gtm ILA User manual

Operating manual
In-line measuring amplifier ILA
Power injector PWIN

GTM Testing and Metrology GmbH
Philipp-Reis-Straße 4-6
64404 Bickenbach
Germany
Tel. [phone]
Fax [phone]
[email protected]
www.gtm-gmbh.com
EGTM Testing and Metrology GmbH
All rights reserved. This document may not be photocopied, duplicated in any other form or
translated into another language either in whole or in part without the prior written consent of
GTM.
The content of these instructions is intended solely for information purposes and can be
changed at any time without prior notification.
With regard to the warranty and liability, we refer expressly to our 'General commercial terms
and conditions' (www.gtm-gmbh.com) and the instructions and regulations contained in these
installation and operating instructions.

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1 Safety instructions 5..........................................
2 Markings used 8..............................................
2.1 Markings used in these instructions 8.............................
2.2 Symbols attached to the device 8................................
3 In-line measuring amplifier ILA 9...............................
3.1 Product description 9..........................................
3.2 Installation/connection 9.......................................
3.2.1 M12 sensor connection 11.................................
3.2.2 Voltage supply and EtherCAT® connections 12................
3.2.3 Operation of several in-line measuring amplifiers (ILA) 13.......
3.2.4 Shielding and grounding concept 15........................
3.3 Functions 15..................................................
3.3.1 Measurement value output 15.............................
3.3.2 Filter settings 15........................................
3.4 EtherCAT® 16..................................................
3.4.1 PDO index 0x1A01 DI: 16..................................
3.4.2 PDO index 0x1A20 AI: 17..................................
3.4.3 PDO index 0x1A30 AI: 17..................................
3.4.4 SDO overview 18........................................
3.4.5 Distributed Clocks 22.....................................
3.5 Dimensions 24.................................................
3.6 Technical data 26..............................................
3.7 Maintenance 26...............................................
3.8 Cleaning 26...................................................
3.9 Accessories 26.................................................

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4 GTM power injector (PWIN) 28...................................
4.1 Product description 28..........................................
4.2 Installation/connection 28.......................................
4.3 Dimensions 30.................................................
4.4 Technical data 30..............................................
5 Disposal 31...................................................
6 Technical support 32..........................................
7 Declaration of conformity 32....................................

Safety instructions
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1 Safety instructions
Additional regulations
These operating instructions contain the most important notes for operating the
in-line measuring amplifier (ILA) and the industrial power injector (GTM-PWIN)
safely. Consideration must also be given to the legal and safety regulations
applicable at the operating location, the accident prevention regulations
applicable at the operating location and the technical data in connection with the
safety regulations listed here.
Particular hazards
DANGER
Fatal hazard due to electrical current!
The devices are operated with electrical current; there is therefore
always a risk of an electric shock.
Therefore: keep the devices away from rain, moisture and heat
sources.
DANGER
Damage to the device due to an incorrect power supply!
An incorrect power supply can lead to damage at the industrial
power injector (GTM-PWIN).
Therefore: use the industrial power injector (GTM-PWIN) exclusively
with power supplies, that comply with the technical specifications.
DANGER
Damage to the device due to an incorrect power supply.
The in-line measuring amplifier (ILA) is supplied exclusively via Power
over Ethernet (passive).
Therefore: use the ILA exclusively with the GTM power injector
(PWIN) or another industrial, passive power injector that complies
with the technical specifications.

Safety instructions
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Residual hazards
The measuring amplifier (ILA) and the power injector (PWIN) are state-of-the-art
and safe to operate. Residual hazards can arise during operation if the devices are
used and operated improperly by unqualified personnel.
The scope of supply of the measuring amplifier (ILA) and the power injector (PWIN)
only covers a partial area of mechatronic metrology. The safety aspects when
using the in-line measuring amplifier (ILA) and the power injector (PWIN) in an
overall system must be taken into consideration by the system designer, the
outfitter and/or the operator so that residual hazards are minimised. The residual
hazards remaining in the overall system must be pointed out.
Condition and changes
The in-line measuring amplifier (ILA) and the power injector (PWIN) may only be
operated in flawless condition subject to compliance with the notes described in
the operating instructions. Neither the design nor the safety technology of the
devices may be modified.
Personnel qualifications
The in-line measuring amplifier (ILA) and the power injector (PWIN) must only be
installed and operated by qualified personnel.
Qualified personnel refers to persons who are familiar with the installation,
commissioning and operation of the devices and who have qualifications
corresponding to their work.
Ambient conditions
The in-line measuring amplifier (ILA) and the power injector (PWIN) are intended
for use in industrial applications subject to adherence to the ambient conditions
specified in the technical data.
Protect the devices from the effects of weather such as rain and snow.
Implement suitable measures on site to protect against overvoltage, e.g. due to
lightning strikes.

