Magnitude Chiller Unit Controller BACnet Communication Module (MS/TP, IP, Ethernet)

Magnitude Chiller Unit Controller BACnet Communication Module (MS/TP, IP, Ethernet)

Integration

Introduction

Once the BACnet Communication Module has been properly installed on the unit controller, it is then possible to integrate the unit controller into a building automation system (BAS) via the BACnet network. The addressing and configuration process is described separately for each protocol

(BACnet MS/TP, BACnet IP, and BACnet Ethernet) in the following sections.

The BACnet Communication Module can be configured using the Magnitude chiller unit controller

Operator Interface Touch Screen (OITS) display. The unit is ready to operate after you have configured the parameter values of the unit controller for your particular network. Refer to the

Magnitude Chiller Operation and Maintenance Manual (OM 1034) for default values and unit controller OITS operating instructions. Refer to McQuay Protocol Document ED 15117 for descriptions of all the available BACnet parameters.

Figures 3 and 4 show the chiller unit controller OITS display screens with the corresponding network parameters available for configuration. These two screens (titled BAS1 and BAS2) are accessed by pressing the BAS button at the top of the column on the right-hand side of the main unit controller

OITS display.

Note:

Refer to the Magnitude Chiller Operation and Maintenance Manual (OM 1034) for details regarding accessing and using the unit controller OITS display.

BACnet MS/TP Addressing

The BACnet MS/TP Media Access Control (MAC) address is a one-octet address that must be set during the BACnet Communication Module configuration. The MAC address must be unique to the

MS/TP network and have a valid range of 0-127.

Additionally, there are certain parameters that must be set properly to verify communication between

Magnitude Chiller Unit Controller and the MS/TP network. Table 3 provides details about these addressing parameters. See your system integrator for additional information regarding proper

BACnet MS/TP addressing.

BACnet MS/TP Configuration

1. Open the Magnitude chiller unit controller OITS display screen.

2. Press the SET button, located at the bottom of the screen.

3. Press the BAS button from the top of the column on the right-hand side of the screen.

4. Press the 1 button, located to the right of the BAS Network Protocol field. The BAS Network

Protocol field should now be highlighted (see Figure 3).

5. Press the Change button.

6. If prompted, enter the password 100 and press Enter. Otherwise, proceed to step 7.

7. Press the Change button.

8. Select BACnet MSTP from the drop-down menu.

9. Press the Enter button.

10. Press the BAS button to access the second BAS screen (BAS2).

11. Set the BACnet MS/TP – MAC Address within the valid range of 0-127.

12. Verify the baud rate of the unit controller (see next section, Changing the BACnet Data

Transmission Rate, for details).

13. Modify the remaining BACnet parameters as necessary. See Table 3 for a complete list.

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14. Cycle power to the unit controller.

Changing the BACnet MS/TP Data Transmission Rate

The options for baud rate (in bps) include: 9600, 19200, 38400, 76800. The factory default baud rate is 38400 bps. Follow the steps below to change the baud rate for desired network speed via the

OITS display:

1. If you are at the BAS2 screen, proceed to Step 4 (see Figure 4).

2. If you are on the BAS1 screen, press the BAS button and proceed to Step 4.

3. From any other screen, press the SET button once and then press the BAS button twice.

4. Press the 5 button, located to the right of the BACnet MS/TP - Baud Rate field. The

BACnet MS/TP - Baud Rate field should now be highlighted.

5. Press the Change button.

6. If prompted, enter the password 100 and press Enter. Otherwise, proceed to step 7.

7. Press the Change button.

8. Press the desired baud rate from the drop-down menu.

9. Press the Enter button. The new baud rate will take effect in approximately 60 seconds.

BACnet MS/TP Configurable Parameters

Table 3 defines the BACnet Communication Module network parameters that are configurable via the unit controller OITS display. Additional parameters are also configurable from the Building

Automation System (BAS). For a complete list of available BACnet points, refer to the Magnitude

Chiller Unit Controller Protocol Document, ED15117 (available on www.mcquay.com).

The following parameters are all read from the unit controller during the communication module’s initialization phase. If any parameter in Table 3 (except BAS Network Protocol and English/Metric) is changed at via the unit controller OITS display during run-time, the update is automatically applied to the BACnet communication module as soon as the change is received. Change parameters as required for your network.

At a minimum, you must set the following before establishing network communication between the unit controller and the BAS:

1. BAS Network Protocol

2. Device Instance

3. MAC Address

4. Verify the correct baud rate and change if necessary

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Table 3. BACnet MS/TP Configuration Parameters

BAS Network Protocol

Device Instance

MAC Address

Object Name

1

BACnet MSTP/This point sets the desired network protocol.

0-4194302/Device Instance of the

BACnet communication module.

None/Set this value to BACnet

MS/TP. The unit controller must be reset after changing this parameter.

3000/This must be unique throughout the entire BACnet network. If a value greater than 4194302 is read from the controller, the following default value will be used: 3000 + address.

Address = the last two octets of the

MAC Address.

1/ Each device on the BACnet network must have a unique MS/TP address.

