iSMA iSMA-B-FCU Series User manual

iSMA-B-FCU
User Manual
FCU Hardware
Global Control 5 Sp. z o.o.
Warsaw, Poland
www.gc5.pl

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Table of contents
1Introduction 3
1.1 Document change log 3
1.2 Safety rules 3
1.3 Technical specifications 4
1.4 Dimensions 6
2Hardware specification 7
2.1 Diagram of terminals and internal connections 7
iSMA-B-FCU-HH 7
iSMA-B-FCU-HL 8
iSMA-B-FCU-LL 9
2.2 Power supply connection 10
24V AC power supply for external equipment 10
2.3 Connecting the communication bus (RS485) 11
RS485 grounding and shielding 11
RS485 network termination 11
2.4 RJ12 Panel connection 12
2.5 Mini USB Port 12
2.6 Front panel LED functions 12
2.7 Setting controller address 13
2.8 Baud rate selection 14
2.9 Protocol selection 15
2.10 Restoring the default settings 15
2.11 Default settings 15
2.12 CFG DIP switch 16
3ISMA-B-FCU device inputs 17
3.1 Special Inputs 17
Special Inputs operating as digital inputs 17
Special Inputs operating as 0-10 V DC analog inputs 18
Special Inputs operating as resistance inputs 18
Special Inputs operating as temperature inputs 19
3.2 Digital Inputs 20
Digital Input fast counter 20
4ISMA-B-FCU device outputs 21
4.1 Triac Outputs 21
4.2 Digital Outputs 22
O1 – O3 relays “Fan” 22
O4 – HTG relay “Electrical Heater” 22
O5 – CLG relay “Electrical Cooler” 23
4.3 Analog Outputs 24
5MAC DIP SWITCH addressing table 26
6List of supported temperature sensors 32

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1Introduction
This document presents ISMA-B-FCU device hardware information.
1.1 Document change log
V1.1 – iSMA-B-FCU-LL hardware description added
1.2 Safety rules
•Please note: incorrect wiring of this product can cause its’ damage and may result in other
hazards. Make sure the product has been correctly wired before turning the power ON.
•Before wiring, or removing / mounting the product, be sure to turn the power OFF. Failure to
do so might cause electric shock.
•Do not touch electrically charged parts such as the power terminals. Doing so might cause
electric shock.
•Do not disassemble the product. Doing so might cause electric shock or faulty operation.
•Use the product within the operating ranges recommended in the specification (temperature,
humidity, voltage, shock, mounting direction, atmosphere etc.). Failure to do so might cause
fire or faulty operation.
•Tighten the wires firmly to the terminal. Insufficient tightening of the wires to the terminal
might cause fire.

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1.3 Technical specifications
iSMA-B-FCU-HH
iSMA-B-FCU-HL
iSMA-B-FCU-LL
Power supply
Voltage
230V AC ± 10%
24V AC ± 10%
Power consumption
Max 12VA (Including 7 VA for Triac outputs)
Special Inputs
Temperature input
Measurement with attached RTDs
resolution ±0.1°C
accuracy ±0.2°C at 25°C
Voltage input
Voltage measurement from 0 to 10 VDC
(Input impedance 120 KΩ)
resolution ±6 mV
accuracy ±50 mV
Resistance input
Resistance measurement from 0 to 700 kΩ
Measurement resolution ±20 Ω for 20 kΩ load
Dry contact input
Output current ~0.2 mA
Measurement resolution
12 bits
Digital Inputs
Type
Dry contact
Max input frequency
100Hz
Analog Outputs
Voltage range
0 to 10 V DC
Max. load current
5 mA
Resolution
12 bits
Accuracy
±1%
Digital Outputs
(relays)
Resistive load
(FAN, CTG)
6A at 230V AC or 6A at 30V DC
Inductive load AC3
(FAN, CTG)
75VA at 230 V AC or 10 W at 30 V DC
Resistive load (HTG)
10A at 230V AC or 10 A at 30 V DC
Inductive load AC3
(HTG)
1/2 HP at 230 V AC
Triac Outputs
Load
Min: 20 mA
Max: 0.5 A at
230 V AC
Min: 20 mA
Max: 0.3 A at
24 V AC
Imax = 0.3 A =
ITO1 + ITO2 + I24VOut
Min: 20 mA
Max: 0.5 A at 24 V
AC
Peak load per channel
1.5 A (30 s)
Gate Control
Zero crossing turn ON
Frequency Range
47 to 63 Hz
Snubber
Snubberless Triac
Power Supply
output
Power Supply output
24 V AC ± 20%,
7 VA
24 V AC ± 20%, 7 VA*
* In HL this Power Supply is also
used for Triac Outputs
RS485
RS485
Up to 128 devices

