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iX Panel T40
Installation Manual
MAEN992, 2009-10
English
Foreword
Installation manual for iX Panels
Foreword
All iX Panels are developed to satisfy the demands of human-machine communication. Built-in functions such as displaying and controlling text, dynamic indication,
time channels, alarm and recipe handling are included.
The operator panel works primarily in an object-oriented way, making it easy to understand and use. Configuration is carried out on a PC using iX Developer configuration tool. The project can then be transferred and stored in the operator panel itself.
Various types of automation equipment such PLCs, servos or drives can be connected
to the iX Panel. In this manual, the term “the controller” refers to the connected
equipment.
This manual explains how to install the operator panel. Please refer to the reference
manual for further information.
FCC Compliance Information
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to
part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates, uses,
and can radiate radio frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which case the user will be required to correct the
interference at user's own expense.
Any modification to this equipment not expressly approved by QSI could void the user's authority to operate
the equipment.
© Beijer Electronics AB, MAEN992, 2009-10
The information in this document is subject to change without notice and is provided as available at the time
of printing. Beijer Electronics AB reserves the right to change any information without updating this
publication. 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 equipment has a wide range of applications, users must acquire the appropriate knowledge to use
the equipment properly in their specific applications.
Persons responsible for the application and the equipment must themselves ensure that each application is in
compliance with all relevant requirements, standards and legislation in respect to configuration and safety.
Only parts and accessories manufactured according to specifications set by Beijer Electronics AB may be used.
BEIJER ELECTRONICS AB SHALL NOT BE LIABLE TO ANYONE FOR ANY DIRECT, INDIRECT,
SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM THE
INSTALLATION, USE OR REPAIR OF THIS EQUIPMENT, WHETHER ARISING IN TORT,
CONTRACT, OR OTHERWISE. BUYER'S SOLE REMEDY SHALL BE THE REPAIR,
REPLACEMENT, OR REFUND OF PURCHASE PRICE, AND THE CHOICE OF THE APPLICABLE
REMEDY SHALL BE AT THE SOLE DISCRETION OF BEIJER ELECTRONICS AB.
Beijer Electronics, MAEN992
Table of Contents
Table of Contents
1 Safety Precautions.................................................................................
1.1 General .............................................................................................
1.2 During Installation............................................................................
1.3 During Use .......................................................................................
1.4 Service and Maintenance...................................................................
1.5 Dismantling and Scrapping...............................................................
2 Installation ...........................................................................................
2.1 Space Requirements ..........................................................................
2.2 Installation Process............................................................................
5
5
5
6
6
6
7
7
7
2.2.1 Mode Switches .................................................................................................. 9
2.2.2 Connections to the Controller ........................................................................... 9
2.2.3 Other Connections and Peripherals ................................................................... 9
3 Technical Data ................................................................................... 11
4 Chemical Resistance ........................................................................... 13
4.1 Metal Casing................................................................................... 13
4.2 Touch Screen and Overlay .............................................................. 13
4.2.1 Autotex F157/F207 ......................................................................................... 13
4.2.2 Touch Screen Surface ...................................................................................... 14
4.2.3 Autoflex EB ..................................................................................................... 14
5 Operator Panel Drawings ...................................................................
5.1 Communication Ports.....................................................................
5.2 iX Panel T40 Outline......................................................................
6 Additional Installation Tips................................................................
6.1 Grounding the Operator Panel .......................................................
6.2 Ethernet Connection in the Panel ...................................................
6.3 To Achieve Better EMC Protection ................................................
6.4 Ambient Temperature.....................................................................
6.5 Safety ..............................................................................................
6.7 Cable and Bus Termination RS485.................................................
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Table of Contents
Beijer Electronics, MAEN992
Safety Precautions
1
Safety Precautions
Both the installer and the owner and/or operator of the operator panel must read and
understand this installation manual.
1.1 General
– Read the safety precautions carefully.
– Check the delivery for transportation damage. If damage is found, notify the
supplier as soon as possible.
– Do not use the operator panel 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 operator panel.
– Never allow fluids, metal filings or wiring debris to enter any openings in the
operator panel. This may cause fire or electrical shock.
