Beckhoff KL8001 Operator's manual

Documentation
KL8001 and KL9060
Power terminal for Siemens contactors of the Sirius 3RT10
series
2.0.0
2017-09-15
Version:
Date:

Table of contents
KL8001 and KL9060 3Version: 2.0.0
Table of contents
1 Foreword ....................................................................................................................................................5
1.1 Notes on the documentation........................................................................................................... 5
1.2 Safety instructions .......................................................................................................................... 6
1.3 Documentation issue status............................................................................................................ 7
2 Product Overview ......................................................................................................................................9
2.1 KL8001 Power terminal - Introduction ............................................................................................ 9
2.2 KL8001 Power terminal - Functional description .......................................................................... 10
2.3 Power terminal KL8001 - Technical data...................................................................................... 12
2.4 KL9060 Adapter terminal - Introduction ........................................................................................ 13
2.5 Adapter terminal KL9060 - Technical data ................................................................................... 14
3 Mounting and wiring ...............................................................................................................................15
3.1 Installation on mounting rails ........................................................................................................ 15
3.2 Mounting the KL8001.................................................................................................................... 18
3.3 Connection.................................................................................................................................... 19
3.4 Application examples.................................................................................................................... 20
4 KS2000 Configuration Software.............................................................................................................22
4.1 KS2000 - Introduction ................................................................................................................... 22
4.2 Parameterization with KS2000 ..................................................................................................... 23
4.3 Settings......................................................................................................................................... 25
5 Access from the user program ..............................................................................................................28
5.1 Process image .............................................................................................................................. 28
5.1.1 Control and Status Bytes .................................................................................................28
5.1.2 Extended Control-Byte.....................................................................................................30
5.1.3 Extended Status-Byte ......................................................................................................31
5.2 Parameter registers (overview)..................................................................................................... 31
5.2.1 Parameter registers (description).....................................................................................33
5.2.2 Examples of Register Communication.............................................................................37
5.3 Data registers ............................................................................................................................... 41
5.3.1 Status word ......................................................................................................................42
6 TwinCAT ...................................................................................................................................................43
7 Appendix ..................................................................................................................................................45
7.1 Ordering information ..................................................................................................................... 45
7.2 Support and Service ..................................................................................................................... 46

Table of contents
KL8001 and KL90604 Version: 2.0.0

Foreword
KL8001 and KL9060 5Version: 2.0.0
1 Foreword
1.1 Notes on the documentation
Intended audience
This description is only intended for the use of trained specialists in control and automation engineering who
are familiar with the applicable national standards.
It is essential that the documentation and the following notes and explanations are followed when installing
and commissioning these components.
It is the duty of the technical personnel to use the documentation published at the respective time of each
installation and commissioning.
The responsible staff must ensure that the application or use of the products described satisfy all the
requirements for safety, including all the relevant laws, regulations, guidelines and standards.
Disclaimer
The documentation has been prepared with care. The products described are, however, constantly under
development.
We reserve the right to revise and change the documentation at any time and without prior announcement.
No claims for the modification of products that have already been supplied may be made on the basis of the
data, diagrams and descriptions in this documentation.
Trademarks
Beckhoff®, TwinCAT®, EtherCAT®, Safety over EtherCAT®, TwinSAFE®, XFC® and XTS® are registered
trademarks of and licensed by Beckhoff Automation GmbH.
Other designations used in this publication may be trademarks whose use by third parties for their own
purposes could violate the rights of the owners.
Patent Pending
The EtherCAT Technology is covered, including but not limited to the following patent applications and
patents: EP1590927, EP1789857, DE102004044764, DE102007017835 with corresponding applications or
registrations in various other countries.
The TwinCAT Technology is covered, including but not limited to the following patent applications and
patents: EP0851348, US6167425 with corresponding applications or registrations in various other countries.
EtherCAT® is registered trademark and patented technology, licensed by Beckhoff Automation GmbH,
Germany
Copyright
© Beckhoff Automation GmbH & Co. KG, Germany.
The reproduction, distribution and utilization of this document as well as the communication of its contents to
others without express authorization are prohibited.
Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a
patent, utility model or design.

