Setting the device address - Metasys - MS-VMA1615 - MS-VMA1626 - MS-VMA 1628 - MS-VMA1630 - Field Device - VMA16 VAV Modular Assembly

VMA1615/1626/1628/1630 VAV Controllers Installation Guide

Brand
Metasys
Product name
VMA16 VAV Modular Assembly
Document type
Installation Guide
Part number
24-10143-217
Document revision
K
Revision date
2019-10-18
Language
English

Metasys field controllers are master devices on BACnet® MSTP (SA or FC) Buses. Before operating field controllers on a bus, you must set a valid and unique device address for each controller on the bus.

Set a field controller’s device address by setting the positions of the switches on the Device Address DIP switch block at the top of the controller (Figure 1) . Device addresses 4 through 127 are the valid addresses for these controllers.

The DIP switch block (Figure 1) has eight switches numbered 128, 64, 32, 16, 8, 4, 2, and 1. Switches 64 through 1 are device address switches. Switch 128 is a mode switch that enables a field controller to operate on a ZFR /ZFR Pro Series Wireless Field Bus. Switch 128 must be set to OFF for all hard-wired SA and FC Bus applications. Set Switch 128 to ON for wireless FC Bus applications only.

Figure 1. Device Address Switches Set to 21

Note: Metasys field controllers ship with Switch 128 ON and the remaining address switches OFF. This renders the controllers wired subordinate devices, which do not interfere on MSTP Buses and do not interfere with bus operation. Set a valid and unique device address on the controller before applying power to the controller on the bus.

To set the device addresses on a Metasys field controller:

  1. Set all of the switches on the field controller’s device address DIP switch block (128 through 1) to OFF.
  2. Set one or more of the seven address switches (64 through 1) to ON, so that the sum of the switch numbers set to ON equals the intended device address. See Table 1 and Table 2 for valid field controller addresses. Set the highest number switch that is less than or equal to the intended device address to ON. Then continue setting lower numbered switches until the total equals the intended address. For example, if the intended device address is 21, set Switch 16 to ON first, then set Switch 4 ON, followed by Switch 1 (16+4+1=21). See Figure 1 .
  3. Set Switch 128 to ON only for controllers on a ZFR /ZFR Pro Series Wireless Field Bus application. For all hard-wired SA and FC Bus applications, ensure that Switch 128 is set to OFF.
    Note: Do not connect a wirelessly enabled field controller to a wired FC Bus.

    Refer to the WNC1800/ZFR182x Pro Series Wireless Field Bus System Technical Bulletin (LIT-12012356) or the ZFR1800 Series Wireless Field Bus System Technical Bulletin (LIT-12011295) for more information on device addresses in wireless applications.

  4. Set a unique and sequential device address for each of the field controllers connected on the SA or FC Bus, starting with device address 4. To ensure the best bus performance, set sequential device addresses with no gaps in the device address range (4, 5, 6, 7, 8, 9, and so on). The field controllers do not need to be physically connected on the bus in their numerical device address order.
  5. Write each field controller’s device address on the white label below the DIP switch block on the controller’s cover.

Refer to the MSTP Communications Bus Technical Bulletin (LIT-12011034) for more information on field controller device addresses and how to set them on MSTP Buses.

Table 1 and Table 2 show and describe the valid FC Bus and SA Bus device addresses for Johnson Controls MSTP communications bus applications.

Table 1. FC Bus device address descriptions

Device address

Address description

0

(Switch 128 OFF)

Reserved for FC Bus Supervisory Controller (not valid for field controllers).

1 to 3

(Switch 128 OFF)

Reserved for peripheral devices (not valid for field controllers).

4 to 127

(Switch 128 OFF)

Valid for MSTP Master field controllers on a hard-wired SA Bus or FC Bus.

Table 2. Wireless field bus device address

Device address

Address description

0 to 3

(Switch 128 ON)

Reserved addresses for wired subordinate devices (not valid for field controllers).

Note: Metasys controllers ship with 128 ON and the remaining address switches OFF, rendering the controllers wired subordinate devices, which do not operate on Metasys field buses.

4 to 127

(Switch 128 ON)

Valid for MSTP Master field controllers on wireless FC Buses only.

Note: Do not connect a Metasys controller with these device addresses to an active wired SA or FC Bus. When a controller with one of these device address is connected to a wired field bus, the field bus is rendered inoperable until the controller is disconnected or Switch 128 is set to OFF.