0-127/ This is the MS/TP address of the BACnet communication module.

The allowable range of characters for the device object name is 1 to

31 characters. /If an empty string is read from the controller, the initial value is used.

The device object name is visible to BACnet as the object name of the device object.

Magnitude/ This name must be unique throughout the entire BACnet network.

If an empty string is read from the controller, the BACnet communication module uses the following default:

MTE Chiller UCA-address

Where address is the MAC address.

Changing the device object name may affect the operation of other BACnet devices on the network that have previously discovered the device. The

BACnet communication module may take up to 60 seconds before this change is recognized. A power cycle is not needed.

Baud Rate

1

Max Masters

Max Info Frames

English / Metric transfer speed.

1-127/ This variable specifies the highest possible address for master. nodes and must be set to less than or equal to 127.

1-5/ This variable specifies the maximum number of information frames the BACnet communication module may send before it must pass the token.

English (0)-Metric(1)/Determines the type of units that are passed through the BACnet network.

127

5

English/To set the unit for Metric, set this variable to Metric. Cycle power to the unit controller after changing this parameter.

1

Parameter only available via the unit controller OITS display

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BACnet IP Addressing

There are key parameters of the BACnet/IP MAC layer that require configuration prior to connecting the unit controller to the BACnet network. These parameters require configuration via the chiller unit controller OITS display. They are not accessible from the BACnet network or BAS. These parameters include:

 IP Address

 Subnet Mask

 UDP Port

 Default Gateway Address

 BBMD Address

 Foreign Device Time-To-Live

There are other parameters available via the chiller unit controller OITS display (Device Instance and

Device Name, for example) that are also configurable via the BACnet network or BAS. See Table 4 for details.

Note:

Refer to the

Magnitude Chiller Operation and Maintenance Manual (OM 1034)

for details regarding accessing and using the Magnitude Chiller Unit Controller OITS display.

BACnet IP Configuration

1. Open the Magnitude chiller unit controller OITS display screen.

2. Press the SET button, located at the bottom of the screen.

3. Press the BAS button from the top of the column on the right-hand side of the screen.

4. Press the 1 button, located to the right of the BAS Network Protocol field. The BAS Network

Protocol field should now be highlighted (see Figure 3).

5. Press the Change button.

6. If prompted, enter the password 100 and press Enter. Otherwise, proceed to step 7.

7. Press the Change button.

8. Select BACnet IP from the drop-down menu.

9. Press the Enter button.

10. Press the BAS button.

11. Modify the remaining BACnet parameters as necessary. See Table 4 for a complete list.

12. Cycle power to the unit controller.

Note:

Device Instance, IP Address and Object Name must all be unique throughout the network.

BACnet IP Configurable Parameters

Table 4 defines the network parameters of the BACnet Communication Module that must be configured in order to establish communication between Magnitude Chiller Unit Controller Unit and the BACnet IP network. These parameters are set using the unit controller OITS display.

These parameters are all read from the Magnitude Chiller Unit Controller during the BACnet communication module’s initialization phase. Change parameters as required for your network.

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Table 4. BACnet/IP Parameters

Name

Value

(Range)/Definition

Initial Value/Note

BAS Network

Protocol

Device

Instance

BACnet IP/This point sets the desired network protocol.

0-4194302/Device

Instance of the BACnet

Communication Module.

Object Name The allowable range of characters for the device object name is 1 to 31 characters./If an empty string is read from the unit controller, the Initial

Value is used.

Network

Address

The device object name is visible to the BACnet network as the object name of the device object.

IP Address of the

BACnet

Communication

Module

None/Set this value to BACnet IP. Cycle power to the unit controller after changing this parameter.

3000/This must be unique throughout the entire BACnet network. If a value greater than 4194302 is read from the unit controller, the following default value is used:

3000 + address.

Where address is the last two octets of the MAC address.

Magnitude/ This name must be unique throughout the entire

BACnet network. If an empty string is read from the controller, the BACnet card will use the following default:

MTE Chiller UCA-address

Where address is the Ethernet MAC address.

Changing the device object name may affect the operation of other BACnet devices on the network that have previously discovered the device. The BACnet

Communication Module takes up to 60 seconds before this change is recognized. A power cycle is not needed.

Subnet Mask

UDP Port

Subnet Mask of the

BACnet

Communication

Module

(User Datagram

Protocol) Identifies the application process in the destination unit

172.16.5.8/ If the IP address is changed via the unit controller OITS display during run-time, the update is automatically applied to the BACnet Communication

Module as soon as the change is received.

The IP address is checked for validity as an IP address and against the Subnet Mask. If the address is not valid, the

BACnet Communication Module does not enable

BACnet/IP communications. The device does not initiate or respond to BACnet messages.

If the IP address is changed at run-time and the address is not a valid IP address, the change is ignored. The existing address remains in effect.

Changing the IP address may affect the operation of other

BACnet devices on the network that may be dependent on objects within the device.

255.255.255.0/ If the Subnet Mask is changed, the update is automatically applied to the BACnet Communication

Module as soon as the change is received.