Foreword
KL8001 and KL90606 Version: 2.0.0
1.2 Safety instructions
Safety regulations
Please note the following safety instructions and explanations!
Product-specific safety instructions can be found on following pages or in the areas mounting, wiring,
commissioning etc.
Exclusion of liability
All the components are supplied in particular hardware and software configurations appropriate for the
application. Modifications to hardware or software configurations other than those described in the
documentation are not permitted, and nullify the liability of Beckhoff Automation GmbH & Co. KG.
Personnel qualification
This description is only intended for trained specialists in control, automation and drive engineering who are
familiar with the applicable national standards.
Description of symbols
In this documentation the following symbols are used with an accompanying safety instruction or note. The
safety instructions must be read carefully and followed without fail!
DANGER
Serious risk of injury!
Failure to follow the safety instructions associated with this symbol directly endangers the
life and health of persons.
WARNING
Risk of injury!
Failure to follow the safety instructions associated with this symbol endangers the life and
health of persons.
CAUTION
Personal injuries!
Failure to follow the safety instructions associated with this symbol can lead to injuries to
persons.
Attention
Damage to the environment or devices
Failure to follow the instructions associated with this symbol can lead to damage to the en-
vironment or equipment.
Note
Tip or pointer
This symbol indicates information that contributes to better understanding.

Foreword
KL8001 and KL9060 7Version: 2.0.0
1.3 Documentation issue status
Version Comment
2.0.0 • Migration
• Chapter Mounting rail installation revised
• Structural update
1.2.0 • Introduction and annex updated
• Ordering information updated
• Technical data updated
• Description of feature register updated
• Description of command register added
• Parameter registers PR33, PR40, PR46: resolution corrected
• Description of the Data registers corrected
1.1 • Technical data updated
• Description of the parameter registers extended
1.0 • Description of the parameter registers updated
• English version available
0.3 • Product overview revised
• Description of control and status byte revised
• Register description revised
• Ordering information extended
0.2 • Functional description revised
• Technical data updated
• Information about mounting and wiring added
• Application examples added
• Description of parameterization with KS2000 software added
• Description of the process image revised
• Register description amended
• Ordering information added
0.1 • First preliminary version
Firmware and hardware versions
Documentation
Version
KL8001 KL9060
Measuring PCB K-bus PCB Firmware Hardware
Firmware Hardware Firmware Hardware
2.0.0 5 (=3C) 5 7 (=3D) 4 00 02
1.2.0 5 (=3C) 4 6 (=3C) 1 00 01
1.1 2 (=2A) 3 3 (=1C) 0 00 00
1.0 1 (=1B) 1 1 (=1B) 0 00 00
0.3 00 00
0.2 00 00
0.1 00 00
• The firmware and hardware versions (delivery state) of the KL9060 can be found in the serial number printed at the side of the
terminal.
• The firmware version of the measuring PCB of the KL8001 can be read from data register DR37 [}41].
• The firmware version of the K-bus PCB of the KL8001 is shown in the header of the KS2000 Settings [}25] dialog for KL8001
• The hardware version of the measuring and K-bus PCB of the KL8001 is coded in the serial number of the KL8001.
Syntax of the serial number for KL9060
Structure of the serial number: KKYYFFHH

Foreword
KL8001 and KL90608 Version: 2.0.0
KK - week of production (CW, calendar week)
YY - year of production
FF - firmware version
HH - hardware version
Example with ser. No.: 02 06 00 01:
02 - week of production 02
06 - year of production 2006
00 - firmware version 00
01 - hardware version 01
Syntax of the serial number for KL8001
Structure of the serial number: KKYYFHfh
KK - week of production (CW, calendar week)
YY - year of production
FH - firmware version (F) and hardware version (H) of the measuring PCB (coded)
fh - firmware version (f) and hardware version (h) of the K-bus PCB (coded)
Example with ser. No.: 02 06 54 61:
02 - week of production 02
06 - year of production 2006
54 - measuring PCB: firmware version 5 (=3C), hardware version 4
61 - K-bus PCB: firmware version 6 (=3C), hardware version 1

