BACnet vs. Lonworks Specifications (Network Guide)

Transcription

1 Connections IP, MS/TP, Ethernet TCP/IP with Fox connections Topology BACnet p Lon pp Termination Requirements BACnet pp Lon pp Cable Requirements BACnet p. 16 Lon p. 41 Daisy chain (Bus) Spur/ring/backbone and star topologies are UNSUPPORTED. Bus topology: First and last device on the bus must have EOL termination resistors (120 ohms) connected across the 2 data lines/wires of the twisted pair. (See Network Guide, CH 2, p. 17) Shielded twisted pair 24 AWG gauge TP/FT10 (recommended) (TP = twisted pair, FT = free topology) Free (Ring, Star, Loop, Combo) Free Topology: One EOL anywhere on the segment Unshielded twisted pair* Type 1 Cable: 22 AWG gauge Type 2 Cable: 16 AWG gauge * Use shielded twisted pair for networks or portions of networks that are run OUTSIDE buildings. Wiring Length BACnet p. 16 Lon p. 42 1,220 meters (4,000 ft) TYPE 1 CABLE Bus topology: 1,400 meters (4,593 ft) Free Topology: 500 meters (1,640 ft) TYPE 2 CABLE Bus topology: 2,700 meters (8,858 ft) Free Topology: 500 meters (1,640 ft) Distech Controls, Inc. Copyright 2013 July 31,

2 Extending the Data Bus BACnet pp Lon p. 43 Device Limits (Per Segment) (Per Network) BACnet p. 14 Lon p. 41 Max Nodes BACnet p. 14 Lon p. 41 Using a Repeater: No more than 2 repeaters > up to 3,660 m (12,000 ft) for the entire network 3 segments of 4,000 ft each Using an EC-BOS: Up to 5 MS/TP networks when equipped with 2 optional MS/TP network cards + installed RS-485 port (This depends on the MS/TP Feature limitation in the license.) Could have up to 50 x 5 cards = 250 devices/bos Up to 255 max up to 128 (0 to 127) are Masters up to 128 (128 to 255) are Slaves 50 max (recommended) if all Distech controllers when using DC devices exclusively 250 when equipped with 2 optional MS/TP network cards + RS485 conn on the EC-BOS side (assuming you are licensed for them) A single repeater may be used to extend the network, effectively doubling the max number of devices from 64 to 128 (repeater counts as 1 device). Type 1 Cable: Extendible up to 2,800 meters (9,186 ft) Bus or 1,000 meters (3,280 ft) Free Type 2 Cable: Extendible up to 5,400 meters (17,716 ft) Bus or 1,000 meters (3,280 ft) Free Router recommended for best performance. Using an EC-BOS: Up to 2 Lon option cards Could have up to 256 devices/bos (128 x 2 option cards) on a fully extended network. 64 nodes (including Lon card) (128 when router or repeater is used) 32,385 (255 segments) 64 (128) Distech Controls, Inc. Copyright 2013 July 31,

3 Polarity Sensitive BACnet pp. 12, 35 Lon p. 46 Addressing BACnet pp Lon N/A YES Maintain consistent polarity when connecting controllers/devices to the power transformer. MAC Address (avoid gaps in addressing) bus master (EC-BOS) 1, 2 temp commissioning, reserved Master range 128 to 254 Slave range broadcast NO Subnet/Node (no conflicts allowed) Program ID: Each device type is assigned a Program ID that identifies the vendor, usage, format and controller model type Neuron ID: Each individual controller is assigned a unique identifier For certain ECB controllers (e.g., ECB-203), MAC address must be set using an EC Smart Vue. Dip switches take precedence over Smart Vue settings. When using the EC-Smart-Vue, the dip switches must be set to default positions (see p. 29). Device Instance Number: 0 to 4,194,303* Vendor # + Network # + MAC Address Example Device IDs = , , etc. * Based on all 22 bits of the object ID set to 1. Network Number Max Master (EC-BOS) 1 to 65,534 Initially 127 After device discovery eliminate gaps in the address range, reserving 3 to 5 more for spares. Distech Controls, Inc. Copyright 2013 July 31,

4 Max Info Frames: EC-BOS 20 Max Info Frames: VAV/ECB Max Info Frames: Stat 5 Power Requirements BACnet pp Lon pp V COM terminal used as the required signal reference point for the data bus. The 24V COM/C terminals of all devices must be connected to the power supply bus that is grounded. DO NOT use a mechanical ground. DO NOT use MSTP to connect BETWEEN buildings. Avoid ground lift: excess voltage that develops over a long run of cable connecting too many devices. If the ground lift is > 7 volts peak, there is risk of data corruption and offline events due to the device being incapable of correctly reading data signals from the data bus. See below. Transformer Selection: Use transformers of 100VA or less to power devices. Calculate power requirements of all devices + external loads: multiply total power by 1.3 choose a power transformer just over this amount. Always use a SEPARATE transformer for EACH ECB-/ECL-series controller and for EACH I//O extension. External Loads: When calculating a controller s power consumption, you must also add the external loads the controller will drive, including any connected subnet modules such as EC-Smart-Vues. (See p. 50 for the total number of EC-Smart-Vue controllers are supported by a given controller model. VAV Device Max Number: Depends on wire gauge and power run total cable length Distech Controls, Inc. Copyright 2013 July 31,

