EPCTA150AM
InstallationManual
MAEN041,2010-12
English
Foreword
Installationmanual forEPCTA150AM
Foreword
The EPC AM TAseries includes compact, mechanically robust, fanless industrial
Panel PCs.
The embedded PC system is available with a 6.4", 10.4" or 15" high-contrast
industrial color TFT display. The analog resistive touch screen is the basis
of communication between human and machine. The combination of a
standardized CPU unit anddifferent front units efficiently meets customer
requirements. Another advantage is the compact installation dimensions, made
possible by using special processors and cooling elements that effectively reduces
the need of temperamental fan systems. Additionally,hard drives are replaced by
internal NAND Flash and SD cards that contributes to a verylow failure quota
despite the often rough industrial conditions.
The EPC AM TA series comes with the Windows® XP Embedded operating
system, which allows you to visualize and control your systems reliably in a harsh
environment.
This manual describes how to install the EPC TA150AM.
Order no: MAEN041
Copyright © 2010-12 Beijer Electronics AB. All rights reserved.
The information in this document is subject to changewithoutnoticeandisprovidedasavailableatthe
time of printing. Beijer Electronics AB, including all its group companies, reserves the right to change any
information without updating this publicatio n. Beijer Electronics AB assumes no responsibility for any
errors that may appear in this document. Read the entire installation manual prior to installing and using
this equipment. Only qualified personnel may install, operate or repair this equipment. Beijer Electronics
AB is not responsible for modified, altered or renovated equipment. Because the equipmenthasawide
range of applications, users must acquire the appropriateknowledgetousetheequipmentproperlyintheir
specific applications. Persons responsible for the application and the equipmentmustthemselves ensure
that each application is in compliance w ith all relevant requirements, standards and legislation in respect to
configuration andsafety. Only parts and accessories manufactured accordingtospecificationsset by Beijer
Electronics AB may be used.
BEIJER ELECTRONICS AB, INCLUDING ALL ITS GROUP
COMPANIES,SHALL NOT BE LIABLE TO ANYONE FOR ANY
DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL
DAMAGES RESULTINGFROMTHE INSTALLATION,USE OR
REPAIROF THIS EQUIPMENT, WHETHER ARISING IN TORT,
CONTRACT, OR OTHERWISE. BUYER'S SOLE REMEDY SHALL BE
THE REPAIR, REPLACEMENT, OR REFUND OF PURCHASEPRICE,
AND THE CHOICE OF THE APPLICABLE REMEDY SHALL BE AT
THE SOLE DISCRETION OF BEIJER ELECTRONICS AB .
BeijerElectronics, MAEN041
Contents
Contents
1 Safety Precautions ....................................................... 4
1.1 General ...........................................................
1.2 During Installation ..............................................
1.3 During Use .......................................................
1.4 Service and Maintenance ........................................
1.5 Dismantling and Scrapping .....................................
2 Installation ............................................................... 6
2.1 Space Requirements .............................................
2.2 Installation Process ..............................................
2.2.1 Other ConnectionsandPeripherals .............................
3 TechnicalData ........................................................... 9
4 ChemicalResistance .................................................... 10
4.1 Metal Casing .....................................................
4.2 Touch Screen and Overlay .......................................
4.2.1 AutotexF157/207 ...............................................
4.2.2 TouchScreenSurface ............................................
4.2.3 AutoflexEB ...................................... ................
5 Panel PCDrawings ..................................................... 13
5.1 CommunicationPorts ...........................................
5.2 EPCTA150 AM Outline ........................................
6 Additional Installation Tips ............................................ 15
6.1 GroundingthePanelPC ........................................
6.2 Ethernet Connection in the PanelPC ..........................
6.3 To Achieve Better EMC Protection .............................
6.4 Ambient Temperature ...........................................
6.5 Safety .............................................................
6.6 GalvanicIsolation ................................................
6.7 Cable and Bus Termination RS485
.............................
8
10
11
11
12
12
13
14
15
16
17
18
19
20
21
4
4
5
5
5
6
6
BeijerElectronics, MAEN041
Safety Precautions
1SafetyPrecautions
Both the installer and the owner and/or operator of the PanelPC must read and
understand this installation manual.
