SEDONA iSMA CONTROLLI iSMA-B-AAC20 User manual
www.ismacontrolli.com
DMP239en | 1st Issue rev. 0 | 02/2022
iSMA-B-AAC20
User Manual
Hardware
iSMA-B-AAC20 Hardware User Manual
www.ismacontrolli.com
DMP239en | 1st Issue rev. 0 | 02/2022
page 2 of 42
Table of Contents
1 Introduction ............................................................................................................................. 3
1.1 Revision History................................................................................................................................3
2 Safety Rules.............................................................................................................................. 4
3 Technical Specification .......................................................................................................... 5
4 Hardware Specification ......................................................................................................... 8
4.1 Hardware Versions..........................................................................................................................8
4.2 Power Supply....................................................................................................................................9
4.3 Grounding and Shielding............................................................................................................ 10
4.4 Front Panel for iSMA-B-AAC20 .................................................................................................. 11
4.5 Front Panel for iSMA-B-AAC20-LCD ......................................................................................... 11
4.6 Communication............................................................................................................................. 12
4.6.1 Ethernet .................................................................................................................................... 12
4.6.2 RS485 COM2............................................................................................................................ 13
4.6.3 1-Wire ........................................................................................................................................ 13
4.6.4 M-Bus ........................................................................................................................................ 13
4.6.5 DALI............................................................................................................................................ 14
4.6.6 USB............................................................................................................................................. 15
4.6.7 SD Card ..................................................................................................................................... 15
5 Inputs and Outputs.............................................................................................................. 16
5.1 Universal Inputs ............................................................................................................................ 16
5.1.1 Universal Input Voltage Connection .................................................................................. 16
5.1.2 Universal Input Current Connection.................................................................................. 17
5.1.3 Universal Input Resistance Connection ............................................................................ 17
5.1.4 Universal Input Dry Contact Connection .......................................................................... 18
5.2 Digital Inputs.................................................................................................................................. 18
5.2.1 Digital Input Counter ............................................................................................................. 18
5.3 Analog Outputs ............................................................................................................................. 18
5.3.1 Analog Output Voltage Connection ................................................................................... 19
5.3.2 Analog Output Relay Connection ....................................................................................... 19
5.3.3 Analog Output Actuator Connection ................................................................................. 20
5.4 Digital Outputs .............................................................................................................................. 20
5.4.1 Digital Output Electrovalve Connection ............................................................................ 20
5.4.2 Digital Output Resistive Load Connection........................................................................ 21
5.4.3 Digital Output Inductive Load Connection....................................................................... 21
5.5 List of Supported Temperature Sensors ................................................................................ 21
iSMA-B-AAC20 Hardware User Manual
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DMP239en | 1st Issue rev. 0 | 02/2022
page 3 of 42
1 Introduction
The iSMA-B-AAC20 is a universal controller with built-in different types of I/Os, which
operates based on the Sedona framework environment. Using a specific set of inputs and
outputs (8 UI, 4 DI, 6 AO, and 4 DO) allows to use the device in different applications. The
controller provides control, data logging, alarming, scheduling, integration.
To allow IP connectivity there are 2 Ethernet ports, which operate as two independent
ports. A built-in RS485 port can be used to expand the number of I/Os by connecting
MINI or MIX series I/O modules or to integrate with other subsystems.
The iSMA-B-AAC20 controller communicates in BACnet and Modbus protocols, and
additionally can come with M-Bus or DALI extensions.
The unique option in iSMA-B-AAC20 controllers is an LCD display, which allows for basic
service of the controller.
Figure 1. The iSMA-B-AAC20 controller
Figure 2. The iSMA-B-AAC20-D controller
Figure 3. The iSMA-B-AAC20-M controller
Figure 4. The iSMA-B-AAC20-LCD controller
Figure 5. The iSMA-B-AAC20-LCD-D
controller
Figure 6. The iSMA-B-AAC20-LCD-M
controller
1.1 Revision History
Rev. Date Description
1.0 28 Feb 2022 First edition
Table 1. Revision history
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DMP239en | 1st Issue rev. 0 | 02/2022
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2 Safety Rules
Improper wiring of the product can damage it and lead to other hazards. Make sure
that the product has been correctly wired before turning the power on.
Before wiring or removing/mounting the product, make sure to turn the power off.
Failure to do so might cause an electric shock.
Do not touch electrically charged parts such as power terminals. Doing so might cause
an electric shock.