Product Overview
KL8001 and KL9060 9Version: 2.0.0
2 Product Overview
2.1 KL8001 Power terminal - Introduction
The KL8001 power terminal is specially constructed for Siemens contactors [}45] from the Sirius 3RT10
series, size S00. It is fitted to the contactor in the same way as a standard motor protection relay. The power
terminal switches the installed contactor and takes over all the functions of the motor protection relay. Apart
from its purely protective function of switching off the motor when overloaded, the power terminal can carry
out numerous diagnostic functions on the motor and make the diagnostic data available to the controller via
the fieldbus.
Fig.1: KL8001
Name Description
K-Bus In Pin contact strip for the incoming K-bus.
K-Bus Out Pin contact strip for the outgoing K-bus. Insert the bus end plug [}19] here, included with
the KL9060, in the last power terminal of your bus terminal block.
L1, L2, L3 Connection terminals for the load circuit from the mains.
L1', L2', L3' Connection pins for the load circuit to the contactor.
13, 13' Connections for feeding through the auxiliary contact.
Out1 Connection pin for the contactor's operating coil (right motion in reversing contactor
connection)
Out2 Connection terminal for the contactor's operating coil (left motion in reversing contactor
connection)
1A Rotary switch for manual adjustment of the rated current (resolution 1A)
0.1A Rotary switch for manual adjustment of the rated current (resolution 0.1 A)
on (motor) LED for motor diagnostics: indicates whether the motor is switched on
overload
(motor)
LED for motor diagnostics: indicates motor overload
run (fieldbus) LED for K-bus diagnostics: indicates that data is being transferred on the K-bus
stop (fieldbus) LED for K-bus diagnostics: indicates that data transmission on the K-bus has been
interrupted
Lugs Lugs for mounting the KL8001 on Siemens contactors

Product Overview
KL8001 and KL906010 Version: 2.0.0
2.2 KL8001 Power terminal - Functional description
Rotary switches for adjusting the rated current
You can set the motor's rated current manually using the two rotary switches on the power terminal. The
upper rotary switch operates in 1A steps, while the lower switch provides 0.1A steps. You can thus set
values between 0.9A and 9.9A. The value set then applies to all three phases.
If you set the two rotary switches to zero, you must specify the rated motor current using the three parameter
registers PR33 [}34], PR39 [}34] and PR45 [}34]. You can then:
• set the rated current separately for each phase, if three different single-phase motors are connected,
for example.
• use the extended setting range of 10.0A to 15.0A, which cannot be set via the rotary switches.
Fig.2: KL8001 - rotary switch for setting the rated current
LEDs
Fig.3: KL8001 - LEDs
The power terminal has 4 LEDs for status display to enable rapid diagnosis. The possible states are listed in
the following table.
LED State Description
on (motor) on Motor is running, either to the right or left
off Motor is switched off, or overload protection has triggered
overload (motor) on Motor has been switched off due to overload
flashes (2Hz) Power has fallen below minimum load threshold
flashes (5Hz) Overload threshold has been exceeded
off Nominal operation (load neither below minimum and or above maximum), or motor is
switched off
run (fieldbus) on Communication with the terminal bus is taking place without errors
off No communication with the terminal bus (watchdog timer has triggered after 100ms)
stop (fieldbus) on No communication with the terminal bus
flashes Error code and error argument are indicated as flashing code
off Communication with the terminal bus is taking place without errors

Product Overview
KL8001 and KL9060 11Version: 2.0.0
Flashing Code
If there is a fieldbus error, the stop LED indicates a flashing code that describes the fault more accurately:
The LED flickers for about 2seconds before starting the error output. After a clearly visible pause, the error
code is indicated through slow flashing, and the error argument is then indicated after a further pause. The
following table allows you to determine the error more precisely with the aid of these two items of
information.
Code Argument Description Solution
1 0 No rated current set: both the two rotary switches and
• the register PR33 are zero (single-phase analysis
[}26] not active) or
• at least one of registers PR33, PR39 or PR45 is
zero (single-phase analysis is active)
• Use the rotary switches [}10] to set a rated
current, or
• enter values for the rated current in
registers PR33 [}34], PR39 [}34] and
PR45 [}34].
2 n Communication with the nth ADC is faulty Contact your supplier.
3 n Communication with the nth Hall sensor is faulty
Note
Changing the terminal registers
üTo ensure that the new values are applied to the measuring unit after the terminal regis-
ters have been changed, you have to perform:
a) a power-off reset (switch the terminal off and back on again) or
b) a software reset [}33] (via the command register)!