– Only qualified personnel may operate the operator panel.
– Storing the operator panel 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, flush
with plenty of water and get medical attention.
– The figures in this manual serves an illustrative purpose. Because of the many
variables associated with any particular installation, the supplier cannot assume
responsibility for actual use based on the figures.
– The supplier neither guarantees that the operator panel is suitable for your
particular application, nor assumes responsibility for your product design,
installation or operation.
1.2 During Installation
– The operator panel 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 accompanying installation instructions.
– Only qualified personnel may install the operator panel.
– 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.
– Peripheral equipment must be appropriate for the application and location.
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5
Safety Precautions
1.3 During Use
– Keep the operator panel clean.
– Emergency stop and other safety functions may not be controlled from the
operator panel.
– Do not use too much force or sharp objects when touching the keys, touch screen
etc.
1.4 Service and Maintenance
– Only qualified personnel should carry out repairs.
– The agreed warranty applies.
– Before carrying out any cleaning or maintenance operations, disconnect the
equipment from the electrical supply.
– Clean the display and surrounding 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 Dismantling and Scrapping
– The operator panel or parts thereof shall be recycled according to local regulations.
– The following components contain substances that might be hazardous to health
and the environment: lithium battery, electrolytic capacitor and display.
6
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Installation
2
Installation
2.1 Space Requirements
– Installation plate thickness: 1.5 - 7.2 mm (0.06 - 0.28 inch)
– Space requirements when installing the operator panel:
100 mm
(4.0 inch)
119 mm
(4.69 inch)
50 mm
(2.0 inch)
100 mm
(4.0 inch)
50 mm
(2.0 inch)
100 mm
(4.0 inch)
155.8 mm
(6.13 inch)
57 mm
(2.24 inch)
Caution
The openings on the enclosure are for air convection. Do not cover these
openings.
2.2 Installation Process
1. Unpack and check the delivery. If damage is found, notify the supplier.
Panel cut out 139 x 105 mm
(5.47 x 4.13 inch)
x4
Note:
Place the operator panel on a stable surface during installation.
Dropping it or letting it fall may cause damage.
2. Place the panel cut out where the operator panel is to be situated, draw along the
outer sides of the holes and cut according to the markings.
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7
Installation
3. Secure the operator panel in position, using all the fastening holes and the
provided brackets and screws:
x4
0.5 - 1.0 Nm
4. Connect the cables in the specified order.
A
B
C
D
Caution
Ensure that the operator panel and the controller system have the
same electrical grounding (reference voltage level), otherwise errors
in communication may occur.
Use an M5 screw and a grounding conductor (as short as possible)
with a cross-section of minimum 2.5 mm2.
Caution
- Use only shielded communication cables.
- Separate high voltage cables from signal and supply cables.
Caution
- The operator panel must be brought to ambient temperature
before it is started up. If condensation forms, ensure that the
operator panel is dry before connecting it to the power outlet.
- Ensure that the voltage and polarity of the power source is correct.
B
Power
Controller
RS422/
RS485
RS232
24V DC
24V DC
C
D
A
Ethernet
5. Carefully remove the laminated film over the operator panel display, to avoid
static electricity that could damage the panel.
8
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Installation
2.2.1 Mode Switches
All mode switches must be in OFF position during operator panel use.
The mode switches should not be touched unless by qualified personell.
ON DIP
1 2 3 4
ON DIP
1 2 3 4
2.2.2 Connections to the Controller
For information about the cables to be used when connecting the operator panel to
the controller, please refer to the help file for the driver in question.
2.2.3 Other Connections and Peripherals
Cables, peripheral equipment 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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Installation
10
Beijer Electronics, MAEN992
Technical Data
3
Technical Data
Parameter
iX Panel T40
Front panel,
WxHxD
155.8 x 119 x 6 mm
Mounting
depth
57 mm (157 mm including clearance)
Front panel
seal
IP 66
Rear panel
seal
IP 20
Touch screen
material
Touch screen: Polyester on glass, 1 million finger touch operations.
Overlay: Autotex F157/F207 *.
Reverse side
material
Powder-coated aluminum
Weight
0.6 kg
Serial port
RS422/RS485
25-pin D-sub contact, chassis-mounted female with standard locking screws
4-40 UNC.