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Interface
Failsafe Receiver (Bus Open, Bus Shorted, Bus Idle)
Communication
protocols
Modbus RTU, Modbus ASCII or BACnet MSTP
set by switch
Baud rate
From 2400 to 115200 set by switch
Address
0 to 255 set by DIP switch
RJ12 Interface
RS485
Up to 128 devices
Communication
protocol
Modbus RTU
Baud rate
From 2400 to 115200
Power supply
34 V DC ± 15%, 2.5 W
USB
USB
Mini USB 2.0
Ingress
protection
IP
IP40
Temperature
Storage
– 40°C to +85°C
Operating
0°C to +50°C
Humidity
Relative
5 to 95%
Connectors
Inputs / Outputs,
Power Supply and
Communication
Removable
HTG Relay
Constant
Maximum cable size
1.5 mm2
Dimensions
Width
123 mm
Length
137 mm
Height
55 mm
Table 1 Technical specification

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1.4 Dimensions
Figure 1 iSMA-B-FCU dimensions (all versions)

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2Hardware specification
2.1 Terminals and internal connection diagram
There are 3 types of hardware available:
•iSMA-B-FCU-HH with 230 V AC power supply and Triac Outputs,
•iSMA-B-FCU-HL with 230 V AC power supply and 24 V AC Triac Outputs,
•iSMA-B-FCU-LL with 24 V AC power supply and Triac Outputs.
2.1.1 iSMA-B-FCU-HH
iSMA-B-FCU-HH has a high voltage power supply (230 V AC) and high voltage Triac Outputs
(230 VAC). The Triac Outputs are connected directly to the main controller power supply as
presented in diagram below. The maximum current for each Triac Output is 0.5 A. The maximum
power consumed by external equipment connected to the
24 V terminals (L2, N2) cannot exceed 7VA in total.
Figure 2 iSMA-B-FCU-HH diagram of terminals and internal connections

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2.1.2 iSMA-B-FCU-HL
iSMA-B-FCU-HL has a high voltage power supply (230 V AC) and low voltage Triac Outputs (24 V
AC). The Triac Outputs are connected to a built-in 24 V AC transformer as shown in the below
diagram. The maximum power consumed by the external equipment connected to the Triac
Outputs and to 24 V terminals (L2, N2) cannot exceed 7 VA in total.
Figure 3 iSMA-B-FCU-HL diagram of terminals and internal connections

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2.1.3 iSMA-B-FCU-LL
iSMA-B-FCU-LL has a low voltage power supply and Triac Outputs (24 V AC). The Triac Outputs are
connected to power supply terminals. The maximum current for each of the Triac Outputs is 0.5 A.
The maximum power used by external equipment connected to the 24 V terminals (L2, N2) cannot
exceed 7 VA in total.
Figure 4 iSAM-B-FCU-LL diagram of terminals and internal connections

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2.2 Power supply connection
iSMA-B-FCU-HH and iSMA-B-FCU-HL are designed to work with 230 V AC power supply. Each ISMA-
B-FCU device is equipped with a built-in 6 A fuse protecting the controller and connected 230 VAC
equipment.
Figure 5 230 V AC Power supply connection
iSMA-B-FCU-LL is designed to work with 24 V AC power supply. The device is equipped with a built-
in 6 A fuse protecting the controller and connected 24 V AC equipment.
Figure 6 24 V AC Power supply connection
Note: Total current for digital relay outputs O1-O4 cannot exceed 6A.
Note: It is forbidden to use a fuse with current exceeding 6 A! Higher current may permanently
damage the device and cause danger to the user and to the equipment!
2.2.1. 24 V AC power supply for external equipment
iSMA-B-FCU-HH is equipped with a 24 V AC, 7 VA power supply output to supply an external
equipment like sensors and actuators. This power supply uses a separate coil in the transformer.
24 V AC power supply terminal connection is labeled L2, N2.
iSMA-B-FCU-HL is equipped with a 24 V AC power supply output for thermal valves controlled by
Triac Outputs and external devices like sensors and actuators. This power supply uses a separate
coil in the transformer. 24 V AC power supply terminal connection is labeled L2, N2. The total power

