Honeywell TB7600 User Manual

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BACnet Integration Manual for

TB7600 Series

Thermostat

TB7600 Series

Thermostat with

Occupancy Sensor

TB7600 Series Thermostats

REFERENCE MANUAL

The TB7600 thermostats are also compatible with the Honeywell PIR occupancy sensor covers. Thermostats equipped with a PIR cover provide advanced active occupancy logic, which will automatically switch occupancy levels from Occupied to Unoccupied as required by local activity being present or not. This advanced occupancy functionality provides advantageous energy savings during occupied hours without sacrificing occupant comfort. All thermostats can be ordered with or without a factory installed PIR cover.

More Information

The additional following documentation is available on http:// customer.honeywell.com:

• TB7600 Series Installation Instructions (form number 62-

2016).

• TB7600 Series with Humidity Control Installation Instructions (form number 62-2017).

• The PIR Application Guide for TB7600 Series (form

PRODUCT OVERVIEW

number 63-4525).

The TB7600 PI thermostat family is specifically designed for single stage and multi-stage control of heating/cooling equipment such as rooftop and self-contained units. The TB7600 Series are communicating thermostats with models available in BACnet protocols and can be easily integrated into a WEBs-AX building automation system based on the NiagaraAX® platform.The product features an intuitive, menu-driven, backlit LCD display, which walks users through the programming steps, making the process extremely simple. Accurate temperature control is achieved due to the product’s PI time proportional control algorithm, which virtually eliminates temperature offset associated with traditional, differentialbased thermostats.

MS/TP and ZigBee® wireless mesh

Contents

Product Overview ............................................................. 1

Compatibility ..................................................................... 2

Tips and Things You Need to Know .................................. 2

Wiring guidelines .............................................................. 3

Network Configuration ...................................................... 4

Network Adapter ............................................................... 6

Integration ......................................................................... 7

Troubleshooting ................................................................11

Appendix ...........................................................................12

TB7600 Series Protocol Implementation

Conformance Statement (PICS) ..................................12

BACnet Objects Supported ...............................................13

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BACNET INTEGRATION MANUAL FOR TB7600 SERIES THERMOSTATS

COMPATIBILITY

Honeywell TB7600 Series thermostat compatiblity information is provided in Table 1.

Table 1. TB7600 Thermostat Compatibility Information

WEBs-AX Controller Thermostats Per Controller* WEBStation-AX

WEB-2xx 126 3.0 or later

WEB-6xx 126 3.0 or later

WEB-7xx 126 3.5

* 128 total devices supported. One node used by controller and one for a repeater. A repeater is required if more than 64 devices

are on a bus.

TIPS AND THINGS YOU NEED TO KNOW

• Each TB7600 Series thermostat is delivered from the factory with the default MAC address set at 254 (referred to as the Com

Addr in the parameters at the thermostat). At this value, BACnet communication is NOT active and the device will not participate in the token pass either. The local LED status for the communication adapter at this point is one short flash only. To enable BACnet communication, set the local MAC address configuration property of the thermostat to any valid value from 0 to 127.

• After the initial configuration of your device and if your BAS allows you to remove objects, we suggest that you remove all the configuration objects to prevent unnecessary polling of unused objects and to help speed up the network.

• All configuration objects are available and accessible locally from the device itself using the local configuration routine. Please refer to the TB7600 Series (form number 62-2016) or TB7600 Series with Humidity Control (form number 62-2017) installation instructions for details.

• In its default mode of operation, the device will automatically match its baud rate to the baud rate of the network. Automatic baud rate detection will occur when the MS/TP communication port is initialized (on power up). If the network speed is changed, the device will keep listening at the previously detected speed for 10 minutes before resuming auto-bauding. Repowering the devices will force right away auto-bauding.