Safety instructions
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Storage and transport instructions
The in-line measuring amplifier (ILA) is a precision measuring instrument that must
accordingly be handled with care.
Dropping and shocks can cause damage to the measuring amplifier, therefore
prohibiting its continued use.
Use the original transport packaging or other suitable custom packaging for
storage and transport.
Excepted use
Any use of the in-line measuring amplifier (ILA) and the power injector (PWIN) that
exceeds the scope of proper use and/or any alternative use can lead to hazardous
situations.
The devices are not safety elements. They may not be used in an overall system if
their failure can lead to the endangerment of persons.
The devices may not be used in the context of legal metrology.
The devices are not suitable or approved for use in potentially explosive
atmospheres.

Markings used
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2 Markings used
2.1 Markings used in these instructions
Important safety notices are particularly marked. Please observe these notices
under all circumstances in order to avoid accidents and property damage.
DANGER
Denotes a possibly hazardous situation that can lead to physical
injuries or death.
DANGER
Denotes a hazardous situation due to electrical voltage that can lead
to physical injuries or death.
NOTE
Denotes usage tips, general information and other useful notes.
▶
Denotes handling instructions
SDenotes lists
2.2 Symbols attached to the device
CE label
With the CE label, the manufacturer guarantees that its product meets
the requirements of the relevant EU directives (the declaration of
conformity can be found at the end of this documentation and on the
GTM website (www.gtm-gmbh.com)
Legally specified disposal marking
Old devices that are no longer usable must be disposed of separately
from household waste as per the national and local environmental
protection and raw material recycling regulations.

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3 In-line measuring amplifier ILA
3.1 Product description
The in-line measuring amplifier ILA is a high-performance, single-channel strain
gauge full bridge measuring amplifier. Strain gauge-based transducers and sensors
such as e.g. force and torque transducers, load cells [kg or N], etc. can be
connected to the ILA on the sensor side.
The ILA is configured entirely via the EtherCAT® interface1) in the application
control system. The corresponding device description file ESI (EtherCAT Slave
Information) is made available for system integration. The ESI is available for
downloading from the ILA product page. www.gtm-gmbh.com/produkte/dms-
messverstaerker/messverstaerker-serie-ila
Voltage is supplied via passive Power over Ethernet and RJ45 network cables. The
GTM power injector ILA-PWIN or other suitable passive power injectors are
required for this.
Depending on application or the number of channels, several ILAs can be
connected in a line using a daisy chain. The voltage is always supplied via the
industrial GTM power injector or other suitable passive power injectors.
Scope of supply
SIn-line measuring amplifier ILA
S1 protection cap M12 for sensor connection
S2 protection caps for RJ45 connections
SQuick guide
SSafety notices
3.2 Installation/connection
The in-line measuring amplifier (ILA) is essentially suitable for sensor-near
operation and can be installed flexibly in all directions in your application (subject
to adherence to technical specifications). Depending on the layout of your
application, the following installation types can prove sensible:
1) EtherCAT® is a registered trademark and patented technology licensed by Beckhoff Automation GmbH,
Germany.

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SThe ILA is fastened in the housing of your application using the four fastening
holes (through holes).
SIn applications involving multiple channels, the ILAs can be coupled together
using connectors on the lower side. Additionally fastening the ILAs to one
another using M4x60 screws (e.g. Allen or other screws) is recommended. This
configuration may be sensible depending on application. Check whether and
how the lowest ILA is fastened using the M3 hole on the lower side if necessary.
SThe ILA has an M3 hole on the lower side of the housing. This hole can be used
e.g. to fasten a DIN rail mounting clip (e.g. Farnell DNC-4796). This enables the
ILA to be mounted easily and flexibly on classic top-hat rails.
NOTE
In your layout, make sure that the ILA is installed so that the
technical specifications for connectors and connecting cables are
adhered to, particularly in the event of operation in harsh ambient
conditions. E.g. no standing fluids on the connection sockets, etc.
Connections
The ILA has a total of three connections:
SOne M12 connection for the strain gauge transducer (see Tab. 3.1, Page 11)
STwo RJ45 connections that carry both the EtherCAT® signal from your control
system and the supply via Power over Ethernet (PoE) (see Tab. 3.2, Page 12)
- IN: input (control system and supply), on use with one in-line measuring
amplifier
- OUT: output (via integrated switch), on application with several ILAs in a line
structure.
Pin assignment of both connection sockets, see Chapter 3.2.2.