1.1 General
• Read the safety precautions carefully.
• Check the delivery for transportation d amage. If damage is found, notify the
supplier as soon as possible.
• Do not use the Panel PC in an environment with high explosive hazards.
• The supplier is not responsible for modified, altered or reconstructed
equipment.
• Use only parts and accessories manufactured according to specifications of
the supplier.
• Read the installation and operating instructions carefully before installing,
using or repairing the Panel PC.
• Neverallowfluids,metalfilingsorwiringdebristoenteranyopeningsinthe
PanelPC. This may cause fire or electrical shock.
• Only qualified personnel may operate the PanelPC.
• Storing the Panel PC where the temperature is lower/higher than
recommended in this manual can cause the LCD display liquid to
congeal/become isotopic.
• The LCD display liquid contains a powerful irritant. In case of skin contact,
wash immediately with plenty of water. In case of eye contact, hold the eye
open,flushwithplentyofwaterandgetmedicalattention.
• Thefiguresinthismanualservesanillustrativepurpose. Becauseofthemany
variables associated with any particularinstallation, the supplier cannot
assume responsibility for actual use based on the figures.
• The supplier neither guarantees that the Panel PC is suitable for your
particular application, nor assumes responsibilityfor your product design,
installation or operation.
1.2 DuringInstallation
• The Panel PC is designed for stationary installation on a plane surface, where
the following conditions are fulfilled:
– no high explosive risks
– no strong magnetic fields
– no direct sunlight
– no large, sudden temperature changes
• Install the product according to the accompanying installation instructions.
• Ground the product according to the accompanyinginstallation instructions.
• Only qualified personnel may install the PanelPC.
• Separate the high voltage, signal and supply cables.
• Make sure that the voltage and polarity of the power source is correct before
connecting the product to the power outlet.
• Peripheralequipment must be appropriate for the application and location.
BeijerElectronics, MAEN041
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Safety Precautions
1.3 DuringUse
• Keep the PanelPC clean.
• Emergency stop and other safety functions may not be controlled from the
Panel PC.
• Do not use too much force or sharp objects when touching the keys, touch
screenetc.
1.4 ServiceandMaintenance
• Only qualified personnel should carry out repairs.
• The agreed warranty applies.
• Before carryin g out any cleaning or maintenance operations, disconnect the
equipment from the electrical supply.
• Clean the display and s urround ing front cover with a soft cloth and mild
detergent.
• Replacing the battery incorrectly may result in explosion. Only use batteries
recommended by the supplier.
1.5 DismantlingandScrapping
• The Panel PC or parts thereof shall be recycled according
• The following components contain substances that migh
to health and the environment: lithium battery
display.
, electrolytic capacitor and
to local regulations.
t be hazardous
BeijerElectronics, MAEN041
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2Installation
2.1 SpaceRequirements
• Installation plate thickness: 1.5 - 9.0 mm (0.06 - 0.35 inch)
• Space requirements when installing EPC TA150 AM:
100 mm
(4.0 inch)
304 mm
(11.97 inch)
50 mm
(2.0 inch)
100 mm
(4.0 inch)
398 mm
(15.67 inch)
50 mm
(2.0 inch)
60 mm
(2.36 inch)
Installation
100 mm
(4.0 inch)
Caution:
Theopeningsontheenclosureareforairconve
ction. Donotcovertheseopenings.
2.2 InstallationProcess
1.
Unpack and check the delivery . If
Note:
PlacethePanelPConastable surfaceduringinstallation.
Droppingitorlettingitfallmaycausedamage.
damage is found, notify the supplier.
Panel cut out 355.5 x 278.5 mm
(14.0 x 10.96 inch)
x 14
BeijerElectronics, MAEN041
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2.
Place the panel cut out where the Panel PC is to be situated, draw along the
outer sides of the holes and cut according to the markings.
3.
Secure the PanelPC in position, using all the fastening holes and the provided
brackets and screws:
x 14
Installation
0.5 - 1.0 Nm
BeijerElectronics, MAEN041
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Installation
4.
Connect the cables in the spec ified order,according to the drawing and steps
below.
Caution:
• EnsurethatthePanelPCandthecontroller systemhavethesameelectrical
grounding(referencevoltagelevel),otherwiseerrors incommunicationmay
occur.
