Concept
EcoStruxure BMS Smoke Control for BACnet MS/TP
The EcoStruxure smoke control system supports the MP-X and IP-IO controllers mentioned previously in this guide. For more information, see EcoStruxure BMS Smoke Control for MP-X IP Controls .
Along with those EcoStruxure system products and configuration, the smoke control system also supports the b3 and MNB family of BACnet MS/TP controllers. Both the AS-SMK and AS-P-SMK Smoke Control Servers have provided integrated support for these MS/TP controllers since the original system Smoke Control listing. All of these controllers continue to communicate directly with the AS-SMK or AS-P-SMK to which they are connected regardless of the introduction of the IP level controllers described previously. The system engineer has the ability to pass BACnet variables between the IP level and MS/TP level controllers as needed using the standard variable binding and application program features common to both families.
The EcoStruxure BMS smoke control system is constructed with two primary networking tiers. At the top is the IP network which interconnects all the Smoke Control Servers, MP-X IP controllers, Workstation(s) and optional other Enterprise and Report Servers. The EcoStruxure BMS provides a second tier of communications networks that connect below the AS-SMK and AS-P-SMK Smoke Control Servers. Up to two RS-485 token passing BACnet MS/TP networks are supported from each Automation Server or AS-P via Channel-A and Channel-B. Each of the two BACnet network ports support up to 127 MS/TP field controllers.
Either of the two RS-485 channels (A or B) on the Smoke Control Servers can be configured for the following:
BACnet MS/TP field bus (as discussed in this section)
Infinet (i2) field bus (AS-P-SMK only)
Modbus protocol interface (for the FSCS)
In a smoke control system, one Smoke Control Server will be assigned to manage the FSCS using one of the two RS-485 ports on that Smoke Control Server. The port will be configured for the Modbus protocol to communicate with the FSCS panel. For more information, see FSCS Basics .
The following figure presents a simple diagram of the two tier architecture. It does not show the MP-X IP level controls described previously in the guide. The MP-X controllers can optionally be applied in any of the system configurations described in the document
When using a UL 864 listed fire alarm panel (FAP) with an IP network interface, the FAP resides on the IP network and sends alarm information via BACnet/IP to the Smoke Control Server acting as the FAP manager (AS-SMK 1 or AS-P-SMK in the figure). The same Automation Server or AS-P may also manage the FSCS panel through the Modbus channel. The BACnet/IP connection is supervised from the Smoke Control Server (AS-SMK 1 or AS-P-SMK 1). The Modbus connection is supervised from the FSCS. The two other Automation Servers show the second MS/TP network tier of the system with two BACnet MS/TP buses extending down from AS-SMK 2 (AS-P-SMK 2) and AS-SMK 3 (AS-P-SMK 3). These buses connect to the family of field controllers (b3 and MNB Series) listed in this guide. For more information, see MS/TP BACnet Field Controllers .
With Ethernet networks, you cannot achieve the interconnection between the Automations Servers, AS-Ps, FAP and Workstations without additional Ethernet communications equipment. In a smoke control system, the communications required to execute the applications can only pass through equipment included within the UL 864 system listing. To support the IP network with smoke control systems, the EIS series Ethernet switch products discussed in this guide are approved to interconnect the smoke control IP products. For more information, see MS/TP Network Accessories .
The following diagram presents a collection of these system elements:
EIS Series Ethernet Switch
Fiber optic models allow operation through extended distances with EMI immunity. The 8 port copper only versions can be used with smaller networks
Automation Server 1 (AS-SMK 1), or AS-P 1 (AS-P-SMK 1) manages and supervises the BACnet/IP connection to the Fire Alarm Panel
Automation Server 1 (AS-SMK 1), or AS-P 1 (AS-P-SMK 1) manages the Modbus connection to the FSCS panel
Automation Server 2 (AS-SMK 2), or AS-P 2 (AS-P-SMK 2) manages two MS/TP channels of b3 field controllers and provides a collection of I/O modules. The 10 fully configured models are listed. All of the models ending with H are available without the H providing the same I/O without the manual override Hand-Off-Auto control on the front.
Automation Server 3 (AS-SMK 3), or AS-P 3 (AS-P-SMK 3) manages two MS/TP channels of MNB and b3 field controllers
Field Controllers Buses lists all BACnet MS/TP models approved for the EcoStruxure BMS smoke control application
The BACnet MS/TP bus serving the controllers performing smoke control must not be connected directly with any non-UUKL listed products. When non-UUKL products need to be connected with the MS/TP network for general purpose HVAC comfort control application, one of the following two options can be used:
Connect the non-UUKL product to a separate/isolated MS/TP channel on a Smoke Control Server. For example, the B channel port on a Smoke Control Server could be used to connect non-UUKL products while the A channel is used with the b3 and MNB series products performing smoke control applications.
Connect a b-Link Repeater to any MS/TP channels from the Smoke Control Servers and connect the non-UUKL products on one of the separate ports on the b-Link. That port used to service non-UUKL product must not be used for connecting to any controller participating in the smoke control application. Additionally, when there is a tiered structure with additional b-Link Repeater(s) connected downstream on segment(s) from the initial b-Link Repeater, the segment(s) connecting between b-Link Repeaters must not be connected to any non-UUKL products.
In the following figure, Automation Server (AS-SMK 1), or AS-P (AS-P-SMK 1) shows an example of using the two ports to isolate non-UUKL products, while Automation Server (AS-SMK 2), or AS-P (AS-P-SMK 2) shows the application of a b-Link Repeater to segment and isolate an MS/TP bus. The b-Link provided bus segments can be used for UUKL products or non-UUKL products, but both must not be mixed on the same copper segment.
The MS/TP bus operates at serial data transmission rates of 9600, 19200, 38400, or 76800 bps. Most system installations are installed using 76,800bps. In some installations, however, it may be necessary to lower the speed to 38,400 bps due to the effect of cable characteristics, cable length or node count.
The following figure presents an example smoke control system configuration used to develop the application programs for UL 864 system testing and evaluations. The system is presented here simply as a reference associated with features, requirements, and restrictions that must be observed when configuring a compliant smoke control system.
The controllers and other products comprising the example are all represented with boxes. The product model number is shown in blue text. The magenta text lists the smoke control equipment references in the example smoke control application. A number of application programs based on this sample system configuration are provided elsewhere in the smoke control system design guide. For more information, see Basic Application Functions .
Smoke Control Operational Overview
Basic Application Functions
EcoStruxure BMS Smoke Control for MP-X IP Controls
MS/TP BACnet Field Controllers
MS/TP Network Accessories
FSCS Basics