• If the device should go off-line, the following binded thermostat parameters will be released:

• Room Temperature

• Outdoor Temperature

• Occupancy

• The BACnet Data Link layer has two key parameters: the device object name and the device object ID. The device object name must be unique from any other BACnet device object name on the BACnet network (i.e. not just the MS/TP subnetwork). The device object ID must be unique from any other BACnet device object ID on the entire BACnet network (i.e. not just the MS/TP sub-network).

• On models with scheduling, time synchronization can be made through a network even if the thermostat does not support the full date. Therefore, the device cannot claim conformance to the DeviceManagement – TimeSynchronization - B (DM-TS-B) service. The device object does not have the Local_Time or Local_Date properties.

• Programmable models (with scheduling) are intending for stand-alone applications where the thermostat may be added to the network at a later time. Once a programmable thermostat is added to a network all schedule must be done through the Workbench. Local control of network settings is not supported. To hide the scheduling option from the local thermostat use one of the BIs and set to Rem NSB if a BI is not being used.

• Device Name and Device ID properties are writable in Honeywell device object. Both properties can be renamed from any BACnet network management tool as long as the tool itself gives access to write to these properties.

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BACNET INTEGRATION MANUAL FOR TB7600 SERIES THERMOSTATS

WIRING GUIDELINES

Overview

Honeywell uses EIA-485 as the physical layer between their devices and supervisory controllers

For clarity we will use the term “Device” to represent any product with an active EIA-485 network connection, including Honeywell and non-Honeywell thermostats.

Table 2. Summary of Specifications for a Honeywell EIA-485 Network

Parameter Details

Media Twisted pair 22AWG-24 AWG, shielded recommended

Characteristic Impedance 100-130 ohms

Distributed capacitance Less than 100 pF per meter (30 pF per foot)

Maximum length per segment 1200 meters (4000 feet)

Polarity Polarity sensitive

Multi-drop Daisy-chain (no T connections)

Terminations TB7600, TB7300, and/or TB7200 Series thermostats are

installed at both ends of the MS/TP network: 120 Ohms resistor

should be installed at each end. To reduce issues with other BACnet devices we recommended keeping like devices on the same bus. TB7600, TB7300 and TB7200 Series thermostats can be installed on the same bus.

1. A TB7600, TB7300, or TB7200 device is installed at one end of the MS/TP network and another device is installed at the other end:

Install an End-Of-Line resistor value that matches the other device's instructions regarding the End-Of-Line resistors

2. Other devices are installed at both ends of the MS/TP network:

Follow the other device’s instructions regarding the End-Of-Line resistors.

Maximum number of nodes per segment 64 (Honeywell devices only)

Maximum number of nodes per network 128

Baud rate 9600, 19200, 38400, 76800 (Auto detect)

Cable Type

Honeywell recommends the use of balanced 22-24 AWG twisted pair with a characteristic impedance of 100-130 ohms, capacitance of 30 pF/ft or lower. A braided shield is also recommended.

Impedance

A value based on the inherent conductance, resistance, capacitance and inductance that represent the impedance of an infinitely long cable. The nominal impedance of the cable should be between 100Ωand 120Ω. However using120Ω will result in a lighter load on the network.

Capacitance (pF/ft)

The amount of equivalent capacitive load of the cable, typically listed in a per foot basis. One of the factors limiting total cable length is the capacitive load. Systems with long lengths benefit from using low capacitance cable (i.e. 17pF/ft or lower).

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BACNET INTEGRATION MANUAL FOR TB7600 SERIES THERMOSTATS

M32571

DAISY CHAIN

CONFIGURATION

BUS CONFIGURATION

STAR CONFIGURATION

EOL

NODE 2

NODE 3

NODE 4

NODE 5

EOL

NODE 1

END OF LINE RESISTOR DOES NOT COUNT AS A NODE

M32572

LEGEND

EOL: END OF LINE RESISTOR SC: SUPERVISORY CONTROLLER

NETWORK CONFIGURATION

EIA-485 networks use a daisy chain configuration. A daisy chain means that there is only one main cable and every network device is connected directly along its path.

