
• Separatethepowercablefromthelinkcableandmakesurethepowerandlinkcablesdonotrunthrough
the same cable tray.
• Connect the machine direct to a mains power line and avoid connecting more than one device to that line
(bypluggingseveraldevicesintothesamemainssocketorintoamulti-wayadapter).
• Do not allow inductive or capacitive devices to be connected to the same mains power line as the machine
(motors,solenoidvalves,chargers,etc.).
• Avoid the installation of manual or automatic switching systems on the same mains power line as the
machine(relays,timers,programmers,automaticcircuit-breakers,automaticswitches,etc.).
• Checkthat devices in the vicinity of the machine meet the standards for electromagnetic interference.
Read the technical data sheet for each device. If they are non-compliant, move them as far away from the
machine as possible.
• Connections and cabling: separate the power supply cables from the control cables in cable ducts and in
thecabinet(forcontrolcables,asectionof0.34mm²isrecommended).
• Equipment󰘰ltering:therelaysconnectedtothemarkingmachineshouldincludeadeviceforsuppressing
interferenceontheoperatingcoil(freewheelingdiodeforDCrelaysorRCcircuitforACrelays).
• Connection of shielding: the communication cables (All Or Nothing I/O or Ethernet - RS232 computer
cables) must be shielded with both ends of the shielding connected to the equipment ground via the
shortestpossiblelink.
• Grounding:connecttogetheralltheconductivemetalgrounds(nopaintortreatmentsuchasanodization)
oftheequipment(frame,cabinet,markingmachine)toensuree󰘯ectiveconnection.Wherepossible,there
should be multiple connection points to improve the connection quality.
• Use the Gravotech accessories.

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M_XCOM_EN_B
J. Connections - Installation
1. View of connectors
1
2
3
4
5
678
14
13
10
15
16
11
12
9
1. :Ethernetconnection(RJ45)
2. :USBHostconnector(x2)
3. :USBDeviceconnector:Machine/PCconnection(notavailable)
4. RS232:RS232managementconnection(Sub-D9M)
5. DEDICATEDI/O:DedicatedInputs/Outputs(Sub-D9F)
6. Power connector
7. Fuse carrier
8. On/O󰘯switch
9. ID plate
10. SAFETY:emergencystop(optional):M12(male)-12channels
11. USERI/O:GenericInputs/Outputs(Sub-D25F)
12. Safety label
13. OPTION:connection(s)foraccessory(ies):RotaryDevice(cylinderattachment):Sub-D26F-Highdensity
14. ZAXIS:Zaxis(Sub-D15F)
15. MARKING HEAD: head/CCU connecting cable
16. FIELDBUS:󰘰eldbus(optional)

Connections - Installation
15
M_XCOM_EN_B
2. Connections
The di󰓐erent elements of the equipment must be connected with the power o󰓐. The
power supply should be connected last.
TousetheCCU,3connectionsmustbeperformed,inthefollowingorder(minimum):
• Wiringofthe"Stopmarking"contact:SubD9connector(female)-withjumpers
• Markinghead
• Power supply
Wiringofthe"Stopmarking"contact
The machine comes delivered with a SubD 9 point connector with bridge so that it can be used immediately.
It must be connected to the dedicated Inputs/Outputs connector located on the right side of the CCU.
The connector supplied is only used to test the machine. Under normal operating conditions, open the electrical
connectionbetweenpins5and9toactivatethe"Stopmarking"function.Ifthisconnectionisnotperformed,
theStopfunctionisactiveandnomarkingispossible.
ConnectionofthemarkingheadtotheCCU
ConnectthemarkingheadandtheCCUviatheirconnectioncable.Firmlyinserttheplugs,andtightenthe
lockingrings.Checkthattheconnectionisappropriate.
Power supply connection
• Plug the CCU to the power supply using the cable provided.
• Placetheswitchinthe"I"position(On).
The machine is operational.