Product Overview
KL8001 and KL906012 Version: 2.0.0
2.3 Power terminal KL8001 - Technical data
KL8001 Power Terminal
Number of power terminals per Bus Coupler 10 max. If you operate two contactors with each power terminal (reversing
contactor connection) then you may only use 5 power terminals with
each Bus Coupler.
Observe also the maximum current [}14] that your Bus Coupler can
supply to the K-bus!
Number of contactors per Bus Coupler 10 max.
Type of fastening and mechanical connec-
tion
Suitable for Siemens contactors of the Sirius 3RT10 series, size S00
Type of connection power path Screw terminals for core cross-sections up to 2 x 2.5mm2
Power path current loading (back-up fuse) 25A max.
Power path short-circuit strength up to 5000A
Power path internal resistance < 1mΩ
Setting range of rated current via rotary switch [}10]: 0.9A to 9.9A
via KS2000 [}27] or parameter registers [}34]: 0.9A to 15.0A
Selectable tripping classes CLASS 5, 10, 15, 20, 25, 30 selectable
Measured values Current, voltage, effective power, cos j, energy consumption, switching cycles, operating
hours
Measuring accuracy (at balanced load) 0.15Arms; 2Vrms; 5W; 1kWh
Crosstalk between the channels at unbal-
anced load
up to 3% from the difference
Measuring voltage 500V
Type of K-bus connection 2 x flat plug socket, 10 pin
K-bus current consumption (5VDC) typically 150mA
Observe the maximum current [}14] that your Bus Coupler can supply to the K-bus!
Contactor control voltage current consump-
tion (24VDC)
When contactor switched off: typically 7mA
When contactor switched on: typically 7mA + current in the contactor coil
Dielectric strength 500V (power contact/K-bus), 6000V(mains supply/K-bus)
Behavior under short-circuit conditions conforms to EN 60947-4-1 (assignment type 2)/VDE 102
Triggering tolerance conforms to IEC 947, as well as UL and CSA
Configuration options Automatic over the fieldbus using the KS2000 configuration software, manual (rated cur-
rent)
Width in the process image 96 bits I/O (see description of the process image [}28])
Permissible ambient temperature range dur-
ing operation
0°C ... +55°C
Permissible ambient temperature range dur-
ing storage
-25°C ... +85°C
Permissible relative air humidity 95%, no condensation
Vibration/ shock resistance conforms to EN60068-2-6/ EN60068-2-27
EMC immunity/ emission conforms to EN61000-6-2 / EN61000-6-4
Weight approx. 90g
Dimensions (W x H x D) approx. 45mmx69mmx74mm
Mounting With lugs and connecting pins to Siemens contactors of the 3RT1016 series
Installation position variable (although you must observe the permitted installation positions of the contactors)
Protection class IP20
Approvals CE

Product Overview
KL8001 and KL9060 13Version: 2.0.0
2.4 KL9060 Adapter terminal - Introduction
The KL9060 Adapter Terminal is used to connect power terminals to the K-bus of the Beckhoff bus terminal
system.
Fig.4: KL9060
Name Description
K-bus Out Pin contact strip for the outgoing K-bus. Plug the long ribbon cable (approx. 10cm) in
here to the first power terminal.
ZS1010-1610 Insert the ZS1010-1610 bus end plug into the K-bus Out pin contact strip on the last
power terminal [}19].
2 and 6 Terminals for the connection of the power contact's +24V
3 and 7 Terminals for the connection of the power contact's 0V
4 and 8 Terminals for the connection to the power contact's PE
+24VPPower contact for +24V
0VPPower contact for 0V
PEPPower contact for PE