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3.2.1 M12 sensor connection
Pluggable cable connection
M12, A-coded, 8-pin connector
Connection Contact
Supply voltage (+) Uin+ 7
Supply voltage (-) Uin- 6
Measurement signal (+) Uout+ 1
Measurement signal (-) Uout- 8
Sensor signal (+) Sense+ 3
Sensor signal (-) Sense- 5
Shielding Housing
Tab. 3.1 Sensor connection
IMPORTANT
You can connect strain gauge sensors in a 6-conductor circuit with a
resistance of between 80 and 5,000 Ω. If you connect a transducer in
a 4-conductor circuit, 'sensor signal +' must always be connected to
'supply voltage +' and 'sensor signal –' to 'supply voltage –', e.g. using
jumpers in the connector.
IMPORTANT
Ensure the correct pin assignment for connecting the transducer as
per the specifications.
In order to adhere to the specified protection type, the appropriate Phoenix
Contact connectors type SACC-M12MS-8Q SH; M12, A-coded, 8-pin, straight or
angled, are recommended as mating connectors and are available as separate
accessories. GTM measuring cables are also available with the Phoenix Contact
connector.
Other commercially available M12 connectors can also be used. Make sure that the
necessary protection type is guaranteed depending on the application.

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NOTE
The maximum cable length from the transducer to the ILA is
10 meters.
3.2.2 Voltage supply and EtherCAT® connections
To connect the control system and the voltage supply to a connecting cable via
passive Power over Ethernet, the ILA is equipped with two 8-pin RJ45 connection
sockets (IN and OUT). In applications with one ILA, only the IN connection socket is
required for the EtherCAT® signal and the supply (the OUT socket should be sealed
with the enclosed protection cap if necessary). The ILA is also equipped with an
integrated switch via which several ILAs can be connected to one another using a
daisy chain (each via the OUT RJ45 connection socket).
Please note Chapter 3.2.3 'Operation of several in-line measuring amplifiers (ILA)'.
Pluggable cable connection
8-pin RJ45 connector
Connection Contact EtherCAT® signal ILA supply
Transmission (+) TX_P 1 X
Transmission (-) TX_N 2 X
Reception (+) RX_P 3 X
Power over Ethernet (PoE) (+) DC+ 4 X
Power over Ethernet (PoE) (+) DC+ 5 X
Reception (-) RX_N 6 X
Power over Ethernet (PoE) (-) DC- 7 X
Power over Ethernet (PoE) (-) DC- 8 X
Tab. 3.2 Connection to EtherCAT® and voltage supply via RJ45
IMPORTANT
Ensure the correct pin assignment for the data and the PoE supply as
per the specifications. You can operate the ILA using all commercially
available RJ45 connecting cables CAT5 (and higher).

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The ILA is equipped with two HARTING PushPullV4 type RJ45 connection sockets
with integrated anti-rotation lock, which locks the PushPull locking element in
plugged condition and secures it against unintentional disconnection for increased
process reliability.
SThe appropriate HARTING PushPull V4 plug type connectors, RJ45, cat. 6A, IDC
with insulation displacement connection technology are recommended as
mating connectors and are available as accessories.
SStandard RJ45 connectors can also be used but are not secured against
disconnection. Make sure that the standard RJ45 connectors are secured
against disconnection.
SIn the case of 1-channel applications, make sure that the ILA_OUT connection
socket is properly sealed with the enclosed protection cap.
Status LEDs
LED status L/A (IN+OUT) RUN Sensor
Off No connection to the
previous/following device
(ILA)
Device is in INIT
condition
No transducer detected
Always on Connected, no activity Device is in OP
condition
Transducer is connected
Very fast
flashing
Connection present, link
activity present
- -
Flashes 2x per
second
-Device is in
PREOP
condition
-
Flashes more
than 1x per
second
-Device is in
SAFEOP
condition
Error in the bridge supply.
Bridge supply not to
specification or only one cable
connected
3.2.3 Operation of several in-line measuring amplifiers (ILA)
You can operate several in-line measuring amplifiers (ILA) with one control system
at the same time. Up to 12 measuring amplifiers in one line are possible.
The following figure shows an example of a system topology with a control system
and a power injector in which four ILAs are connected to one another using a daisy
chain.

