Akytec MV110-24.1TD User manual

akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
MV110-24.1TD
Strain gauge module
User guide
MV110-24.1TD_2017.06_0238_EN
© All rights reserved
Subject to technical changes and misprints

akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
1
Contents
1Overview..........................................................................................................................................................2
1.1 Functions .................................................................................................................................................2
1.2 RS485 network........................................................................................................................................2
2Specifications.................................................................................................................................................3
2.1 Environmental conditions.........................................................................................................................4
3Safety...............................................................................................................................................................5
4Design..............................................................................................................................................................6
5Installation.......................................................................................................................................................7
5.1 Wiring.......................................................................................................................................................7
6Configuration..................................................................................................................................................9
7Operation.......................................................................................................................................................11
7.1 Measurement range...............................................................................................................................11
7.2 Measured value.....................................................................................................................................11
7.3 Excitation voltage...................................................................................................................................11
7.4 Tare zero offset......................................................................................................................................11
7.4.1 Tare weight........................................................................................................................................11
7.4.2 Tare weight multiplying......................................................................................................................11
8Restore factory settings ..............................................................................................................................12
9Maintenance..................................................................................................................................................14
10 Transportation and storage.........................................................................................................................15
11 Scope of delivery..........................................................................................................................................16
Appendix A Dimensions ...................................................................................................................................17
Appendix B Modbus addressing......................................................................................................................18
Appendix С Calibration.....................................................................................................................................21

Overview
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany Tel.: [phone] · www.akytec.de
2
1 Overview
1.1 Functions
The module MU110-24.1TD is a 1-channel input module for resistor bridges (strain
gauge). The module enables the direct connection of a resistor measurement bridge.
The module provides following functions:
–module control and parametrization via Modbus network
–RS485 network diagnostic
–sensor error indication
–Slave in the RS485 network.
The module is to be configured using ‘M110 Configurator’ software (included on CD) via
RS485-USB interface adapter IC4 (not included). The latest version of the configuration
software is available for download on www.akytec.de.
1.2 RS485 network
I/O modules of series Mx110 use the common standard RS485 for data exchange.
Serial interface RS485 enables communication via two-wired line in half-duplex mode.
The module supports the Modbus-RTU and Modbus-ASCII protocols with automatic pro-
tocol detection.
The network consists of a Master device and can contain up to 32 Slave devices. Maxi-
mum length is 1200 m. The number of Slave devices and network length can be in-
creased using RS485 interface repeater.
Devices are connected to a network according to linear (bus) topology. It means that the
line goes from the first device to the second one, from the second one to the third one,
etc. Star connection and spur lines are not allowed.
Line reflections always occur at each of the 2 ends of the bus (the first and the last node).
The higher the data transmission rate, the stronger they are. A terminating resistor is
needed to minimize reflections. Line termination may be a 150 ohms value (0.5 W) resis-
tor.
All modules can be used as Slave devices only. Master device can be PLC, computer
with SCADA software or control panel.

Specifications
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2 Specifications
Table 2.1 General data
Power supply
24 (20…28) V DC
Power consumption, max.
5 W
Measuring channels
1
Connection circuit
4- or 6-wire
Bridge resistance
87...1000 ohm *
Excitation voltage
2.5 V AC/DC ± 5%
Warm-up time, max.
20 min
ADC resolution **
24 bit
RS485 interface
Connection
D+, D-
Protocols
Modbus RTU/ASCII, akYtec
Baud rate
2.4…115.2 kbit/s
Data bits
7, 8
Parity
none, even, odd
Stop bits
1, 2
Dimensions
63 x 110 x 75 mm
Weight
approx. 300 g
Material
plastic
* Four 350 ohm resistance bridges can be connected in parallel
** For measuring channel accuracy depending on strain gauge sensitivity see Table 2.2
Table 2.2 Measuring channel accuracy depending on the strain gauge rated output
Strain gauge rated
output, mV/V
Measuring range,
mV
Resolution, µV
Basic accuracy,
% FS
1
-4.0…+4.0
1.5
± 0.05
2
-7.5…+7.5
1.5
4
-15…+15
1.5
8
-35…+35
1.5
16
-70…+70
2.0
32
-140…+140
2.0
64
-300…+300
3.5
* Temperature drift within 10°C deviation from (20 ± 5)°C is not greater than the basic
accuracy
Table 2.3 Maximum refresh interval depending on sampling frequency
Sampling frequency, Hz
Refresh interval, ms
DC excitation voltage
AC excitation voltage
8.197
125
350
16.39
65
230
19.61
54
210
24.27
45
190
25.77
41
185
34.25
32
166
42.37
26
154
44.64
24
150
50.51
22
146
69.44
16
135

Specifications
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany Tel.: [phone] · www.akytec.de
4
Sampling frequency, Hz
Refresh interval, ms
DC excitation voltage
AC excitation voltage
144.9
8
120
257.7
4.3
115
409.8
3
112
588.2
2.1
110
Table 2.4 Galvanic isolation
From each group to chassis
3.0 kV
Power supply to measuring circuits
1.8 kV
Power supply to RS485 interface
1.5 kV
RS485 interface to measuring circuits
0.75 kV
2.1 Environmental conditions
The following environment conditions must be met:
clean, dry and controlled environment, low dust level
closed non-hazardous areas, free of corrosive or flammable gases
Table 2.5
Condition
Permissible range
Ambient temperature
-20…+55 °C
Transportation and storage
-25…+55 °C
Relative humidity
up to 95% (at +35°C, non-condensing)
IP Code
Enclosure IP20, terminals IP10
Altitude
up to 2000 m above sea level