Fig. 1 illustrates two improper network configurations and the proper daisy chain configuration.

Other methods of wiring an EIA-485 network may give unreliable and unpredictable results. There are no troubleshooting methods for these types of networks. Therefore, a great deal of site experimentation may have to be done, making this a difficult task with no guarantee of success. Honeywell will only support daisy chain configurations.

Fig. 1. Three different network configurations: star, bus, and daisy chain.

Only the daisy chain configuration is correct for an EIA-485 network.

Maximum Number of Devices

A maximum of 64 nodes is allowed on a single daisy chain segment. A node is defined as any device (controller, thermostat, repeater) connected to the RS485 network. Terminators do not count as a node.

NOTE: Biasing is not required with this series of devices.

To determine the number of nodes on a network, add the following:

• One node for each device, including controller

• One node for each repeater on the chain

For the example in Fig. 2, we have one node for the controller, plus 4 for the thermostats, for a total of 5 nodes.

If you have more than 64 devices, then repeaters are required to extend the network.

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Fig. 2. Five nodes network example.

BACNET INTEGRATION MANUAL FOR TB7600 SERIES THERMOSTATS

EOL

M32573

LEGEND

EOL: END OF LINE RESISTOR R: RS485 REPEATER SC: SUPERVISORY CONTROLLER

EOL

EOLEOL

EOL

Maximum Cable Length

The maximum length of a chain is related to its transmission speed. The longer the chain, the slower the speed. Using proper cable, the maximum length of an EIA-485 daisy chain is 4000-ft (1200 m). This will only work reliably for data rates up to 100,000 bps. TB7600 themostats' maximum data rate is 76,800 bps.

If you require a maximum network length of more than 4000 feet, then repeaters are required to extend the network.

EIA-485 Repeaters

If you have more than 64 devices, or require a maximum network length of more than 4000 feet, repeaters are required to extend the network. The BASRT-B repeater by Contemporary Controls can be used if a repeater is needed. The best configuration is to daisy chain the repeaters to the controller. From each of these repeaters, a separate daisy chain will branch off. Fig. 3 demonstrates a valid use of repeaters in an EIA-485 network.

Do not install repeaters in series, as this may result in network reliability problems. Fig. 4 demonstrates an incorrect use of a repeater in an EIA-485 network.

Fig. 3. Correct usage – repeaters are daisy-chained to the supervisory

controller and separate daisy chains branch from each repeater.

EOL

M32574

DO NOT ADD SECOND REPEATER IN SERIES

EOL

LEGEND

EOL: END OF LINE RESISTOR R: RS485 REPEATER SC: SUPERVISORY CONTROLLER

Fig. 4. Incorrect usage – the second repeater in series may result in an unreliable system.

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End Of Line (EOL) Resistors

MS/TP network must be properly terminated. For daisy chain configurations, you must install an EOL resistor at each end of the daisy chain. Depending on your MS/TP network configuration, the resistance value of the EOL resistor may change:

• TB7600, TB7300, and/or TB7200 thermostats are installed at both ends of the MS/TP network: 120 Ohms resistor should be installed at each end.

• A TB7600, TB7300, or TB7200 device is installed at one end of the MS/TP network and another device is installed at

the other end:

Install an End-Of-Line resistor value that matches the other device’s instructions regarding its EOL resistor value;

• Other devices are installed at both ends of the MS/TP network:

Follow the other device’s instructions regarding its EOL resistor value.

NETWORK ADAPTER

The polarity of the connection to the cable is important. From one module to the other it is important that the same color wire be connected to “plus” or “+” and the other color wire be connected to the “minus” or ”-“. Fig. 5 shows the proper MS/TP connections and the location of the Status LED. This Status LED may help to troubleshoot network problems.