The Subnet Mask is checked for validity against the IP address. If the Subnet Mask is not valid, the BACnet

Communication Module does not enable BACnet/IP communications. The device does not initiate or respond to

BACnet messages.

If the Subnet Mask is changed at run-time and the Subnet

Mask is not a valid Subnet Mask, the change is ignored.

The existing mask remains in effect

Changing the Subnet Mask may affect the operation of other BACnet devices on the network that may be dependent on objects within the device.

47808/ If the UDP Port is changed, the update is automatically applied to the BACnet Communication

Module as soon as the change is received. Changing the

UDP Port may affect the operation of other BACnet devices on the network if they are dependent on objects within the device.

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Name

Default

Gateway

BBMD IP

Address

Foreign

Device Time

English /

Metric

Value

(Range)/Definition

Gateway address

Initial Value/Note

IP Address for the

BACnet Broadcast

Management Device

(BBMD) if used.

0-65535/ The time, in seconds, within which the foreign device must re-register with the

BBMD. If it does not re-register, the BBMD removes it from its

Foreign Device Table

(FDT) and discontinues forwarding messages to the foreign device.

English (0)-

Metric(1)/Determines the type of units that are passed through the

BACnet network.

“None”/ If the default gateway address is changed, the update is automatically applied to the BACnet

Communication Module as soon as the change is received.

Changing the default gateway address may affect the operation of other BACnet devices on the network if they are dependent on objects within the device.

“None”/ If the BBMD address is not 0, the BACnet

Communication Module sends a Register-Foreign-Device message to the address. If the result code returned is

X’0000’, the BACnet Communication Module renews the registration at the period defined by the Foreign Device

Time-To-Live value. If the BBMD address is changed, the update is automatically applied to the BACnet

Communication Module as soon as the change is received.

If the new value is 0, the existing signup is no longer refreshed and will be allowed to expire. In other words, when a BBMD IP address is defined here, a Register-

Foreign-Device message is sent to register the chiller unit controller’s IP address with the BBMD. This message is continuously sent out before the Foreign Device Time expires. If the new value is non-zero, a Register-Foreign-

Device message is sent to the BBMD address that has been defined by this parameter. Changing the BBMD address may affect the operation of other BACnet devices on the network if they are dependent on objects within the device.

0/ If the Foreign Device Time-To-Live (FDTTL) is changed, the update is automatically applied to the BACnet

Communication Module as soon as the change is received.

If the new value is different from the existing value, a

Register-Foreign-Device message is sent to the BBMD address. A minimum TTL of 15 seconds is enforced to avoid excessive network traffic.

English/To set the unit for Metric, set this variable to

Metric. Cycle power to the unit controller after changing this parameter.

BACnet Ethernet Configuration

1. Open the Magnitude chiller unit controller OITS display screen.

2. Press the SET button, located at the bottom of the screen.

3. Press the BAS button from the top of the column on the right-hand side of the screen.

4. Press the 1 button, located to the right of the BAS Network Protocol field. The BAS

Network Protocol field should now be highlighted (see Figure 3).

5. Press the Change button.

6. If prompted, enter the password 100 and press Enter. Otherwise, proceed to step 7.

7. Press the Change button.

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8. Select BACnet Ethernet from the drop-down menu.

9. Press the Enter button.

10. Modify the remaining BACnet parameters as necessary. See Table 5 for a complete list.

11. Cycle power to the unit controller.

Note:

Device Instance and Object Name must be unique throughout the network.

BACnet Ethernet Configurable Parameters

Table 5 defines the network parameters of the BACnet Communication Module that must be configured in order to establish communication between Magnitude Chiller Unit Controller Unit and the BACnet IP network. These parameters must be set using the unit controller OITS display. The

BACnet Ethernet MAC Address can also be read via the unit controller OITS display.

Table 5. BACnet Ethernet Parameters

Name

BAS Network

Protocol

Device

Instance

BACnet Ethernet/ This point sets the desired network protocol.

0-4194302/Device Instance of the

BACnet Communication Module.

Object Name The allowable range of characters for the device object name is 1 to 31 characters./If an empty string is read from the unit controller, the Initial

Value is used.

The device object name is visible to the BACnet network as the object name of the device object.

None/Set this value to BACnet Ethernet. Cycle power to the unit controller after changing this parameter.

3000/This must be unique throughout the entire

BACnet network. If a value greater than

4194302 is read from the unit controller, the following default value is used:

3000 + address

Where address is the last two octets of the MAC address.

Magnitude/ This name must be unique throughout the entire BACnet network. If an empty string is read from the controller, the

BACnet card will use the following default

MTE Chiller UCA-address

Where address is the MAC address.

Changing the device object name may affect the operation of other BACnet devices on the network that have previously discovered the device. The BACnet Communication Module takes up to 60 seconds before this change is recognized. A power cycle is not needed.

Note:

If unit controller application software requires uploading in the field, the network configuration parameters revert to their default values. Please contact the McQuay Chiller

Technical Response Center at 1-877-349-7782 for assistance with upgrading unit controller application software.

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Figure 3. OITS Display of Network Parameters – BAS1

Figure 4. OITS Display of Network Parameters – BAS2

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