• ThePanelPCmustbebroughtto ambienttemperaturebeforeitisstartedup. If
condensationforms,ensurethatthePanelPCisdrybefore connectingitto the
poweroutlet.
• Ensurethatthe voltageandpolarityofthe powersource iscorrect.
• Useonlyshieldedcommunication cables.
• Separatehighvoltagecablesfromsignalandsupplycables.
Power
CF CARD
B
1
Controller
RS422/RS485
RS232
24V DC
C
24V DC
D
A
Ethernet
– Connect cable A.
– Connect cable B, using an M5 s crew and a grounding conductor (as short
as possible) with a cross-section of minimum 2.5 mm
– Connect cable C.
– Connect cable D.
5.
Carefully remove the laminatedfilm over the PanelPC display, to avoid static
2
.
electricity thatcould damage the panel.
2.2.1 OtherConnection
sandPeripherals
Cables, peripheralequipment and accessories must be suitable for the application
and its environment. For further details or recommendations, please refer to the
supplier.
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Technical Data
3TechnicalData
Parameter EPCTA150 AM
Frontpanel,WxHxD 398x304x6mm
Mountingdepth 60mm(160mmincludingclearance)
Frontpanelseal IP66
Rear panel seal IP 20
Keyboard
material/Front
panel
Reverse side
material
Weight 3.7 kg
Serialport
RS422/RS485
SerialportRS232C 9-pinD-subcontact,malewithstandardlockingscrews4-40
Ethernet 2xshieldedRJ45
USB HosttypeA(USB2.0),m ax outputcurrent500mA
Memoryslots 1xSDcard
Realtimeclock ±30PPM+errorbecauseofambienttemperature. Total
Powerconsumption
atratedvoltage
Display TFT-LCD.1024x768pixels,64K colors.
Activeareaof
display,W xH
Fuse InternalDCfuse,3.15AT,5 x20mm
Powersupply +24VDC(20-30VDC). Powersupplyconnector.
Ambient
temperature
Storagetemperature -20°to+70°C
Relativehumidity 5-85% non-condensed
Approvalsand
certifications
Touch screen: Polyesteronglass,1millionfingertouch
operations. Overlay: AutotexF157or F207*.
Powder-coatedaluminum
25-pinD-subcontact,chassis-mountedfemalewith
standardlockingscrews4-40UNC
UNC
maximumerror: 77seconds/monthat25°C.
Temperature coefficient: -0.034±0.006ppm/°C
Rechargeablebattery.
Normal: 1.2A
Maximum: 1.7A
CCFLbacklightlifetimeatthe ambienttemperatureof
+25°C:>35,000h.
304.1x228.1mm
CE:Thepowersupplym ust conformwiththerequirements
accordingtoIEC60950andIEC 61558-2-4.
ULandcUL:The powersupplymustconform withthe
requirementsforclassIIpower supplies.
Verticalinstallation: 0 °to+50°C
Horizontalinstallation: 0°to+40°C
Informationisavailableonthewebsite
www.beijerelectronics.com
2
*SeesectionChemicalResistanceformoreinformation.
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Chemical Resistance
4 ChemicalResistance
4.1 MetalCasing
The frame and casing material is powder-coated aluminum. This powder paint
withstands exposure to the following chemicals without visible change:
Aceticacid10% Phosphoricacid4%
Citricacid10% Phosphoricacid10%
Diesel Seawater
Distilledwater Sodiumchloride2%
Edibleoil Sodiumchloride20%
Fueloil Sulphuricacid20%
Hydrogenperoxide3% Tap water
The powder paint shows limited resistance to the f
ollowing chemicals at room
temperature:
Butanol Nitricacid3%
Hydrochloricacid5% Nitricacid10%
Isopropylalcohol Phosphoricacid43%
Na-hypochlorite10% Turpentine
Note:
Ifexposure toanyof theabove chemicalsisdemanded,itis recommendedtofirsttest
thechemicalonan“invisible”spotofthemetalcasing.
