B METERS ISMA-B-24I Multiprotocol I/O Module Installation Guide
- September 3, 2024
- B METERS
Table of Contents
ISMA-B-24I Multiprotocol I/O Module
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Product Information
Specifications:
- Ingress Protection Rating: IP20 – for indoor installation
- Power Supply: Shielded Twisted Cable, Output current ~1 mA
- Communication: RS485
- Dimensions: Not specified
- Housing Material: Not specified
Product Usage Instructions
Installation:
1. Ensure to read the installation guidelines provided in the
user manual before proceeding.
2. Electrical installation must comply with national wiring
codes and local regulations.
3. For any queries or assistance, contact iSMA CONTROLLI Support
Team at support@ismacontrolli.com.
Power Supply Considerations:
1. Use a shielded twisted cable for power supply
connections.
2. The output current should be around 1 mA.
Communication Setup:
1. Connect the device to the RS485 communication port using
appropriate cables.
2. Use the switches on the device to set the baudrate, protocol,
and device address.
3. Refer to the user manual for detailed instructions on
communication setup.
Digital Inputs:
1. The device has dry contact digital inputs labeled as I1 to
I24 and G0.
2. Check the status of digital inputs as per your installation
requirements.
3. Ensure jumpers are shorted to enable biasing if
necessary.
Mounting:
1. Mount the device securely in a suitable location using
appropriate fixtures.
2. Refer to the dimensions provided in the user manual for
accurate mounting.
Frequently Asked Questions (FAQ)
Q: Can the device be used outdoors?
A: No, the device is rated for indoor installation only with an
IP20 protection rating.
Q: How do I set the device address?
A: Use the switches on the device according to the formula
Address = S2*10 + S1 as specified in the manual.
Q: What is the recommended power supply connection?
A: Use a shielded twisted cable for power supply connections
with an output current of approximately 1 mA.
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ISMA-B-24I Installation Instructions
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iSMA-B-24I
DIGITAL INPUTS Dry contact
I1 I2 I3 I4 G0
Power supply Digital inputs Interface Address Baudrate Ingress protection
rating
Temperature
Relative humidity Connectors Dimensions Mounting Housing material
SPECIFICATION
DC: 24 V ± 20%, 1 W; AC: 24 V ± 20%, 3.2 VA 24 dry contact inputs, high-speed
pulse counter up to 100 Hz RS485 half duplex, Modbus or BACnet, up to 128
devices on the bus Set by switch in the range from 0 to 99 Set by switch in
the range from 4800 to 115200 bps
IP20 – for indoor installation
Operating: -10°C to +50°C (14°F to 122°F) Storage -40°C to +85°C (-40°F to
+185°F) 5 to 95% RH (without condensation) Separable, max 2.5 mm2 (1812 AWG)
106.30 x 113.60 x 62.00 mm (4.19 x 4.47 x 2.44 in) DIN rail mounting (DIN EN
50022 norm) Plastic, self-extinguishing PC/ABS
Status of digital inputs
TOP PANEL
mini USB
RS485 communication
Switch for setting baudrate, protocol, and restoring the default settings
Switches for setting the device address Address = S2*10 + S1
Status of digital inputs
Power supply
COMMUNICATION
POWER SUPPLY
Shielded Twisted Cable
Output current ~1 mA
RS485 TERMINATION
BLOCK DIAGRAM
I1 I2 I3 I4 G0 I5 I6 I7 I8 G0 I9 I10 I11 I12 G0 G0 RS485 RS485 +
Jumpers must be shorted to enable biasing
Bottom view of the board
+3.3V to µP
Digital Inputs
Digital Inputs
+3.3V to µP
I13 I14 I15 I16 G0 I17 I18 I19 I20 G0 I21 I22 I23 I24 G0 G
POWER G0
The performances stated in this sheet can be modified without any prior notice.
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EN 60730-1 POWER SUPPLY CONSIDERATIONS
Electrical safety in building automation and control systems are essentially
based on the use of extra low voltage, which is strictly separated from the
mains voltage. This low voltage is either SELV or PELV according to the EN
60730-1 standard. Protection against electric shock is ensured by the
following measures: · limitation of voltage (low voltage 24 V AC/DC supply,
either SELV or PELV); · protective separation of the SELV system from all
circuits other than SELV and PELV; · simple separation of the SELV system from
other SELV systems, from PELV systems, and earth. Field devices such as
sensors, status contacts, and actuators connected to the low-voltage inputs
and outputs of I/O modules must comply with the requirements for SELV or PELV.
The interfaces of field devices and other systems must also satisfy SELV or
PELV requirements. When the supply of SELV or PELV circuits is obtained from
supply mains of higher voltages, it shall be provided by a safety transformer
or a converter designed for continuous operation to supply SELV or PELV
circuits.
FCC COMPILANCE NOTE
Note: This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or more
of the following measures: · reorient or relocate the receiving antenna; ·
increase the separation between the equipment and receiver; · connect the
equipment into an outlet on a circuit different from that to which the
receiver is connected; · consult the dealer or an experienced radio/TV
technician for help.
WIRING
· Line power cables must be routed with spatial separation from signal and
data transmission cables. · Analog and digital signal cables should also be
separated. · It is recommended to use shielded cables for analog signals,
cable shields should not be interrupted by intermediate terminals. · The
shielding should be earthed directly after the cable enters the cabinet. · It
is recommended to install interference suppressors when switching inductive
loads (e.g. coils of contactors, relays, solenoid valves). RC snubbers or
varistors are suitable for AC voltage and freewheeling diodes for DC voltage
loads. The suppressing elements must be connected as close to the coil as
possible.
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INSTALLATION GUIDELINES
Please read the instruction before use or operating the device. In case of any
questions after reading this document, please contact the iSMA CONTROLLI
Support Team (support@ismacontrolli.com).
· Before wiring or removing/mounting the product, make sure to turn the power
off. Failure to do so might cause an electric shock. · 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. · 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.
Electrical installation of this product must be done in accordance with
national wiring codes and conform to local regulations.
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