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CAT5 (and upwards) - EtherCAT® + supply; 8-wire, FTP/S-FTP cable
Strain gauge based
force transducer
(sensor) | load cell |
torque transducer
3rd party
Sensor max. 10 m Sensor max. 10 m Sensor max. 10 m
Series DR Series K Series RF
GTM ILA-PWIN
ILA-PWIN power
supply: 24-48 VDC
power supply
+ signal
only signal
Earth
Control system
The maximum number of ILAs depends on the voltage supply of the power injector
and the cable lengths (device-to-device and total length in a strand).
The following example of a schematic diagram shows a power injector that is
supplied with 48 VDC. Up to seven ILAs can be connected to one another over a
total of 350 metres in this set-up.
Control system
ILA-PWIN power
supply: 48 VDC
The cable length refers to the CAT5 (and upwards) lines (EtherCAT® + supply) after the power injector (PWIN_OUT)
Please observe the following boundary conditions in the layout of your application
and make sure that the GTM power injector is connected and supplied correctly.
Power injector (PWIN)
voltage supply
Cable length between ILAs (m) /
total cable length (m) 1)
Number of ILAs in a line
24 VDC 1 / 7 7
24 VDC 50 / 150 3
48 VDC 1 / 12 12
48 VDC 50 / 350 7
1) Strand thickness: AWG24; 0.5 mm2

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NOTE
The above table applies when the ILAs consume the typical current
specified in the technical data of the data sheet. The maximum
number of devices on a single power injector can change if the
devices consume more or less current (primarily dependent on the
sensor operating rate and the power supply load). Take this into
account when planning your application.
3.2.4 Shielding and grounding concept
The sensor signal and communication cables must be installed so that
electromagnetic interference does not affect the device functions. Suitable cables
must therefore be used to connect the sensor signal and communication cables.
Disturbances on the shielding must be conducted away in a controlled manner to
earth and outside of the device.
On use of a shielded cable, the shielding is routed via the device's connector. This
means that your system is shielded.
3.3 Functions
3.3.1 Measurement value output
In-line measuring amplifier (ILA) measurement value output is carried out in mV/V
using the PDO index 0x1A20 AI (one measurement value per frame) or 0x1A30 AI
(oversampling = 10 measurement values per frame)
3.3.2 Filter settings
Three low-pass filter settings are available. Adjustments can be carried out in the
CoE 8020:08 low-pass filter.
SFilter 1 [default]
FIR filter with Butterworth-like behaviour and a -3dB bandwidth of 0.45*fs
SFilter 2
Blackmann-Harris filter with a -3dB bandwidth of 0.1*fs. Recommended when
an optimised transient response is required.

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SOff
The output signal is not alias-free.
3.4 EtherCAT®
The in-line measuring amplifier (ILA) with EtherCAT® interface uses the EtherCAT®
CoE (CAN over EtherCAT®) technology for data transfer. There are two different
types of data objects that are transferred with each cycle (PDO – process data
objects) and data that are only transferred as required (SDO – service data
objects).
After successful integration of the in-line measuring amplifier (ILA) via the ESI file,
the EtherCAT® control system software (e.g. Beckhoff TwinCAT) automatically
applies the following settings:
SCurrent measurement value in mV/V (PDO index 0x1A20 AI)
SSample rate: 1,000 S/s (CoE 8020:01 ADC sample rate)
SFilter setting: 1 (CoE 8020:08 low-pass filter)
SNo oversampling
SDistributed clocks (activated)
Further settings can be carried out via the control system software (in
configuration mode).
The PDOs and SDOs of relevance to the user are described in the following.
3.4.1 PDO index 0x1A01 DI:
Name: DI
PDO index: x6000
Subindex: 1
Name: frame counter
Description: incremented by one for each EtherCAT® frame received. Can be used
as an indicator of whether the frames are received by the device, e.g. with short
cycle times.
Index (hex) Name Meaning Data type Flags Size
0x6000:01 Frame counter Incremented in each EtherCAT®
cycle received
UINT RO 2

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3.4.2 PDO index 0x1A20 AI:
PDO index: x1a20 -> used with OpMode = DC-Sync-PLL
Name: AI
PDO index: x6020
Subindex: 1
Name: CH1
Description: measurement value in mV/V; one measurement value is transferred
per EtherCAT® cycle
Index (hex) Name Meaning Data type Flags Size
0x6020:01 CH1 Current measurement value in
mV/V
REAL RO 4
3.4.3 PDO index 0x1A30 AI:
PDO index: x1A30 -> used with OpMode = DC-Sync-PLL-OS10
Name: AI
PDO index: x6020
Subindex: 1
Description: 10 measurement values in mV/V; 10 measurement values are trans
ferred per EtherCAT® cycle
Index (hex) Name Meaning Data type Flags Size
0x6030:01 CH1_1 Measurement value 1 of 10 in mV/V REAL RO 4
0x6030:02 CH1_2 Measurement value 2 of 10 in mV/V REAL RO 4
0x6030:03 CH1_3 Measurement value 3 of 10 in mV/V REAL RO 4
0x6030:04 CH1_4 Measurement value 4 of 10 in mV/V REAL RO 4
0x6030:05 CH1_5 Measurement value 5 of 10 in mV/V REAL RO 4
0x6030:06 CH1_6 Measurement value 6 of 10 in mV/V REAL RO 4
0x6030:07 CH1_7 Measurement value 7 of 10 in mV/V REAL RO 4
0x6030:08 CH1_8 Measurement value 8 of 10 in mV/V REAL RO 4
0x6030:09 CH1_9 Measurement value 9 of 10 in mV/V REAL RO 4
0x6030:0A CH1_10 Measurement value 10 of 10 in mV/V REAL RO 4