Thepowderpaintshowslittleornoresistancetothefollowingchemicalsatroom
temperature:
Aceticacid,conc. Methyl-ethyl ketone Toluene
Acetone Nitricacid30% Trichlorethylene
Ammonia5% Phenol Xylene
Ammonia,conc. Sodiumhydroxide5% 97octanunleadedpetrol
Ethylacetate Sodiumhydroxide30% 98octanleaded petrol
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Chemical Resistance
4.2 TouchScreenandOverlay
4.2.1 AutotexF157/207
Autotex F157 or F207 covers the overlay surrounding the touch screen.
SolventResistance
Autotex F157/F207 withstands exposure of more than 24 hours duration under
DIN42115Part2tothefollowingchemicalswithoutvisiblechange:
Acetonitrile DieselDowney/Lenor
Ajax/Viminsolution EthanolPotassiumferricyanide
Alkalicarbonatesolution1Glycerine Potassiumhydroxide
Ammonia(<40%)
Aceticacid(<50%) Gumption
Arielpowderinsolution
1
Bleach
Castoroil Methanol Trichloroaceticacid
Causticsoda(<40%)
Cuttingoil Paraffinoil Windex
Cyclohexanol Persilpowderinsolution1Wisk
Diacetonealcohol Petroleumspirit
1
Extremelyfaintglossingofthetexturewas noted.
1
1
Glycol PureTurpentine
1
1
Hydrochloricacid(<36%) Sulfuricacid(<10%)
Linseedoil To ma to ketchup
Nitricacid(<10%) WhiteSpirit
1
Phosphoricacid(<30%)
(<30%)
SBP60/95
(<50%)
1
-
1
1
Autotex withstands DIN 42 115 Part 2 exposure of up to 1 hour duration to glacial
acetic acid without visible change.
Autotex is no
t resistant to high pressure steam at over 100 °C or the following
chemicals:
Concentratedmineralacids Benzylalcohol
Concentratedcausticsolution Methylenechloride
OutdoorUse
In common with all polyester based films Autotex F157/F207 is not suitable for
use in conditions of long term exposure to direct sunlight.
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Chemical Resistance
4.2.2 TouchScreenSurface
Thetouchscreensurfaceonthepanelwithstandsexposuretothefollowing
solvents without visible change:
Solvents Time
Acetone 10minutes
Isopropanol 10minutes
Toluene 5 hours
4.2.3 AutoflexEB
It is recommended to use the Autoflex EB touch display protection film, that can
be ordered from Beijer Electronics.
SolventResistance
Autoflex EB withstands exposure to the same chemicals as Autotex F157 or F207
according to section Autotex F157/207.
OutdoorUse
In common with all polyester based films Autotex EB is not suitable for use in
conditions of long term exposure to direct sunlight.
BeijerElectronics, MAEN041
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5 PanelPCDrawings
5.1 CommunicationPorts
RS-232
PanelPC Drawings
RS-422/485
USB
RS-422
RS-485
Ethernet
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5.2 EPCTA150AMOutline
COM1
RS422/485
Ethernet
PanelPC Drawings
COM2
24 VDC
RS232
Ethernet
398
6 60
max 9 mm material thickness
22
304
USB Host
BeijerElectronics, MAEN041
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14277
14
14
Additional Installation Tips
6 AdditionalInstallationTips
When experiencingcommunication problems in for example noisy environments
or when operating close to temperature limits, the following recommendations
are to be noticed.
6.1 GroundingthePanelPC
Mounting plate in the cabinet
Power supply
24 V DC
5350
Panel PC
1
Door
Ferrite core
6
3
2
5
4
The Panel PC’smounting clamps do not provide a secure grounding connection
between the Panel PC and the device cabinet, s ee 1 in drawing above.
1.
Connect a 2.5 mm
panel chassis, see 2 in drawing abov
2.
Connect a 6 or 4 mm
2
wire between the Pan
el PC’squick-connect plinth and the
e.
2
wire or grounding braid between the panel’s chassis and
the closest grounding point on the door,see 3 in drawing above.
3.
Connect a strong but short grounding braid between the door and the device
cabinet,see 4 in drawing above.
4.
Twist the cables onto the 24 V DC feed, see 5 in drawing above.
2 turns around the ferrite core provide 4 times the suppression of 1 turn.
