Digitalize your building with iSMA – Intelligent Solution Managing Automation
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What do you think when you hear the “building” word?
you think home? Do you think the place where you spend time with your friends, with your co-workers, with your family? Do you think about a
place where you feel safe? How would you describe that building? Is it a
99-floor skyscraper, 2.000 square meters warehouse, a two-story house?
definition for each of us is different, but still, there is much in common in each of them. All of them have doors, windows, rooms, need ventilation systems. The building needs energy! Depending on the living area, each of the buildings needs a heating system when it's cold or a
cooling system when it gets too hot. The building, like a living organism, needs water to perform the basic functions for which it was designed. It needs lighting! To provide a sense of security we quip the building with alarm systems and intrusion detection, security cameras,
and access control.
What requires monitoring in the building?
seems like a lot of different areas in the building need to be
monitored and then controlled. To enable the building to perform, we
need to think about the things that need monitoring. Temperature
sensors, humidity sensors, presence sensors, motion sensors, contact
sensors, Water flow meters, energy meters, smoke detectors, wind speed
sensors, sun sensors… we can count for hours the things that may be
monitored in the building!
Pic. 1 Sensors enable data monitoring in modern buildings
we have all the sensors installed in the building. Now let's recognize what type of signals do we get from each sensor. Let's say we installed an NTC 10K temperature sensors, how do we get that data out of them?
Same thing with the presence, motion, wind speed sensors, and other types of sensors. To ensure many years of trouble-free operation most of the sensors that are used in the commercial buildings are based on
analog signals. A huge part of the data that is being monitored is based
on the 5 main input types -> Temperature, Resistance, Voltage,
Current and Binary Signals.
To ensure the possibility of
monitoring the data and to be able to control the building we need to
enable the conversion of analog values into the digital world. Ideally,
we would need one device or a group of devices that can gather all the
data from the building and convert it to a digital form that can be
Pic. 2 How to convert all the analog data to digital in the building?
Cost-effective solution for maintaining perfect building conditions
all the monitored data we can see and understand how the building
lives! That powerful knowledge can lead to, among others, the creation
of ideal temperature and humidity conditions inside the building as well
as in every room. Such a solution allows not only to maintain perfect
working and living conditions but also to ensure that it will be a
cost-effective solution in the long term.
Pic. 3 Monitoring the building can lead to cost-effective performance of a building
while we have all the data monitored and we know what would be
controlled we need equipment that physically enables control of the
fans, heaters, coolers, dumpers, inverters, actuators valves, and dozens
of devices used in the building.
At that point, we recognize
Analog and Digital Signals. The vast majority of devices can be
controlled with a 0-10 V signal that enables the device to work in the
range of 0-100%. In the inverter, the signal is responsible for 0-100%
of the motor speed. In the case of a three-way valve for mixing hot and
cold water. Digital signals are simple two states ON/OFF, TRUE/FALSE,
1/0 signals. With digital signals, a light can be turned on, a fan speed
can be controlled, cooler or heater can be enabled and disabled.
Pic. 4 To perform a building needs Input and Output signals
Building automation systems for communication and scalability
on the scale and the size of the building all devices might be
controlled from one place – a control panel or might be distributed all
over the building. From the rooftop where an Air Handling Unit (AHU) may
be placed to the basement with the heating substation. To enable
various devices in the building to share information they need to speak
the same language. In the Building Automation Systems (BAS) a standard
for open communication are:
Modbus – open communication protocol created in 1979 by Modicon, used widely as a standard protocol in automation
BACnet - open communication protocol created especially for Building Automation and Control (BAC) networks
To enable communication between devices, two types of physical connections are being used - RS485 and Ethernet.
Pic. 5 Enabling communication between devices is crucial in Building Automation Systems
BACnet (MS/TP and IP) and Modbus (RTU/ASCII or TCP/IP) are fully
operative and can share information between devices enabling monitoring
Input and Output used in the building
needs to be flexible in terms of scalability and the possibility of
implementing changes. That means open protocols, a full range of input
and outputs, and various communication methods. That is why 18 types of
iSMA I/O Modules can be found in iSMA portfolio, with support for all of
the types of Input and Output used in the building:
type of iSMA I/O Module can be found in -IP version with Ethernet
onboard or RS485 port only version. IP based iSMA I/O Modules are
equipped with BACnet IP, Modbus TCP/IP, and Modbus Gateway while serial
bus iSMA I/O Module with BACnet MS/TP and Modbus RTU/ASCII. Protocols
can be configured in seconds, without even connecting to the module
thanks to the DIP Switches located under the top cover.