Fig. 5. Correct MS/TP connections and location of a Status LED on a BACnet module

IMPORTANT NOTE: The Ref terminal should NEVER be used to wire shields. The 2 shields from each feed of the network

connection to a thermostat should be wired together in the back of the thermostat and properly protected to prevent any accidental connection to the ground.

The joined shield connection should then be grounded at a SINGLE point on the whole segment. More than one ground connection to a shielded wire may induce ground loop noises and affect communication.

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BACNET INTEGRATION MANUAL FOR TB7600 SERIES THERMOSTATS

GLOBAL COMMAND CONTROL LEVEL

DEVICE LEVEL

BAS FRONT-END

TB7600 SERIES TSTAT

MSTP NETWORK

GLOBAL COMMANDS ALL DEVICES (ALL THERMOSTATS)

OUTDOOR TEMPERATURE

OUTDOOR TEMPERATURE AND HVAC PLANT CURRENT MODE

BAS CURRENT ENERGY SAVINGS MODE

GLOBAL COMMANDS SPECIFIC DEVICES (SPECIFIC AREA THERMOSTATS)

SCHEDULE

SCHEDULE AND OUTDOOR TEMPERATURE

RESTRICT SER ACCESS TO THERMOSTAT

ROOM TEMPERATURE FOR TESTING AND OVERRIDE

OUTDOOR TEMPERATURE (AV9) SYSTEM MODE (MV13) FAN MODE (MV15)

OCCUPANCY COMMAND (MV12) OCCUPIED HEATING SETPOINT (AV42) UNOCCUPIED HEATING SETPOINT (AV44) OCCUPIED COOLING SETPOINT (AV43) UNOCCUPIED COOLING SETPOINT (AV45) KEYPAD LOCKOUT (MV18)

ROOM TEMPERATURE (AV7)

M32570

Network Adapter Status LED

Table 3 shows the different possibilities with the Status LED behavior of the BACnet module.

Table 3. Status LED condition and possible solutions

Condition of the Status LED Possible Cause Solution

BACnet communication NOT active at default MAC address = 254

Change MAC address to another value from 0 to 127

1 short blink

2 short blinks (no wires connected to the module)

The BACnet module is recognized on the thermostat and has been installed

N/A

on the right thermostat model

2 short blinks (wires connected to the module)

2 short blinks and a longer blink (wires connected to the module)

Right after power is applied: 2 long blinks and then no blinking

Module is not at the same baud rate as the network

The module has detected the presence of a network

Polarity has been reversed at the module

Power off and on the thermostat

N/A

Reverse polarity at the module

INTEGRATION

This section provides compatibility and programming information useful when setting up TB7600 Series thermostats on a WEBsAX building automation system.

Global Commands

The following figure shows which objects from the thermostat can be monitored and commanded from the BAS front-end.

Fig. 6. Global commands from a BAS front-end to a TB7600 series thermostat.

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Typical Graphical User Interface (GUI) Objects

The following objects should be typically used in a GUI:

• Room Temperature (AV7);

• Occupied and Unoccupied Heat Setpoints (AV 42 and AV44);

• Occupied and Unoccupied Cool Setpoints (AV 43 and AV45);

• Outdoor Temperature (AV9);

• Supply Temperature (AI16) (If available);

• Occupancy Command (MV12);

• Effective Occupancy (MV34);

• System Mode RTU (MV14) or System Mode HPU (MV13);

•G Fan (BI25);

• Y1 Cool (BI26);

• Y2 Cool (BI27);

• W1 Heat (BI28);

• W2 Heat (BI29) or Reversing Valve (BI30);

• Economizer Output (AV22) (if available);

• Aux (BI24);

• DI 1 Status (BI31);

• DI 2 Status (BI 32);

• Frost Alarm (BI36) (if available);

• Filter Alarm (BI38) (if available);

• Service Alarm (BI39) (if available);

• Fan Lock Alarm (BI40) (if available)

Fig. 7. Typical GUI for a TB7605B5014B with Economizer control.

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