Serial port
RS232C
9-pin D-sub contact, male with standard locking screws 4-40 UNC.
Ethernet
Shielded RJ 45
USB
Host type A (USB 1.1), max output current 500 mA
Real time
clock
±20 PPM + error because of ambient temperature and supply voltage.
Total maximum error: 1 min/month at 25 °C
Temperature coefficient: -0.034±0.006 ppm/°C2
Real time
clock battery
CR2450 (UL and cUL: Sanyo or Panasonic)
Minimum lifetime: 3 years
Power
consumption
at rated
voltage
Normal: 0.15 A
Maximum: 0.35 A
Display
TFT-LCD. 320 x 240 pixels, 64K colors.
LED backlight lifetime at the ambient temperature of +25 °C: >10,000 h.
Active area of
display,
WxH
70.1 x 52.6 mm
Fuse
Internal DC fuse, 2.0 AT, 5 x 20 mm
Power supply
+24 V DC (20 - 30 V DC). Power supply connector.
CE: The power supply must conform with the requirements according to IEC
60950 and IEC 61558-2-4.
UL and cUL: The power supply must conform with the requirements for class
II power supplies.
Ambient
temperature
Vertical installation: 0 ° to +50 °C
Horizontal installation: 0 ° to +40 °C
Storage
temperature
-20 ° to +70 °C
Relative
humidity
5 - 85 % non-condensed
Approvals and
certifications
Information is available on the web site
* See section Chemical Resistance for more information.
Beijer Electronics, MAEN992
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Technical Data
12
Beijer Electronics, MAEN992
Chemical Resistance
4
Chemical Resistance
4.1 Metal Casing
The frame and casing material is powder-coated aluminum. This powder paint
withstands exposure to the following chemicals without visible change:
Acetic acid 10%
Phosphoric acid 4%
Citric acid 10%
Phosphoric acid 10%
Diesel
Sea water
Distilled water
Sodium chloride 2%
Edible oil
Sodium chloride 20%
Fuel oil
Sulphuric acid 20%
Hydrogen peroxide 3%
Tap water
The powder paint shows limited resitance to the following chemicals at room
temperature:
Butanol
Nitric acid 3%
Hydrochloric acid 5%
Nitric acid 10%
Isopropyl alcohol
Phosphoric acid 43%
Na-hypochlorite 10%
Turpentine
Note:
If exposure to any of the above chemicals is demanded, it is recommended to first test
the chemical on an “invisble” spot of the metal casing.
The powder paint shows little or no resistance to the following chemicals at room
temperature:
Acetic acid, conc.
Methyl-ethyl ketone
Toluene
Acetone
Nitric acid 30%
Trichlorethylene
Ammonia 5%
Phenol
Xylene
Ammonia, conc.
Sodium hydroxide 5%
97 octan unleaded petrol
Ethyl acetate
Sodium hydroxide 30%
98 octan leaded petrol
4.2 Touch Screen and Overlay
4.2.1 Autotex F157/F207
Autotex F157 or F207 covers the overlay surrounding the touch screen.
Solvent Resistance
Autotex F157/F207 withstands exposure of more than 24 hours duration under DIN
42 115 Part 2 to the following chemicals without visible change:
Acetonitrile
Ajax / Vim in solution
Alkalicarbonate
solution1
Ammonia (<40%)1
Beijer Electronics, MAEN992
Diesel Downey / Lenor1
Phosphoric acid (<30%)
Ethanol
Potassium ferricyanide
Glycerine
Potassium hydroxide (<30%)
Glycol
Pure Turpentine
13
Chemical Resistance
Acetic acid (<50%)
Gumption1
SBP 60/951
Ariel powder in solution1
Hydrochloric acid (<36%)
Sulfuric acid (<10%)
Linseed oil
Tomato ketchup
1
Bleach
Castor oil
Methanol
Trichloroacetic acid (<50%)
Caustic soda (<40%)
Nitric acid (<10%)
White Spirit
Cutting oil
Paraffin oil
Windex1
Cyclohexanol
Persil powder in solution1
Wisk
Diacetone alcohol
Petroleum spirit1
-
1
1
Extremely faint glossing of the texture was noted.