Product Overview
KL8001 and KL906014 Version: 2.0.0
2.5 Adapter terminal KL9060 - Technical data
KL9060 Adapter terminal
Power contacts voltage (ribbon cable) 24VDC (-15%, +20%)
Power contacts current loading (ribbon
cable)
maximum 1400mA (short-circuit proof).
Observe the current consumption of the power terminals and the
contactor coils!
Voltage of the K-bus power supply (ribbon
cable)
5VDC
Current consumption of the K-bus power
supply (ribbon cable)
maximum 2000mA
Observe the maximum current that your Bus Coupler can supply
to the K-bus! Examples:
• Low Cost Coupler: 500mA
• Economy Coupler: 500mA
• Economy Plus Coupler: 1750mA
• Standard Coupler: 1750mA
• KL9400 Power Supply Terminal: 2000mA
Use the KL9400 Power Supply Terminal if the current
consumption of your terminals exceeds the maximum current
that your Bus Coupler can feed to the K-bus supply.
Number of power terminals per KL9060 10 max. If you operate two contactors with each power
terminal (reversing contactor connection) then you
may only use 5 power terminals with each KL9060.
Observe also the maximum current [}14]that your
Bus Coupler can supply to the K-bus!
Number of contactors per KL9060 10 max.
Permissible ambient temperature range
during operation
0°C ... +55°C
Permissible ambient temperature range
during storage
-25°C ... +85°C
Permissible relative air humidity 95%, no condensation
Vibration/ shock resistance conforms to EN60068-2-6/ EN60068-2-27
EMC immunity/ emission conforms to EN61000-6-2 / EN61000-6-4
Weight approx. 50g
Dimensions (W x H x D) approx. 33mmx100mmx70mm
Mounting on 35mm mounting rail conforms to EN60715
Installation position variable
Protection class IP20
Approvals CE

Mounting and wiring
KL8001 and KL9060 15Version: 2.0.0
3 Mounting and wiring
3.1 Installation on mounting rails
WARNING
Risk of electric shock and damage of device!
Bring the bus terminal system into a safe, powered down state before starting installation,
disassembly or wiring of the Bus Terminals!
Assembly
Fig.5: Attaching on mounting rail
The Bus Coupler and Bus Terminals are attached to commercially available 35mm mounting rails (DIN rails
according to EN60715) by applying slight pressure:
1. First attach the Fieldbus Coupler to the mounting rail.
2. The Bus Terminals are now attached on the right-hand side of the Fieldbus Coupler. Join the compo-
nents with tongue and groove and push the terminals against the mounting rail, until the lock clicks
onto the mounting rail.
If the Terminals are clipped onto the mounting rail first and then pushed together without tongue and
groove, the connection will not be operational! When correctly assembled, no significant gap should
be visible between the housings.
Note
Fixing of mounting rails
The locking mechanism of the terminals and couplers extends to the profile of the mounting
rail. At the installation, the locking mechanism of the components must not come into con-
flict with the fixing bolts of the mounting rail. To mount the mounting rails with a height of
7.5mm under the terminals and couplers, you should use flat mounting connections (e.g.
countersunk screws or blind rivets).

Mounting and wiring
KL8001 and KL906016 Version: 2.0.0
Disassembly
Fig.6: Disassembling of terminal
Each terminal is secured by a lock on the mounting rail, which must be released for disassembly:
1. Pull the terminal by its orange-colored lugs approximately 1cm away from the mounting rail. In doing
so for this terminal the mounting rail lock is released automatically and you can pull the terminal out of
the bus terminal block easily without excessive force.
2. Grasp the released terminal with thumb and index finger simultaneous at the upper and lower grooved
housing surfaces and pull the terminal out of the bus terminal block.
Connections within a bus terminal block
The electric connections between the Bus Coupler and the Bus Terminals are automatically realized by
joining the components:
• The six spring contacts of the K-Bus/E-Bus deal with the transfer of the data and the supply of the Bus
Terminal electronics.
• The power contacts deal with the supply for the field electronics and thus represent a supply rail within
the bus terminal block. The power contacts are supplied via terminals on the Bus Coupler (up to 24V)
or for higher voltages via power feed terminals.
Note
Power Contacts
During the design of a bus terminal block, the pin assignment of the individual Bus Termi-
nals must be taken account of, since some types (e.g. analog Bus Terminals or digital 4-
channel Bus Terminals) do not or not fully loop through the power contacts. Power Feed
Terminals (KL91xx, KL92xx or EL91xx, EL92xx) interrupt the power contacts and thus rep-
resent the start of a new supply rail.
PE power contact
The power contact labeled PE can be used as a protective earth. For safety reasons this contact mates first
when plugging together, and can ground short-circuit currents of up to 125A.

Mounting and wiring
KL8001 and KL9060 17Version: 2.0.0
Fig.7: Power contact on left side
Attention
Possible damage of the device
Note that, for reasons of electromagnetic compatibility, the PE contacts are capacitatively
coupled to the mounting rail. This may lead to incorrect results during insulation testing or
to damage on the terminal (e.g. disruptive discharge to the PE line during insulation testing
of a consumer with a nominal voltage of 230V). For insulation testing, disconnect the PE
supply line at the Bus Coupler or the Power Feed Terminal! In order to decouple further
feed points for testing, these Power Feed Terminals can be released and pulled at least
10mm from the group of terminals.
WARNING
Risk of electric shock!
The PE power contact must not be used for other potentials!