5 Grounding Practices BACnet p. 20 Lon p. 44 Data Rates BACnet pp Lon p. 41 Cable shield must be twisted together and isolated with electrical tape at each device. Shield on each network segment must be connected to electrical system ground at one only > at the Bus Master (EC-BOS). Grounding in more than one location could reduce shield effectiveness. 9600, 19200, (Distech recommends), baud Master device sets the baud rate; all other devices set to AUTO. Distech recommends 38.4 baud for its controllers. Use shielded twisted pair for networks or portions of networks that are run OUTSIDE buildings, since it will be subjected to EMI. The cable shield should be grounded using a capacitor to tie the shield to earth ground and large value resistor should be used to bleed off any static charge on shield. 78 kbps (raw bit rate) 144/168 packets per second 180/210 packets per second MAX (peak traffic) Troubleshooting Issues BACnet pp Lon pp (For BACnet, see CH5 for solutions and a complete list of issues.) (For Lon, see CH6 for solutions and a complete list of issues.) SYMPTOM POSSIBLE CAUSE SYMPTOM POSSIBLE CAUSE Device doesn t communicate on the MSTP network Power supply requirements Polarity reversed More than one device with same MAC address or Device ID Baud rate is set to AUTO for ALL devices Device is set to MAC address outside of range Max # of devices exceeded Incorrect Max Master Gaps in the MAC addressing scheme EOL resistors missing Supply voltage, overloaded transformer, or wiring issue Inter-building comm attempted using MSTP w/o first configuring BBMD Service on each MSTP network to allow messages to be sent on IP via an IP router Device doesn t communicate on the Lon network Power supply requirements Max # of devices on a network segment exceeded (64) Absent or incorrect voltage Overloaded power transformer Network not wired correctly Absent/incorrect network termination Supply voltage, overloaded transformer, or wiring issue Too many EC-Smart-Vue devices providing network access (global/local values) Distech Controls, Inc. Copyright 2013 July 31,

6 Controller communicates well over short network, but not over a large network HW input not reading correct value HW output not operating correctly Wireless devices not working correctly RX LED not blinking TX LED not blinking STATUS LED blinking Wrong wire type Network wiring problem EOL resistors missing/incorrect Max # of devices exceeded Incorrect Max Master Open/short circuit Over-voltage/current at an input Blown fuse Output wiring problem Polarity of 24VAC power supply connected to actuator Device not associated to controller Controller communicates well over short network, but not over a large network HW input not reading correct value HW output not operating correctly Power discharge Device too far from receiver/obstructions in line of signal Data not being received on bus Data not being sent on bus See pp of Network Guide STATUS LED blinking Network length exceeds specs Wrong wire type Network wiring problem EOL resistors missing/incorrect Max # of devices on a network segment exceeded (64) Extra capacitance Network traffic Open/short circuit Over-voltage/current at an input Input wiring problem Output wiring problem Blown fuse Polarity of 24VAC power supply connected to actuator See pp of Network Guide Distech Controls, Inc. Copyright 2013 July 31,

7 BEFORE CALLING TECH SUPPORT Before calling Technical Support, verify the following recommendations have been carried out: Properly terminated MSTP data bus. At least one device set to recommended baud rate with the remainder set to AUTO. Ensure that polarity of all data bus wiring is correct and consistent. Do not overload the data bus with COV reporting, since these contribute to the most amount of network traffic. Ensure there are no gaps in MAC addresses, and that the Max Master is set to the last MAC address # on the network, perhaps allowing several spaces for expansion. ONLY daisy-chained devices DO NOT use T-taps or star configurations. Connect no more than 5 devices to a power supply transformer. Before calling Technical Support, verify the following recommendations have been carried out: Properly terminate the Lonworks data bus. Connect no more than 5 devices to a power supply transformer. Distech Controls, Inc. Copyright 2013 July 31,

8 Pros/Cons Pros: Cons: Usually cheaper and easier to install (MSTP) Less complex protocol More aggressively marketed and supported Niagara (AX) objects are modeled after Bacnet objects Polarity sensitive More extensive initial setup (e.g., network #, MAC address, device ID, baud rate) Must be tweaked to achieve optimal performance More aggressively marketed Pros: Generally more stable and forgiving In a bus topology, greater allowed cable length (8,858 ft vs. 4,000 ft) Minimal initial setup Cons: Steeper learning curve More complex protocol/rules Usually greater initial cost (installation) LOTS of vendor-/model-specific modules Distech Controls, Inc. Copyright 2013 July 31,