3 turns around the ferrite core provide 9 times the suppression of 1 turn.
A ferritecore suppresses disturbancesto the 24 V feed, see 6 in drawing above.
Note:
Thegroundingwiresshouldbeshortandtheconductorshouldhavealargearea.
Along,thingroundingw ire hasaveryhigh impedance(resistance)athighfrequencies
andwillnotguidedisturbancestotheground.
Multi-wireconductorsarebetterthansinglewireconductorswiththesamearea.
Abraidedconductorwirewiththesame areaisevenbetter. Thebestisashort,thick
groundingbraid.
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Additional Installation Tips
6.2 EthernetConnectioninthePanel PC
Industrial Ethernet
RJ45
RJ45
RJ45
RJ45
Panel PC
RJ45
1
2
Panel PC
RJ45
Panel PC
RJ45
Panel PC
RJ45
5351
Shielded
0.1 uF
250 V
3
4
1-1
2-2
3-3
8-8
Short and
unshielded
5
In some industrial units for Ethernet, the RJ45 contact’s shield is connected to the
chassis via a capacitor, see 1 in drawing above.
The Panel PC’s Ethernet shield is directly co
nnected to the chassis, see 2 in
drawing above.
1.
Check whether the other Ethernet unit has its shield directly grounded or
grounded via a capacitor.
Note:
Inmanycases,connectingthe shieldedEthernetcablingtothe chassisatbothendsis
inappropriate. Humorgroundingloops canoccur. Unshieldedcablingmayevenresult
infewercommunicationerrors.
A good solution may be to use a shielded Ethernet cable, but to connect the shield
at one end only.
One option is to break the shield, see 3 in drawing above.
A more elegant method is to expand the shielded Ethernet cablingwith a piece of
unshielded Ethernet cable, see 4 in drawing above.
You can ground the shield via an external 0.1 uF/250 V plastic capacitor,see 5 in
drawing above. Thiswill connect the HF transients to the ground.
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Additional Installation Tips
6.3 ToAchieveBetterEMCProtection
• Initially, use the original cabling from Beijer Electronics primarily.
• Useshielded cables for RS232 communication.
• Usetwisted pair and shielded cabling for RS422 and RS485.
• Usethe cabling intendedfor the bus type; Ethernet, Profibus, CC-Link,
CAN, Device Net etc.
• Install and connect according to applicable specifications for the relevant bus
standard.
• Useshielded cabling for Ethernet, preferably with foil + braided shield.
• D-sub covers should be shielded, and t he shield should be connected to the
cover 360 ° where the cable comes in.
• Connect the shield at both ends.
Shielded cable
0.1 uF/250 V
Ground plane 1 Ground plane 2
Ground plate Ground plate
Not same potential
in another building
5352
With longer distances, there is a risk that the ground potential ma y be different.
In that case, the shield should only be connected at one end. A good alternative
is to connect the other end of the shield to the ground via a 0.1 uF/250 V plastic
capacitor. Both ends are then connected to the ground in terms of HF, but only
connected to the ground at one end in terms of LF, thus avoiding the 50 Hz
grounding loops.
Metal cabinet Metal cabinet
Terminal or connector Terminal or connector
Cable clamp
in steel
Short distance
EMC cable gland Plastic cable gland
Shielded cable Shielded cable
1.
Usean EMC cable gland or regular plastic cable g land,remove the outer jacket
5353
and connect the shield to the installation plate with a 360 ° metal cable clamp.
2.
Place the 24 V DC and communications cabling in one cable trunk/cableduct
and 230/380 V AC in another. If the cables need to be crossed, cross them at
90 ° only. Avoid combining the cabling for stronger 24 V DC outputs with
the communicatio n cabling.
Ferritecores that are snapped onto the shielded cabling may removeminor
disturbances. Large ferrite pieces that are snapped onto unshielded cabling and
where the wires go 2-4 times around the cores are approximately 5-25 times more
efficient.
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Additional Installation Tips
6.4 AmbientTemperature
The maximum ambient temperature for the PanelPC is provided in the
specifications. The ambient temperaturerefers to the temperature in the device
cabinet whichcools thePanelPC’selectronics.
