Chapter 7 Programming

Communication watchdog

Since multiple Tracer MP581s are used to interface with the mechanical equipment and FACP and FSCS panels, checking communications between each MP581 and BCU is necessary. Three different communication systems are used: BCU to MP581 (auto-bind), MP581 to MP581 (custom bind), and MP581 to EX2. The BCU cannot determine communication status of custom bindings.

One Tracer MP581 should be chosen to be the communication watchdog. Otherwise, the number of watchdog timers and Tracer MP581 permutations may exceed binding limits.

Figure 62 on page 113 illustrates the communication watchdog relationship. Figure 63 and Figure 64 on page 113 are TGP examples of the transmitting and receiving units, respectively. From the point of view of the receiving MP581, this technique tests whether the central unit can transmit by u sing a custom binding. As long as the programmer chooses to test from both ends, this process will fully test the communication status of the MP581-to-MP581 system. Other communication status such as that of the I/O bus (EX2 modules) and BMTX BCU can also be transferred to the central MP581.

The basic watchdog method consists of sending an alternating signal from one MP581 to another MP581. A custom binding is necessary for the MP581-to-MP581 communication link. Although there are many ways to bind the two devices, for this example use MP581-2/nvoswitch36 to MP581-1/nviSwitch38. Whenever nviSwitch38 goes from false to true, a retriggerable latch block is triggered, holding its output state to true When a number of stat changes are missed—typically three—an alarm event will be triggered at the BCU. It may be necessary to adjust the delay time of the latch block to avoid false communication alarms.

A response to communication status is necessary only if communication fails at any level. According to UL, a mechanical system reaction to communication loss is not necessary. Local requirements may require a mechanical reaction to communication loss.

112

BAS-APG001-EN

Page 123 Page 125
Page 124
Image 124
Trane BAS-APG001-EN, Engineered Smoke Control System for Tracer Summit manual Communication watchdog
Page 123 Page 125

BAS-APG001-EN, Engineered Smoke Control System for Tracer Summit specifications

The Trane Engineered Smoke Control System is an advanced solution designed to enhance safety and efficiency in buildings by effectively managing smoke during emergency situations. Specifically tailored for integration with the Tracer Summit Building Automation System, the Trane Engineered Smoke Control System (BAS-APG001-EN) combines cutting-edge technologies with user-friendly features, empowering facility managers to maintain optimal air quality and ensure occupant safety.

One of the standout features of the system is its programmable logic capabilities, which allow for customized smoke management strategies based on building layout and operations. This flexibility ensures that smoke is effectively controlled, providing clear egress paths for occupants while maintaining a safe environment for emergency responders. The system is engineered to operate seamlessly with other building systems, including HVAC and fire alarm systems, enabling a cohesive response during smoke events.

The Trane Engineered Smoke Control System employs sophisticated detection technologies that monitor air quality and detect smoke in real-time. This proactive approach facilitates early intervention, allowing for rapid activation of smoke control measures. Additionally, the integration of variable speed fans ensures that smoke is moved efficiently out of critical areas, reducing the risk of smoke inhalation for building occupants.

One of the key characteristics of this system is its ability to provide reliable, redundant operation. With engineered backup systems in place, the reliability of smoke control measures is significantly enhanced, ensuring that they will function correctly even in the event of a power failure. This is especially critical in high-rise buildings or complex structures, where smoke control is vital to occupant safety.

User interface features included in the Tracer Summit system offer intuitive controls and monitoring capabilities, simplifying the management of smoke control operations. Facility managers can easily view system status, receive alerts, and make necessary adjustments through the user-friendly dashboard, enhancing operational efficiency.

The Trane Engineered Smoke Control System stands out as a premier solution for smoke management in contemporary building designs. By integrating sophisticated detection technologies, programmable logic, and reliable operation, it provides an essential layer of safety in creating environments that prioritize occupant protection. As buildings continue to evolve, Trane’s commitment to innovation ensures that its Engineered Smoke Control System remains a key component in modern fire safety infrastructure.
Top Page Image Contents