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consumption with thermal valves and external devices cannot exceed 7 VA (~0.3 A).
iSMA-B-FCU-LL is equipped with a 24 V AC, 7 VA power supply output to supply the external
equipment like sensors and actuators. This power supply uses a separate 24 V AC transformer.
The external separate power supply terminal connection is labeled L2, N2.
2.3 Connecting the communication bus (RS485)
Figure 7 RS485 connection
2.3.1 RS485 grounding and shielding
This device can be exposed to electromagnetic field. Electromagnetic radiation can induce
electrical noise into both power and signal lines, as well as direct radiation into the FCU device with
negative results for the system. Appropriate grounding, shielding and other protective steps should
be taken at the stage of installation to prevent these effects. These protective steps include
grounding the control cabinet and the cable shield, installing protective elements for
electromagnetic switching devices, correct wiring, as well as proper choice of cable types and their
cross sections.
2.3.2 RS 485 network termination
Transmission line effects often present a problem for data communication networks. These
problems include reflections and signal attenuation.
To eliminate the presence of reflections of signal from the end of the cable, the cable must be
terminated at both ends with a resistor across the line adequate to its characteristic impedance.
Both ends must be terminated since propagation is bidirectional. In case of an RS485 twisted
pair cable this termination is typically 120 Ω.

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2.4 RJ12 Panel connection
RJ12 socket is designed for connecting external modules and LCD panel. The ISMA-B-FCU
device has two parallel sockets with the same pin configuration. Those sockets provide
communication in Modbus RTU protocol.
RJ12 socket provides also power supply dedicated for external LCD panels with maximum load
up to 2.5 W. Before connecting devices powered from RJ12 please calculate the power supply
load. Power consumption of the dedicated wall panel iSMA-B-LP with temperature sensor is 0.5
W, so the maximum number of panels on the bus is 5.
RJ12 pins are shown in the figure below.
Figure 8 RJ12 pin description
For short distance, up to 100 m, it is recommended to use the following cables for connection:
standard category 3, 4 wire or 6 wire telephone cable straight without crossing (for example
YTLYP 6x0.12). For longer distance, it is recommended to use twisted shielded Modbus standard
cable.
2.5 Mini USB Port
The iSMA-B-FCU device has a built-in mini USB port designed to manage controller firmware and
application, as well as for diagnostics.
This USB port also provides controller power supply for commissioning processes and for
application diagnostics. When the controller is powered up by a USB, all inputs and outputs are
operational (except for Triac Outputs which require external power supply).
2.6 Front panel LED functions
The ISMA-B-FCU device is equipped with 4 LED diodes for quick status check and diagnostics:
•Power LED lights up (green) after turning the power on.
•Communication LED lights up (orange) for 20 ms after sending each package through the main
RS485 port. As long as module receives/sends packages, the Communication LED blinks
continuously.

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•Extension Communication LED lights up (orange) for 20 ms after sending each package
through the extension ports. As long as the module receives / sends packages, the Extension
Communication LED blinks continuously.
•User LED is OFF as default, the function is programmable through LED_ALARM component; it
blinks very softly when there is a fault during the start-up of Sedona virtual machine.
•During device reset, when Switch 6 in DIP switch PROTOCOL is in ON position (default settings
restoration mode), Power LED blinks in 300 ms time intervals. After Switch 6 is switched OFF,
Power LED is lit permanently and the default settings are restored.
•When the device remains in bootloader status, the Power LED and the Communication LED blink
alternatively. The communication LED keeps its functionality and blinks also after
sending/receiving data packages.
2.7 Setting Controller Address
The Controller Address is a setting made with a Dip switch MAC. The procedure of setting the
address in presented in the figure and table below. The addressing table is shown at the end of
this document.
Figure 9 MAC Dip Switch
Number of
Dip Switch
MAC
Position
Function
1
On
Add 1 to MAC Address
Off
Add 0 to MAC Address
2
On
Add 2 to MAC Address
Off
Add 0 to MAC Address
3
On
Add 4 to MAC Address
Off
Add 0 to MAC Address
4
On
Add 8 to MAC Address
Off
Add 0 to MAC Address
5
On
Add 16 to MAC Address
Off
Add 0 to MAC Address
6
On
Add 32 to MAC Address
Off
Add 0 to MAC Address
7
On
Add 64 to MAC Address

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Off
Add 0 to MAC Address
8
On
Add 128 to MAC Address
Off
Add 0 to MAC Address
Table 1 Setting MAC address with a Dip Switch
Example: Configuration setting of the ISMA-B-FCU device address 83.
Address 83 contains following multiplicity of number 2: 83 = 1 + 2 + 16 + 64. Address DIP switch
settings are presented in the table below. All addresses of DIP switch configuration are presented
in the table at the end of this document.
Address
S1
S2
S3
S4
S5
S6
S7
S8
83
On
On
On
On
Table 2 Address 83 DIP switch configuration
Figure 10 MAC DIP switch address 83 settings
WARNING! In BACnet network setting, the address above 128 automatically switches BACnet to
Slave mode. In this mode, the device cannot be discovered in device searching process.
WARNING! Do not set address 255 (all switches in ON position). This address setting is reserved
for system operation.
2.8 Baud rate selection
Transmission baud rate is determined by S3 switch (sections 1, 2, and 3) in accordance with the
following table:
1
2
3
Baud rate
OFF (0)
OFF (0)
OFF (0)
Defined by the user
OFF (0)
OFF (0)
ON (1)
76800
OFF (0)
ON (1)
OFF (0)
4800
OFF (0)
ON (1)
ON (1)
9600
ON (1)
OFF (0)
OFF (0)
19200
ON (1)
OFF (0)
ON (1)
38400
ON (1)
ON (1)
OFF (0)
57600
ON (1)
ON (1)
ON (1)
115200
Table 2 Baud rate selection