Top
50 °C inside
Panel
PC
30 °C outside
Middle
45 °C inside
Bottom
40 °C inside
Power
Power
Power
Axial fan
120 x 120 mm
Airflow
5354
Inmostcases,theambienttemperatureforthePanelPCissignificantlyhigher
than the device cabinet’sambient temperature.
If the cabinet is tall and there are a number of heat
temperature at the top of the cabinet will be cons
theoretical temperature increase th at would b
sensitivetoheat. Thelifespanofanelectrol
° increase in temperature. A 15-20 ° temperat
-generating devices,the
iderably higher than the
e expected. All electronicsare
ytic capacitor is cut in half with an 8-10
ure increase results in a quar ter of the
lifespan etc.
Rittal has a good program for estimating the anticipated average temperature in
the cabinet as well as a large program for controlling the temperature in the device
cabinet.
An enamel-coated steel cabinet has
a radiant heat value of 5.5 W/m
2
and degrees
C.
Installing a fan inside the cabinet will even out the temperature, while moving air
provides considerably better cooling than still air. A suitable fan is a 120 x 120 mm
axial fan, available in 24 V DC, 115 and 230 V AC.
Installthefansothatitsit
Panel PC. If the fan is mount
temperaturewillbehighe
s in the coolerarea and will blow cold air against the
ed at the top and sucks air upwards, the fan’s ambient
r=shorterlifespan.
Agoodfanwithaball-bearingmountinghasanexpectedlifespanofatleast
40,000 hours (not a guaranteed lifespan) at 40 °C. This corresponds to at least 4
years of continuous use. If a thermostat is installed, the fan only needs to come
on when needed.
Large graphic termi
lighting is off. The
nals draw only one fifthof the current when the background
loss effect drops from e.g. 25 W to only 5 W.
The Panel PC’sloss effect = supply voltage x current. Virtually no power goes to
external users and no loss effects due to inputs.
BeijerElectronics, MAEN041
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6.5 Safety
Most of the Panel PCs are fed with 24 V DC.
Power supply
1
2
3
230 V AC to 24 V DC
Power supply
230 V AC to 24 V DC
Power supply
230 V AC to 24 V DC
230 V AC
+24 V
0 V
4
+24 V
0 V
4
Distance?
+24 V
0 V
4
Panel PC
Panel PC
Panel PC
Small controller with expansion unit
COM1
COM100
Ch0
Ch1
Ch100
Ch101
5355
Additional Installation Tips
If you use a power supply that meets safety standardsandonlyfeedsthePanelPC,
there is no problem. See 1 in drawing above.
However,ifyouhavea24Vunitthatalsofeedsotherunits,thereisreasontobe
cautious, see2 in drawing above. The Panel PC does not haveinsulation that
meets safety requirements in the event of a potential short circuit between 230 V
AC and 24 V DC. It is assumed that the 24 V feed is secure, for example, SELV
according to EN 60950 (protection against electric shock) and UL 950.
Example:
Hereisanexamplethatexplainswhyasecure 24VDCfeed canberuinedby mixing24
Vrelaycontactswith230VACrelaycontactsinasmallercontroller. Checkthatthe
“clearancesandcreepagedistancesbetween24VDCand230VACfulfillEN60950orUL
950”. Ifnot,inputa separate24VunitintothePanelPC.
If there is a substant
AC, it is OK to use the
ial distance between the relay contacts for 24 V DC and 230 V
same 24 V devices for all feeds. See 3 in drawing above.
Connect 0 V on the 24 V feed to the ground, see 4 in drawing above. This offers
three advantages:
• Safety is increa
connection or s
• Tr a n s i e n t s o n t
• No risk that th
is not unusua
sed. The24Vfeedwillnotbeliveintheeventofafaulty
hortcircuitbetween0V(24V)and230Vphase.
he 24 V feed are connected to the ground.
e 24 V feed is at a highlevel in relationship to the ground. This
l since there is high static electricity.
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6.6 GalvanicIsolation
r
Additional Installation Tips
+24 V DC
DC/DC
galvanic isolation
Filter
0 V
1.5 m
Internal electronic
VCC
0 V (GND)
RS232RS422/485
USB
USB
DC/AC
Ethernet
CFL
5356
The Panel PC has galvanic isolation against the 24 V DC feed but no galvanic
isolation between the communication ports for RS232, RS422/485 and USB.
