Wiring to IDNet Devices

Overview

Guidelines

Up to 250 IDNet slave devices, such as smoke detectors and manual call points, can be connected to the IDNet card using Class A (loop) or Class B (line) wiring, with the following restrictions.

Class A wiring allows the devices to communicate with the IDNet card even in the event of an open circuit somewhere in the loop. Class A wiring requires that two wires are routed from the IDNet card to each IDNet device, and then back again to the IDNet card. Under AS1670.1 every group of 40 devices (or less) must be separated by a Comms Isolator.

Class B wiring allows “T” tapping, and therefore requires less wiring distance per installation than Class A. IDNet wiring does not require end-of-line resistors, because each IDNet device communicates directly to the IDNet card. A maximum of 40 devices is allowed to be connected this way.

See Appendix F for a list of compatible devices and their ratings.

•Use ferrites. See Fig 7.1.

•Shielded cable is recommended in electrically noisy environments.

•IDNet cabling should not be run adjacent to other cabling, especially non-fire system cabling, e.g. mains.

•The limiting factors of the 2 core cable connecting the IDNet devices to the IDNet Card are cable capacitance (attenuates the superimposed coms signal) and resistance (causes voltage drop of the supply voltage and comms signals).

•The maximum capacitance of 0.58uF core to core must also include the mutual capacitance of core to earth. The latter is greatly increased when shielded cable is used.

•Rather than do voltage drop calculations (see notes following), the following simplified rules are applied.

•Allow a maximum of 40Ω to any device (Class B), and in any loop (Class A) with 125 devices or less.

•Allow a maximum of 20Ω in any loop with 250 devices.

•Linear de-rating between 40Ω and 20Ω may be applied between 125 devices and

250 devices. Use RL = 20Ω x (1 + (250-n)/125) where RL is the allowable line resistance and n is the number of devices used. E.g. for 200 devices the maximum resistance allowed may be extended from 20Ω to: 20Ω + 20Ω x (250

– 200) / 125 = 28Ω

•Use the resistance specifications that apply to the cable being used. The values used in this manual allow 39Ω per km for 2 core of 1 mm2 for copper wire at

49°C. (A commonly used value is 34Ω per km for 2 core of 1 mm2 at 20°C). See Table 8.1. Note that this includes both cores.

•Sounder bases and 6 point I/O modules do not draw the alarm load from the loop, but are powered from separate 24V terminals.

•Where devices, e.g. sounder bases, are wired from a 24V source (e.g. supplied by 24V Aux Power or a NAC), and are in more than 1 zone, the power cable must also be isolated between zones by a 4090-9117AU Power Isolator Module.

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4100U specifications

The Tyco 4100 series, which includes the 4100U, 4120, and 4020 models, represents a significant evolution in fire alarm and detection systems. These systems are designed to meet the needs of commercial, industrial, and institutional environments, ensuring reliable safety and compliance with the latest regulatory standards.

One of the primary features of the Tyco 4100 series is its modular design. This allows for easy expansion and customization to meet diverse application requirements. The systems support a wide range of detectors, initiating devices, and notification appliances, providing flexibility for different building layouts and fire protection needs.

The 4100U model is particularly noted for its powerful processing capabilities, utilizing advanced digital technology to enhance the speed and accuracy of fire detection. It includes sophisticated algorithms that optimize response times and reduce false alarms, ensuring that the system is both responsive and reliable during emergencies.

The 4120 model is tailored for larger facilities, incorporating advanced networking features that enable communication between multiple control panels. This interconnectedness is crucial for managing complex building systems, allowing for centralized monitoring and control. It integrates with a variety of life-safety systems and can be configured to accommodate a vast number of addressable points, making it ideal for expansive installations.

The 4020 model serves as a cost-effective solution for smaller establishments while maintaining essential functionalities. It focuses on delivering essential fire alarm capabilities without compromising on performance. Despite its more compact design, the 4020 still offers support for numerous devices and can be integrated into larger systems if needed.

All models in the 4100 series leverage modern communication technologies, offering network integration capabilities that enhance their usability. They support various communication protocols, including Ethernet, which facilitates remote monitoring and maintenance options via web-based interfaces. This ensures that system administrators can manage alerts and notifications from anywhere, streamlining incident response.

In summary, the Tyco 4100 series, featuring the 4100U, 4120, and 4020 models, stands out for its adaptability, technological advancements, and versatility. Their robust design caters effectively to diverse environments, making them a preferred choice for fire alarm and safety solutions in various sectors. Companies can rely on these systems not only for compliance but also for enhanced safety and operational efficiency.
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