Safety
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3 Safety
Explanation of the symbols and keywords used:
DANGER
DANGER indicates an imminently hazardous situation which, if not avoided, will
result in death or serious injury.
WARNING
WARNING indicates a potentially hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION
CAUTION indicates a potentially hazardous situation which, if not avoided, could
result in minor or moderate injury
►
NOTICE
NOTICE indicates a potentially harmful situation which, if not avoided, may result in
damage of the product itself or of adjacent objects.
Intended use
The device has been designed and built solely for the intended use described in this
guide, and may only be used accordingly. The technical specifications contained in this
guide must be observed.
The module may be operated only in properly installed condition.
Improper use
Any other use is considered improper. Especially to note:
–This device should not be used for medical devices which receive, control or other-
wise affect human life or physical health.
–The device should not be used in an explosive environment.
–The device should not be used in an atmosphere with chemically active substance.

Design
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4 Design
–Enclosure plastic, grey, for DIN-rail or wall mounting
–Terminal blocks 2 plug-in terminal blocks with 24 screw terminals
–“POWER” LED power supply indicator
–“RS-485” LED flashes at data exchange over serial port
–“SENSOR”LED lights if sensor break or measuring channel overload
Fig. 4.1

Installation
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5 Installation
CAUTION
Improper installation
Improper installation can cause serious or minor injuries or damage the device.
Installation must be performed only by fully qualified personnel.
–The module is intended to be mounted in a cabinet on DIN-rail or on the wall. For the
dimension drawings see Appendix A.
–Install the module in a cabinet with clean, dry and controlled environment. For further
details see 2.1.
–The module is designed for natural convection cooling. It should be taken into ac-
count when choosing the installation site.
5.1 Wiring
DANGER
Dangerous voltage
Electric shock could kill or seriously injure.
All electrical connections must be performed by a fully qualified electrician.
Ensure that the mains voltage matches the voltage marked on the nameplate!
Ensure that the device is provided with its own power supply line and electric fuse!
CAUTION
Switch on the power supply only after the wiring of the device has been completely
performed.
–The electrical connections are shown in Fig. 4.1 and the terminal assignments in
Table 5.1.
–The inputs should be wired in accordance with Fig. 5.1, 5.2.
–Connect the power supply to the terminals 24V / 0V.
–The maximum conductor cross-section for power supply is 1.5 mm².
►
NOTICE
Signal cables should be routed separately or screened from the supply cables. Only
a shielded cable may be used for signal lines.
–Connect the RS485 lines to terminals D+ and D-.
–Twisted pair cable should be used for the connection to RS485 interface. Maximal
cable length is 1200 m.
Table 5.1 Terminal assignments
No
Designa-
tion
Description
No
Designation
Description
1
0 V
Power supply
13
SIG-
Signal -
2
24 V
Power supply
14
NC
not connected
3
NC
not connected
15
SIG+
Signal +
4
NC
not connected
16
NC
not connected
5
DEF
Default settings
17
EXC+
Excitation voltage +
6
NC
not connected
18
NC
not connected
7
GND
Common ground
19
SEMS+
Sensor feedback +
8
NC
not connected
20
NC
not connected
9
NC
not connected
21
SENS-
Sensor feedback -
10
GND_RS
RS485 ground
22
NC
not connected
11
D+
RS485 D+
23
EXC-
Excitation voltage -
12
D-
RS485 D-
24
SHIELD
Sensor shield

Installation
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Fig. 5.1 4-wire connection
4-wire sensor connection is used when the cable length is less than 2 m. The terminals
EXC (+/-) and SENS (+/-) should be bridged on the terminal block, as shown in Fig. 5.1.
Fig. 5.2 6-wire connection

Configuration
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6 Configuration
►
NOTICE
Before starting
Before switching on, make sure that the device was stored at the specified ambi-
ent temperature (-10 ... +55 °C) for at least 30 minutes.
Parameters of the module can be read, edited and saved with “M110 Configurator”soft-
ware (on the CD included). The full list of parameters is shown in the Table 6.1.
To control the module via Modbus network refer to Appendix B “Modbus addressing”
The module should be configured first before operating in RS485 network.
Proceed as follows:
–install M110 Configurator on the PC
–connect the module to the USB interface of the PC over RS485-USB interface
adapter IC4 (not included)
–connect the power supply to the terminals 24V / 0V
–turn on the device
–start the M110 Configurator.
If the factory settings of the module have not been changed, the connection to the mod-
ule is automatically established, the module automatically recognized, its configuration
parameters read out and an appropriate configuration mask open.
If it does not happen, parameters of the configurator should be changed.
Table 6.1 Configuration parameters
Name
Parameter
Valid
value
Meaning
Default
setting
Ac-
cess
Basic parameters
dev
Device
Up to 8 symbols
R
ver
Firmware
Up to 5 symbols
R
tdev
Number of channels
0
1 channel
R
Network parameters
Bbs
Baud rate, kbit/s
0
2.4
9.6
R/W
1
4.8
2
9.6
3
14.4
4
19.2
5
28.8
6
38.4
7
57.6
8
115.2
Prty
Parity *
0
none
none
R/W
1
even
2
odd
Sbit
Stop bits *
0
1
1
R/W
1
2
Len
Data bits *
0
7
8
R/W
1
8
A.Len
Address bits
0
8
8
R/W
1
11
Addr
Device address
1…247
16
R/W
Rs.dL
Response delay, ms
0…255
2
R/W