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3.4.4 SDO overview
Index (hex) Name Meaning Data type Flags Default
1000 Device type In-line measuring amplifier RO
1001 Error
register
Contains all error codes that
may occur
RO
1008 Device
name
GTM-ILA RO GTM ILA
1009 Hardware
version
Used to distinguish between
possible, different hardware
versions with different
capabilities.
RW
100A Software
version
Current software version RO
8020 AI Settings
Index (hex) Name Meaning Data type Flags Default
8020:01 AD timing Sample rate S/s:
1: 40,000
2: 20,000
6: 10,000
9: 5,000
10: 4,000
11: 2,000
12: 1,000*default
13: 500
14: 200
15: 100
RW 0x000C
(12dec)
Note: 8020:01
- The EtherCAT® communication cycle time must correspond to the selected sample rate.
- If oversampling is switched off, the cycle time should be equal to the sample period
(1/sample rate).
- If oversampling is switched on, the cycle time should be 10 times slower than the sample
period (0.1/sample rate).

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DefaultFlagsData typeMeaningNameIndex (hex)
8020:02 PowerOn
Default
0*default: All current device
settings are always stored in the
internal non-volatile memory
and are restored each time the
device is switched on.
1: The current device settings are
not automatically written to the
non-volatile memory and are not
restored when the device is
switched on.
2: The current settings are
written to the non-volatile
memory once and the power-on
default value is reset to the
original value after the next
power-on.
3: Restores the settings currently
stored in the non-volatile
memory.
6: Restores the original factory
settings stored in the non-
volatile memory.
RW 0x0001
(1dec)
Note: 8020:02
- An adjustment of the PowerOn default value requires a restart of the ILA (Power Off -> On).
Only then the changes will be applied.
- When making adjustments, always ensure that the PowerOn Default mode matches your
application.
8020:03 Scaling type Scaling of the measurement
values to mV/V
RW 0x0002
(2dec)
Note: 8020:03
Please do not carry out any adjustments.
8020:04 Serial
Number
Serial number of the device RW
8020:05 Calibration
Date
Date of the last calibration check RW
8020:06 Adjust Date Date of the last calibration
adjustment
RW
8020:07 Buffered
Input
Unbuffered mode = standard
EtherCAT® mode
RW 0x0000
(0dec)
Note: 8020:07
Please do not carry out any adjustments.

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DefaultFlagsData typeMeaningNameIndex (hex)
8020:08 Low Pass
Filter
Filter selection:
0: Off
1: FIR filter*default
2: Blackmann-Harris filter
RW 0x0001
(1dec)
8020:09 Key Internal use; not relevant RW 0
8020:0A Apply Key Internal use; not relevant RW 0x0
8020:0B Oversampli
ng
Oversampling:
0: No oversampling*default
1: Oversampling, 10 measure
ment values per EtherCAT® cycle
RW 0x0000
(0dec)
Note: 8020:0B
- The device automatically switches oversampling mode depending on the operation mode
selected in the distributed clocks menu in TwinCAT.
- When the operation mode changes, the oversampling SDO value is changed automatically.
8040 module 1 settings
Index (hex) Name Meaning Data type Flags Default
8040:0C Offset1 Internal use; not relevant RW
8040:0D Gain1 Internal use; not relevant RW
8040:16 UserOffset Measurement value offset
adjustment
RW
8040:17 UserGain Measurement value gain
adjustment
RW
1018 identity
Standard EtherCAT® identity information. Vendor ID, product code and revision
define the ESI file. The serial number is specific for each device.
Index (hex) Name Meaning Data type Flags Default
1018:01 Vendor ID GTM = 0x00000CDB RO 0x0000CDB
(3291dec)
1018:02 Product code 0xA9 RO
1018:03 Revision Device revision RO
1018:04 Serial number Device-specific RO