B METERS ISMA-B-24I Multiprotocol I/O Module Installation Guide

Electrical installation must comply with national wiring codes and local regulations.
For any queries or assistance, contact the iSMA CONTROLLI Support Team at support@ismacontrolli.com.

Power Supply Considerations:

Use a shielded twisted cable for power supply connections.

The output current should be around 1 mA.

Communication Setup:

Connect the device to the RS485 communication port using the appropriate cables.
Use the switches on the device to set the baud rate, protocol, and device address.

Refer to the user manual for detailed instructions on communication setup.

Digital Inputs:

The device has dry contact digital inputs labeled as I1 to I24 and G0.
Check the status of digital inputs as per your installation requirements.

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.

FAQs

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.

SPECIFICATION

SPECIFICATION
Power supply	DC: 24 V ± 20%, 1 W; AC: 24 V ± 20%, 3.2 VA
Digital inputs	24 dry contact inputs, high-speed pulse counter up to 100 Hz
Interface	RS485 half duplex, Modbus or BACnet, up to 128 devices on the bus
Address	Set by switch in the range from 0 to 99
Baudrate	Set by switch in the range from 4800 to 115200 bps
Ingress protection rating	IP20 – for indoor installation
Temperature	Operating: -10°C to +50°C (14°F to 122°F) Storage -40°C to +85°C (-40°F to +185°F)
Relative humidity	5 to 95% RH (without condensation)
Connectors	Separable, max 2.5 mm2 (18–12 AWG)
Dimensions	106.30 x 113.60 x 62.00 mm (4.19 x 4.47 x 2.44 in)
Mounting	DIN rail mounting (DIN EN 50022 norm)
Housing material	Plastic, self-extinguishing PC/ABS

TOP PANEL

DIGITAL INPUTS

COMMUNICATION

POWER SUPPLY

RS485 TERMINATION

BLOCK DIAGRAM

EN 60730-1 POWER SUPPLY CONSIDERATIONS

Electrical safety in building automation and control systems is 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 COMPLIANCE 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 to 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.

INSTALLATION GUIDELINES

Please read the instructions before using 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. The proximity of such objects may cause uncontrolled interference, resulting in an unstable 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 of 100 VA Class 2 transformers 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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Documents / Resources

B METERS ISMA-B-24I Multiprotocol I/O Module [pdf] Installation Guide
ISMA-B-24I Multiprotocol I O Module, ISMA-B-24I, Multiprotocol I O Module, I O Module, Module

References

User Manual

B METERS ISMA-B-24I Multiprotocol I/O Module

Product Usage Instructions