Only the Ethernet connection has galvanic isolation.
Panel PC Modular controller Printe
RS422 RS232 USB
**
* *
Not same ground potential
* = Internal 0 V (GND) connection
When a PC is connected to the panel, the panel’sinternal 0 V (G
*
Power CPU COM COM2
***
*
PCPC
5357
ND) will be
connected to the protective ground via the PC.
A number of USB devices can have the shield connected together with th e
protective ground. Here, the panel’s 0 V (GND) is connected to th e protective
ground when, for example, a USB memory stick, keyboard or similar device is
plugged in.
If a number of units are connected that have a 0 V a
these are connected to various grounding poin
problems. Grounding currents go through com
of the controller,and internallyin th
e Panel PC, and can cause errors.
nd a ground connection, and
ts, there is a substantial risk of
munication cables, the rear plate
Use external units to improve communication and achieve galvanic isolation.
Westermo has good industry-standard insulators that are also insulated from the
24 V DC feed.
Note:
Itisveryimportanttomakesurethat the24V feedintheexternalinsulation unitisnot
connectedtoone ofthecommunication outlets. Ifit doesnothave 100%insulation
againstthe24Vfeed,disturbancesandgroundingcurrentsfromthe0Vonthe24V
sidewilldisruptcommunication.
Usingthistypeofunitsolvesoneproblembutcreatesalarger problem! Asubstandard
installationmayworknow,butproblemsmayarisewhenother devicesareconnected.
BeijerElectronics, MAEN041
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Additional Installation Tips
6.7 CableandBusTerminationRS485
• Use shielded and twisted pair cable. The pair capacitance may not exceed 52.5
2
pF/m and area at least 0.25 mm
(AWG 24), if you want to use the maximum
transfer distance and maximum transfer speed.
• 0 V, the reference voltage for communication should be included in
the cabling. With two-way communication use two pairs; one pair for
communication and one pair fo r 0 V.
• The shield must be grounded atone end. The other end is usually grounded,
but with longer distances or when there is a difference in the ground potential,
theshieldshouldbeconnectedtothegroundvia0.1uF/250Vplastic
capacitor to prevent ground current in the braided shield. A number of
manufacturers recommend that the shield be grounded at each node. Various
manufacturers have different systemsfor bus termination. The RS485
standard does not describe how the “Fail Safe” f unctionwould be carried out,
justthatthesystemshouldbeabletohandletheerror.
Depending on the recipients’design, the bus wires may be on the same level or
require pull-up or pull-down to e nsure that no faulty signals are detected when the
bus is in resting mode (all transmitters are disconnected).
Inside Panel PC
+5 V
0 V
1 23
1 K
120 ohm 120 ohm
1 K
+5 V
(120 ohm)
14
1 K
2
15
6
19
1 K
7
8
0 V
0 V
4
55
17
50
Panel PC
RS422
1 2 3 4 5 6 7 8
CAB8CAB8 Bus
2
15
3
16
17
4
14
+5 V
VCC
8
0 V
7
0 V
VCC
1 K
120 ohm
1 K
RS485
1
2
3
4
5
6
Shield
7
8
Bus termination
0 V
0 V
5358
Some (older) operator panels had pull-up and pull-downresistance except for
the actual bus termination at 120 ohm, similar to Westermoand Profibus. See 1
in drawing above.
The Panel PCs have another type of recipient, so-called built-in “FailSafe”,where
simple bus termination resistance issufficient. See 2 in drawing above.
If other nodes on the RS485 network require pull-up and pull-down and the Panel
PC is at one end of the loop, one of the following procedures can be carried out:
• Connect two 1k/0.25 W resistors in the 25-pole D-sub contact. See 3 in
drawing above. Set jumper pins 6-19.
• UseCAB8. It offers the option of bus termination with pull-up/-down. It
isalsoeasytoconnectthebuscableviathescrewterminalblock. See4in
drawing above.
BeijerElectronics, MAEN041
21
Headoffice
BeijerElectronicsAB
Box426
20124Malmö,Swed
en
www.beijerelectronics.com/+4640358600
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