Autotex withstands DIN 42 115 Part 2 exposure of up to 1 hour duration to glacial
acetic acid without visible change.
Autotex is not resistant to high pressure steam at over 100 °C or the following
chemicals:
Concentrated mineral acids
Benzyl alcohol
Concentrated caustic solution
Methylene chloride
Outdoor Use
In common with all polyester based films Autotex F157/F207 is not suitable for use
in conditions of long term exposure to direct sunlight.
4.2.2 Touch Screen Surface
The touch screen surface on the panel withstands exposure to the following solvents
without visible change:
Solvents
Time
Acetone
10 minutes
Isopropanol
10 minutes
Toluene
5 hours
4.2.3 Autoflex EB
It is recommended to use the Autoflex EB touch display protection film, that can be
ordered from Beijer Electronics.
Solvent Resistance
Autoflex EB withstands exposure to the same chemicals as Autotex F157 or F207
according to section Autotex F157/F207.
Outdoor Use
In common with all polyester based films Autoflex EB is not suitable for use in
conditions of long term exposure to direct sunlight.
14
Beijer Electronics, MAEN992
Operator Panel Drawings
5
Operator Panel Drawings
5.1 Communication Ports
RS-232
RS-422
RS-485
RS-422/485
USB
Ethernet
Drawing No. S-05005, Date 2004-10-27
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Operator Panel Drawings
5.2 iX Panel T40 Outline
Drawing No. P-06593, Date 2005-10-05
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Beijer Electronics, MAEN992
Additional Installation Tips
6
Additional Installation Tips
When experiencing communication problems in for example noisy environments or
when operating close to temperature limits, the following recommendations are to be
noticed.
6.1 Grounding the Operator Panel
Door
Mounting plate in the cabinet
Operator panel
3
2
Power supply
1
24 V DC
Ferrite core
5
6
4
1. The operator panel’s mounting clamps do not provide a secure grounding connection between the panel and the device cabinet.
2. Connect a 2.5 mm2 wire between the operator panel’s quick-connect plinth and
the panel chassis.
3. Connect a 6 or 4 mm2 wire or grounding braid between the panel’s chassis and
the closest grounding point on the door.
4. Connect a strong but short grounding braid between the door and the device
cabinet.
5. Twist the cables onto the 24 V DC feed.
6. A ferrite core suppresses disturbances to the 24 V feed.
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.
Remember:
The grounding wires should be short and the conductor should have a large area.
A long, thin grounding wire has a very high impedance (resistance) at high frequencies
and will not guide disturbances to the ground.
Multi-wire conductors are better than single wire conductors with the same area.
A braided conductor wire with the same area is even better.
The best is a short, thick grounding braid.
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Additional Installation Tips
6.2 Ethernet Connection in the Panel
Industrial Ethernet
RJ45
RJ45
1
RJ45
RJ45
Operator panel
RJ45
3
2
Operator panel
RJ45
4
Shielded
1-1
2-2
3-3
Short and
unshielded
Operator panel
RJ45
8-8
5
Operator panel
RJ45
0.1 uF
250 V
5351
1. In some industrial units for Ethernet, the RJ45 contact’s shield is connected to
the chassis via a capacitor.
2. The operator panel’s Ethernet shield is directly connected to the chassis.
Check whether the other Ethernet unit has its shield directly grounded or grounded
via a capacitor.
In many cases, connecting the shielded Ethernet cabling to the chassis at both ends
is inappropriate. Hum or grounding loops can occur. Unshielded cabling may even
result in fewer communication errors.
A good solution may be to use a shielded Ethernet cable, but to connect the shield at
one end only.
3. One option is to break the shield.
4. A more elegant method is to expand the shielded Ethernet cabling with a piece
of unshielded Ethernet cable.
5. You can ground the shield via an external 0.1 uF/250 V plastic capacitor. This
will connect the HF transients to the ground.
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Beijer Electronics, MAEN992
Additional Installation Tips
6.3 To Achieve Better EMC Protection
–
–
–
–
–
–
–
–
Initially, use the original cabling from Beijer Electronics primarily.