Do not disassemble the product. Doing so might cause an electric shock or faulty
operation.
Use the product only within the operating ranges recommended in the specification
(temperature, humidity, voltage, shock, mounting direction, atmosphere, etc.). Failure
to do so might cause a fire or faulty operation.
Firmly tighten the wires to the terminal. Failure to do so might cause a fire.
Avoid installing the product in close proximity to high-power electrical devices and
cables, inductive loads, and switching devices. Proximity of such objects may cause an
uncontrolled interference, resulting in an instable operation of the product.
Proper arrangement of the power and signal cabling affects the operation of the entire
control system. Avoid laying the power and signal wiring in parallel cable trays. It can
cause interferences in monitored and control signals.
It is recommended to power controllers/modules with AC/DC power suppliers. They
provide better and more stable insulation for devices compared to AC/AC transformer
systems, which transmit disturbances and transient phenomena like surges and bursts
to devices. They also isolate products from inductive phenomena from other
transformers and loads.
Power supply systems for the product should be protected by external devices limiting
overvoltage and effects of lightning discharges.
Avoid powering the product and its controlled/monitored devices, especially high
power and inductive loads, from a single power source. Powering devices from a single
power source causes a risk of introducing disturbances from the loads to the control
devices.
If an AC/AC transformer is used to supply control devices, it is strongly recommended
to use a maximum 100 VA Class 2 transformer to avoid unwanted inductive effects,
which are dangerous for devices.
Long monitoring and control lines may cause loops in connection with the shared
power supply, causing disturbances in the operation of devices, including external
communication. It is recommended to use galvanic separators.
To protect signal and communication lines against external electromagnetic
interferences, use properly grounded shielded cables and ferrite beads.
Switching the digital output relays of large (exceeding specification) inductive loads can
cause interference pulses to the electronics installed inside the product. Therefore, it
is recommended to use external relays/contactors, etc. to switch such loads. The use
of controllers with triac outputs also limits similar overvoltage phenomena.
Many cases of disturbances and overvoltage in control systems are generated by
switched, inductive loads supplied by alternating mains voltage (AC 120/230 V). If they
do not have appropriate built-in noise reduction circuits, it is recommended to use
external circuits such as snubbers, varistors, or protection diodes to limit these effects.
iSMA-B-AAC20 Hardware User Manual
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DMP239en | 1st Issue rev. 0 | 02/2022
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3 Technical Specification
Power Supply Voltage 24 V AC/DC ± 20%
Power consumption 7 W at 24 V DC; 10.5 VA at 24 V AC
Universal Inputs Number of inputs 8
Temperature input Measurement with attached RTDS
Accuracy ±0.1˚C
For sensors PT1000 and NI1000 use 16-bit
resolution
Voltage input Voltage measurement from 0 to 10 V
Input impedance 100 kΩ
Measurement accuracy ±0.1%
Measurement resolution 3 mV at 12-bit and
1 mV at 16-bit
Current input Current measurement 0-20 mA
Required external resistor 200 Ω
Measurement accuracy: ±1.1%
Measurement resolution: 15 μA at 12-bit
and 5 μA at 16-bit
Resistance input Measurement of resistance: 0-1000 kΩ
Measurement resolution for 20 kΩ load: 20
Ω at 12-bit and 1 Ω at
16-bit
Measurement resolution for PT1000 and
NI1000: 0.1 Ω at 16-bit
Resistance measurement method: voltage
divider
Digital input Output current ~1 mA
Measurement resolution 12-bits (default) or 16-bits
Processing time 10 ms/channel at 12-bits
140 ms/channel at 16-bits
Digital Inputs Number of inputs 4
Type Dry contact or fast pulse counter up to 100
Hz
Analog Outputs Number of outputs 6
Voltage range 0-10 V DC
Max. load current 20 mA (A6 up to 5 mA)
Resolution 12-bits
Accuracy ±0.5%
iSMA-B-AAC20 Hardware User Manual
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DMP239en | 1st Issue rev. 0 | 02/2022
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Digital Outputs
(Relays)
Number of outputs 4
Contact material AgSnO2