Connections - Installation
16
M_XCOM_EN_B
3. Hook(s)(DIN):Installationlocation(s)
Units: mm
4. Installation
Switching on the machine
1. Place the switch in the "I" position (On).
A presentation screen will appear for a few seconds, followed by the main menu screen.
Leave the machine powered on, even if it is only going to be used at intervals.
If the machine does not switch on:
• Checkthatthepowercordiscorrectlypluggedintoboththemachineandthepowersupply.
• Checkthatthereispowertothemainsplug.

Connections - Installation
17
M_XCOM_EN_B
Power down
1. Set the general stop button to the "O"(Stop) position.
Switcho󰘯themachineinthefollowingsituations:
• when the operator is permanently leaving the machine
• in the event of physical damage (something is dropped on the machine, 󰘰re, a liquid is spilled on the
machine,etc.)
• mechanical/electrical/electronicfaultssuggestingabreakdown
• if there is a major problem or the machine is jammed mechanically
• themachineisjammedontheparttobeengraved/marked
• themachineisjammedonanobjectintheworkarea
• forced restart
• external/internal cleaning
Restarting
Ifthemachineortheoperatingprogramlocks,themachinemayneedtoberestarted.
1. Switcho󰓐themachine.
2. Wait approximately 30 s.
This waiting time must be respected. It prevents an electric surge likely to damage
the machine's power supply.
3. Switch on the machine.

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M_XCOM_EN_B
K. Using the machine
1. Using the T08 program
The home page is composed of 6 menus, each represented by an icon.
3
4
9
2
5
7
8
6
1
1. Return to previous screen
2. Icon used to return to the main menu, followed by the name of the menu. This icon appears several times in the
program.
3. Menu:Marking
4. Menu: Variables
5. Menu: Hardware
6. Menu: Settings
7. Menu: File management
8. Date/Time
9. Menu:Edit󰘰le
Refer to the user manual for the T08 program.

19
M_XCOM_EN_B
L. Communication
The Control Unit can be used in various modes:
• Human mode: can be used by a human user, who interacts via the Man-Machine Interface with no need
for any other external device.
Description of the human-machine interface: color touch screen and/or Dedicated Inputs/Outputs, Barcode
reader, 2D-code reader.
Example: an operator performs a variety of markings on various pieces, in short runs.
• Independentmode:usedtomarkthesamemarking󰘰leasetnumberoftimes.Itacquiressimpleinformation
fromexternalsources(On/O󰘯,texttobemarked):colortouchscreen,dedicatedInputs/Outputs,barcode
reader, 2D-code reader, serial port, …
Example:anoperatororasimpleautomationperformsmarkingsonsimilarpieces,inmediumtolongruns.
• Controlled mode: when this mode is activated, the machine is controlled directly by a remote peripheral.
The command instructions can be used on a variety of media:
- Ethernet – TCP/IP
- Fieldbus(optional):Pro󰘰net,EthernetIP,othersonrequest
- RS232
Example:a machineintegrated intothe production lineperforms arange ofmarkings on awide varietyof
pieces, in long runs. Two-way communication is extensive.
1. RS232 cable
Serial connection ensures compatibility with the previous generation and with earlier peripherals. Its use is not
recommended for new installations.
Grounding
Grounding
Metallic SubD9F for shielded cables

Communication
20
M_XCOM_EN_B
2. Dedicated Inputs/Outputs
Wiring of the female 9 SubD connector
5
69
1
This connector allows to communicate with the machine. It contains dedicated All-or-Nothing Inputs and
Outputs.Theyareusedinthemarkingcycle(accessoryconnection(buttonboxforstart/stopcycleorstart
cyclefootpedal...)).
Use exclusively shielded cable. Connect the shielding to the electrical ground on
either side of the cable.
Pin functions
Number Description Allocation
1 Internal power supply + 24 V - 300 mA max (common to all
outputs)
2 Relay # 2 Output - Fault
3 Relay # 3 Output-Markinginprogress
4 Input 1 Input-Startmarking
5 Gnd Grounding
6 Relay # 1 Output - Machine ready
7 Common Relay # 1-2
8 Relay # 3 Output-Markinginprogress
9 Input 2 Input-Stopmarking