Use shielded cables for RS232 communication.
Use twisted pair and shielded cabling for RS422 and RS485.
Use the cabling intended for the bus type; Ethernet, Profibus, CC-Link, CAN,
Device Net etc.
Install and connect according to applicable specifications for the relevant bus standard.
Use shielded cabling for Ethernet, preferably with foil + braided shield.
D-sub covers should be shielded, and the 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
Not same potential
5352
Ground plate
Ground plate
in another building
With longer distances, there is a risk that the ground potential may 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
Terminal or
connector
Terminal or
connector
Short distance
Metal cabinet
EMC cable gland
Shielded cable
Cable clamp
in steel
Plastic cable gland
Shielded cable
5353
– Use an EMC cable gland or regular plastic cable gland, remove the outer jacket
and connect the shield to the installation plate with a 360 ° metal cable clamp.
– Place the 24 V DC and communications cabling in one cable trunk/cable duct 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 communication cabling.
– Ferrite cores that are snapped onto the shielded cabling may remove minor 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 Ambient Temperature
The maximum ambient temperature for the operator panel is provided in the
specifications. The ambient temperature refers to the temperature in the device
cabinet which cools the panel’s electronics.
Operator
panel
Top
50° inside
Power
Power
Axial fan
30°C outside
120x120 mm
Middle
45° inside
Airflow
Power
Bottom
40° inside
5354
In most cases, the ambient temperature for the operator panel is significantly higher
than the device cabinet’s ambient temperature.
If the cabinet is tall and there are a number of heat-generating devices, the
temperature at the top of the cabinet will be considerably higher than the theoretical
temperature increase that would be expected. All electronics are sensitive to heat. The
lifespan of an electrolytic capacitor is cut in half with an 8-10 ° increase in
temperature. A 15-20 ° temperature increase results in a quarter 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/m2 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.
Install the fan so that it sits in the cooler area and will blow cold air against the
operator panel. If the fan is mounted at the top and sucks air upwards, the fan’s
ambient temperature will be higher = shorter lifespan.
A good fan with a ball-bearing mounting has an expected lifespan of at least 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 terminals draw only one fifth of the current when the background
lighting is off. The loss effect drops from e.g. 25 W to only 5 W.
The operator panel’s loss effect = supply voltage x current. Virtually no power goes
to external users and no loss effects due to inputs.
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Beijer Electronics, MAEN992
Additional Installation Tips
6.5 Safety
Most of the operator panels are fed with 24 V DC.
Power supply
230 V AC to 24 V DC
Operator panel
+24 V
0V
1
4
Power supply
230 V AC to 24 V DC
Operator panel
+24 V
2
0V
4
Distance?
Power supply
230 V AC to 24 V DC
Operator panel
+24 V
3
0V
4
COM1
Small controller with expansion unit
Ch0
Ch1
230 V AC
COM100
Ch100
Ch101
5355
1. If you use a power supply that meets safety standards and only feeds the operator
panel, there is no problem.
2. However, if you have a 24 V unit that also feeds other units, there is reason to be
cautious.
The operator panel does not have insulation 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:
Here is an example that explains why a secure 24 V DC feed can be ruined by mixing 24
V relay contacts with 230 V AC relay contacts in a smaller controller. Check that the
“clearances and creepage distances between 24 V DC and 230 V AC fulfill EN 60950 or
UL 950”. If not, input a separate 24 V unit into the operator panel.
3. If there is a substantial distance between the relay contacts for 24 V DC and
230 V AC, it is OK to use the same 24 V devices for all feeds.
4. Connect 0 V on the 24 V feed to the ground. This offers three advantages:
–Safety is increased. The 24 V feed will not be live in the event of a faulty connection or short circuit between 0 V (24 V) and 230 V phase.
–Transients on the 24 V feed are connected to the ground.
–No risk that the 24 V feed is at a high level in relationship to the ground. This is
not unusual since there is high static electricity.
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Additional Installation Tips
6.6 Galvanic Isolation
Internal electronic
Filter
Ethernet
DC/DC
galvanic isolation
DC/AC
VCC
+24 V DC
CFL
0 V (GND)
0V
1.5 m
RS422/485
RS232
USB
5356
USB
The operator panel 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.