Mounting and wiring
KL8001 and KL906018 Version: 2.0.0
3.2 Mounting the KL8001
Preparation for mounting
1. Undo all 5 screw terminals (1L1, 3L2, 5L3, 13NO, A1+) on the mains connection side of the Siemens
contactor.
2. Suspend the power terminal by inserting the two lugs into the two rectangular openings at the foot of
the Siemens contactor.
3. Push the power terminal's 5 contact pins into the 5 opened screw terminals on the mains connection
side of the Siemens contactor until the power terminal is located flush with the Siemens contactor. The
power terminal's two lugs must not be allowed to slip out of the rectangular holes at the foot of the
Siemens contactor!
4. Firmly tighten all 5 screw terminals on the mains side of the Siemens contactor. The power terminal
must sit tightly, flush with the Siemens contactor!
Attention
Intended use
Only use the KL8001 Power Terminal in combination with Siemens contactors of the SIR-
IUS 3RT10 series, size S00, as listed in the ordering information [}45]!
Installing a Bus Terminal block with power terminals
When mounting, observe the information in the chapter entitled Mounting rail installation [}15].
1. Ensure that the system is powered down and in a safe state.
2. Install the Bus Terminal block, consisting of the fieldbus coupler and any Bus Terminals that may be
desired, on a mounting rail.
Fit a KL9060 Adapter Terminal as the last Bus Terminal at the end of the Bus Terminal block instead
of a standard end terminal (KL9010).
3. Clip the Siemens contactor, with the power terminal mounted on it, about 3cm away on the mounting
rail next to the KL9060 Adapter Terminal.
4. Use the ribbon cable, about 10cm long, included with the KL9060 Adapter Terminal, to join the power
terminal to the KL9060.
5. Connect the power terminal to the next power terminal, using the ribbon cable (approx. 3cm long)
supplied with the power terminal.
or
connect the terminal connector supplied with the KL9060 Adapter Terminal to the continuation plug
connector of the last power terminal.
Up to 10 type KL8001 Power Terminals can be operated from one Bus Terminal block.

Mounting and wiring
KL8001 and KL9060 19Version: 2.0.0
3.3 Connection
WARNING
Risk of electric shock and damage of device!
Bring the bus terminal system into a safe, powered down state before starting installation,
disassembly or wiring of the Bus Terminals!
The first power terminal is connected to the end of the Bus Terminal block with the KL9060 [}13] Adapter
Terminal.The K-bus, and the contactor control voltage (24V) are brought from the KL9060 to the first power
terminal via a ribbon cable about 10cm in length. Other power terminals are connected using a ribbon cable
about 3cm. Insert the ZS1010-1610 bus end plug included with the KL9060 into the last power terminal!
Fig.8: KL8001, KL9060 - Connection
Power is supplied to the KL8001 electronics via the K-bus (through the ribbon cable).
The (24V) contactor control voltage that is to be switched by the power terminals is also passed along the
ribbon cable, but is electrically isolated from the K-bus. You may simply join the ground connection for the
contactor coils (A2-) with the free ground terminals (0V, contacts 3 and 7) on the KL9060 [}13] Adapter
Terminal.
Attention
Rated current inadmissibly exceeded
The KL9060 Adapter Terminal can supply up to 1.4A rated current to power the contactor
coils (24VDC). Make sure that this rated current is not exceeded.

Mounting and wiring
KL8001 and KL906020 Version: 2.0.0
3.4 Application examples
WARNING
Protection of the load circuit
Ensure that the load circuit can be fused with up to a maximum of 25A per phase.
Motor control
The following figure illustrates control of a three-phase AC motor utilizing a KL8001 and a Siemens
contactor. The power terminal's Out1 output controls the Siemens contactor.
Fig.9: Application example: Motor control
Reversing contactor connection
The following figure illustrates a reversing contactor connection utilizing a KL8001 and two Siemens
contactors. The power terminal's Out1 and Out2 outputs alternately control the two Siemens contactors.