Resistive load 3 A at 230 V AC or 3 A at 30 V DC
Inductive load 75 VA at 230 V AC or 30 W at 30 V DC
COM1 RS485 interface Up to 128 devices
Communication protocol Modbus RTU/ASCII (client)
Port RJ12
Baud rate 4800-115200
COM2 RS485 interface Up to 128 devices
Communication protocol Modbus RTU/ASCII (client/server)
BACnet MS/TP(client/server)
Port Screw connector
Baud rate 4800-115200
ETH1 Ethernet interface 2 ports, switch mode
Baud rate 10/100 Mb/s
USB1 USB 2.0 Type A
Communication Open protocols Modbus RTU/ASCII
Modbus TCP/IP
BACnet MS/TP
BACnet IP
M-Bus IP
SOX protocol
oBIX
1-Wire
DALI (iSMA-B-AAC20-D, iSMA-B-AAC20-LCD-
D)
Free software: AAC20 Updater & iSMA Tool
Built-in web server
Ingress Protection IP rating IP40
Temperature Storage -40˚C to +85˚C(-40°F to +185°F)
Operating -10˚C to +50˚C(14°Fto 122°F)
iSMA-B-AAC20 Hardware User Manual
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DMP239en | 1st Issue rev. 0 | 02/2022
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Humidity Relative 5% to 95% (without condensation)
Screw Connectors Type Separable
Maximum cable size 2.5 mm2
Dimensions Width 110 mm/4.33 in
Length 106 mm/4.17 in
Height 62 mm/2.44 in
Table 2. Technical specification
iSMA-B-AAC20 Hardware User Manual
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DMP239en | 1st Issue rev. 0 | 02/2022
page 8 of 42
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4 Hardware Specification
4.1 Hardware Versions
The iSMA-B-AAC20 controller is an advanced control device for building automation and
HVAC systems. The controller is based in the Sedona Virtual Machine (SVM), which allows
the user to quickly and easily program the controller in real time. Large number of inputs
and outputs allows to integrate with other devices and sensors (AAC20 provides 8 UI, 4
DI, 6 AO, and 4 DO). In addition, to increase the versatility of the controller, it supports
many open communications protocols such as BACnet, Modbus, SOX, DALI, M-Bus, 1-
Wire. The AAC20 is mounted in a housing adapted for DIN rail mounting or directly on a
panel. Separate, easy to remove connectors allow quick wiring without removing the
entire device.
The iSMA-B-AAC20 controller comes in six versions depending on native communication
protocols and hardware types (basic version and LCD equipped version, see Front Panel
for iSMA-B-AAC20 and Front Panel for iSMA-B-AAC20-LCD):
iSMA-B-AAC20: basic hardware version, native protocols: Modbus, BACnet, display
port, 1-Wire, and
iSMA-B-AAC20-LCD: LCD display, native protocols: Modbus, BACnet, display port, 1-
Wire:
Figure 7. AAC20 basic communication protocols version
iSMA-B-AAC20-M: basic hardware version, native protocols: Modbus, BACnet, display
port, 1-Wire, M-Bus, and
iSMA-B-AAC20-LCD-M: LCD display, native protocols: Modbus, BACnet, display port, 1-
Wire, M-Bus:
iSMA-B-AAC20 Hardware User Manual
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DMP239en | 1st Issue rev. 0 | 02/2022
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Figure 8. AAC20 extended M-Bus version
iSMA-B-AAC20-D: basic hardware version, native protocols: Modbus, BACnet, display
port, 1-Wire, DALI, and
iSMA-B-AAC20-LCD-D: LCD display, native protocols: Modbus, BACnet, display port, 1-
Wire, DALI:
Figure 9. AAC20 extended DALI version
4.2 Power Supply
The iSMA-B-AAC20 controllers are designed to work with 24 V AC/DC power supply.
iSMA-B-AAC20 Hardware User Manual
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DMP239en | 1st Issue rev. 0 | 02/2022
page 10 of 42
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Figure 10. AC power supply connection
Figure 11. DC power supply connection
4.3 Grounding and Shielding
In most cases controllers are installed in enclosures along with other devices, which
generate electromagnetic radiation (for example, relays, contactors, transformers, motor
invertors, etc.). Such electromagnetic radiation can induce electrical noise into both
power and signal lines, as well as direct radiation into the controller, causing negative
effects on the system. For this reason, an appropriate grounding, shielding, and other
protective steps should be taken at the installation stage to prevent negative
electromagnetic radiation effects, for example:
control cabinet grounding;
cable shield grounding;
using protective elements for electromagnetic switching devices;
proper wiring;
consideration of cable types and their cross sections;
and other.
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