Modular controller
Operator panel
Power CPU
RS422
PC
*
*
RS232
*
* * *
USB
Printer
COM COM2
*
*
PC
Not same ground potential
*
* = Internal 0 V (GND) connection
5357
When a PC is connected to the panel, the panel’s internal 0 V (GND) will be
connected to the protective ground via the PC.
A number of USB devices can have the shield connected together with the protective
ground. Here, the panel’s 0 V (GND) is connected to the 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 and a ground connection, and
these are connected to various grounding points, there is a substantial risk of
problems. Grounding currents go through communication cables, the rear plate of
the controller, and internally in the operator panel, and can cause errors.
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:
It is very important to make sure that the 24 V feed in the external insulation unit is
not connected to one of the communication outlets. If it does not have 100% insulation
against the 24 V feed, disturbances and grounding currents from the 0 V on the 24 V
side will disrupt communication.
Using this type of unit solves one problem but creates a larger problem!
A substandard installation may work now, but problems may arise when other devices
are connected.
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Beijer Electronics, MAEN992
Additional Installation Tips
6.7 Cable and Bus Termination RS485
– Use shielded and twisted pair cable.
The pair capacitance may not exceed 52.5 pF/m and area at least 0.25 mm2 (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 for 0 V.
– The shield must be grounded at one end. The other end is usually grounded, but
with longer distances or when there is a difference in the ground potential, the
shield should be connected to the ground via 0.1 uF/250 V plastic 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 systems for bus termination. The RS485
standard does not describe how the “Fail Safe” function would be carried out, just
that the system should be able to handle the error.
Depending on the recipients’ design, the bus wires may be on the same level or
require pull-up or pull-down to ensure that no faulty signals are detected when the
bus is in resting mode (all transmitters are disconnected).
Inside operator panel
+5 V
1
+5 V
2
3
1K
1K
120 ohm
120 ohm
1K
0V
(120 ohm)
1K
0V
0V
4
CAB8
Operator
panel
RS422
Bus
RS485
CAB8
0V
0V
VCC
+5 V
0V
0V
VCC
Shield
1K
2.65 V
2.35 V
120 ohm
1K
Bus termination
5358
1. Some (older) operator panels had pull-up and pull-down resistance except for
the actual bus termination at 120 ohm, similar to Westermo and Profibus.
2. Newer panels have another type of recipient, so-called built-in “Fail Safe”, where
simple bus termination resistance is sufficient.
If other nodes on the RS485 network require pull-up and pull-down and the
operator panel is at one end of the loop, one of the following procedures can be
carried out:
3. Connect two 1k/0.25 W resistors in the 25-pole D-sub contact. Set jumper pins
6-19.
4. Use CAB8. It offers the option of bus termination with pull-up/-down. It is also
easy to connect the bus cable via the screw terminal block.
Beijer Electronics, MAEN992
23
HEAD OFFICE
SUBSIDIARIES
SWEDEN
GERMANY
USA
Beijer Electronics Products AB
Box 426
SE-201 24 Malmö, Sweden
Tel: +46 40 35 86 00
Fax: +46 40 93 23 01
[email protected]
Elektronik-Systeme Lauer GmbH & Co. KG
Kelterstraße 59
72669 Unterensingen, GERMANY
Tel: +49 7022 9660 0
Fax: +49 7022 9660 103
[email protected]
Beijer Electronics Inc.
939 N. Plum Grove Road, Suite F
Schaumburg, IL 601 73, USA
Tel: +1 847 619 6068
Fax: +1 847 619 6674
[email protected]
TAIWAN
CHINA
Hitech Electronics Corp.
7 & 8 F, No. 108 Min-Quan Road
Shin-Tien, Taipei Shien, TAIWAN, R.O.C. 231
Tel: +886-2-2218-3600
Fax: +886-2-2218-9547
[email protected]
Beijer Electronics Co. Ltd
Room 201, Buildning B, No. 1618,
Yishan Road, Shanghai 201103, CHINA
Tel: +86 21 6145 0400
Fax: +86 21 6145 0499
[email protected]
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