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2.9 Protocol selection
Protocol selection is made with sections 4 and 5 of the S3 switch according to the table:
4
5
Protocol
OFF (0)
OFF (0)
Modbus RTU
OFF (0)
ON (1)
Modbus ASCII
ON (1)
OFF (0)
BACnet Master
ON (1)
ON (1)
BACnet Slave
Table 3 Protocol selection
WARNING! In BACnet mode switch number 4 must be on ON(1) position and switch number 5
decides if BACnet works in Master or Slave mode (please check on the above table).
2.10 Restoring the default settings
To restore the default ISMA-B-FCU device settings, follow the steps below:
1. Turn power supply off
2. Set section 6 of Protocol switch to ON
3. Turn on power supply, power LED blinking
4. Switch section 6 of Protocol switch to OFF to restore the default settings. To cancel the reset,
turn off the power and switch section 6 of Protocol switch to the OFF position.
2.11 Default Settings
Out of the box device as well as after restoring default values procedure, has got the following
default settings:
Name
Default Value
USER BAUD RATE
76800
STOP BITS
1
DATA BITS
8
PARITY BITS
0
RESPONSE DELAY
0
I1 – I4 DIGITAL INPUT COUNTERS
0
Table 4 Default values

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2.12 CFG DIP switch
The ISMA-B-FCU device has, on the top panel, 8 position DIP switch which can be used in client
application. Each of 8 positions can have true or false state. This DIP switch is dedicated for setting
configuration in client application.
Figure 11 DIP switch CFG

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3ISMA-B-FCU device inputs
ISMA-B-FCU device has two types of inputs: 4 Digital Inputs – for Boolean values, and 4 Special
Inputs – for resistance and voltage measurement.
3.1 Special Inputs
ISMA-B-FCU device has 4 built-in special inputs which can work in the following modes:
•Digital Input – dry contact,
•Analog Input - 0-10 V DC,
•Resistance Input- 0 – 1000 kΩ (1 MΩ),
•Temperature Input - working with NTC sensors.
3.1.1 Special Inputs working as digital input
In this mode, Special Input works as a digital input dry contact and reactive Boolean value, false
for open circuit and true for close circuit. Circuit status is measured with
1 mA current.
Figure 12 Connection of Special Inputs Dry Contact

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3.1.2 Special Inputs working as analog input 0-10 V DC
In this mode, Special Input measures voltage in the range from 0 to 10 V DC (10 000 mV) with 6
mV resolution.
Figure 13 Connection of the Special Inputs voltage sensor
3.1.3 Special Inputs operating as resistance inputs
In this mode, Special Input measures resistance value with voltage driver. The input works in
range from 0 to 1000 kΩ (1 MΩ), with resolution ±20 Ω for 20 kΩ load.
Figure 14 Connection of Special Inputs resistance sensor

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3.1.4 Special Inputs working as temperature inputs
In this mode, Special Input measures NTC sensor resistance with voltage driver and converts to
temperature value. Special Input is equipped with a built-in conversion table for the following
NTC sensors:
•10K3A1 NTC B=3975K temperature sensor
•10K4A1 NTC B=3695K temperature sensor
•10K NTC B=3435K Carel temperature sensor
•20K6A1 NTC B=4262K temperature sensor
•2.2K3A1 NTC B=3975K temperature sensor
•3K3A1 NTC B=3975K temperature sensor
•30K6A1 NTC B=4262K temperature sensor
•SIE1 temperature sensor
•TAC1 temperature sensor
•SAT1 temperature sensor
Figure 15 Connection of Special Inputs NTC sensor

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3.2 Digital Inputs
ISMA-B-FCU device is equipped with 4 Digital Inputs. The figure below presents the way they are
connected.
Figure 16 Connection of Digital Inputs Dry Contact
3.2.1 Digital Input fast counter
Digital Input can work as a counter of dry contact impulses up to 100 Hz. Counter value is saved
in non-volatile EEPROM memory.
WARNING! During Restore to Default process, the value of the counter is set to 0.