Setting the device address - Facility Explorer - Part No. 24-10144-173 - FX-PCX2721-0 - Field Device - FX-PCX27 Expansion Input/Output Module

FX-PCX2721 Expansion Input/Output Module Installation Instructions
Product
Controls > Input/Output Controls > FX-PCX27 Expansion Input/Output Module
Document type
Installation Guide
Document number
Part No. 24-10144-173
Document revision
G
Revision date
2019-03-22

About this task

FX-PCX expansion modules are master devices on MS/TP (SA or FC) buses. Before operating expansion modules on a bus, you must set a valid and unique device address for each expansion module on the bus. You set an expansion module's device address by setting the positions of the switches on the DIP switch block at the top of the expansion module. Device addresses 4 through 127 are the valid addresses for these expansion modules.

The following table describes the FC bus and SA bus device addresses for Johnson Controls MS/TP communications bus applications:

Table 1. SA/FC bus device address descriptions
Device address Use on description

0

(Switch 128 Off)

Reserved for FC Bus Supervisory Controller (not for use on controllers or expansion modules).

1 to 3

(Switch 128 Off)

Reserved for peripheral devices (not for use on controllers or expansion modules).

4 to 127

(Switch 128 Off)

Used for MS/TP master devices (controllers or expansion modules) that are hardwired to an SA Bus or FC Bus.

The DIP switch block 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 an expansion module to operate on an FX-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 DIP switch block set to address 21

To set the device addresses on FX-PCX expansion modules, complete the following steps:

Procedure

  1. Set all of the switches on the address DIP switch block (128 through 1) to OFF.
  2. Set one or more of the seven address switches (64 though 1) to ON, so that the sum of the switch numbers set to ON equals the intended device address, and ensure that switch 128 remains set to OFF.
    Note: To do this, 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 switches 16, 4, and 1 to ON (16+4+1= 21) and all other switches to OFF.
  3. Set switch 128 to ON only for expansion module 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 an expansion module with switch 128 set to ON to an active (hard-wired) SA or FC bus. When an expansion module with switch 128 set to ON and a device address from 4 to 127 is connected to a wired field bus, the entire field bus is rendered inoperable until the expansion module is disconnected or switch 128 is set to OFF.
    Refer to the WNC1800/ZFR182x Pro Series Wireless Field Bus System Technical Bulletin (LIT-12012356) or the FX-ZFR Series Wireless Field Bus System Technical Bulletin (LIT-12011660) for more information on device addresses in wireless applications.
  4. Set a unique and sequential device address for each of the expansion modules connected on the SA or FC bus starting with device address 4.
    Note: 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 expansion modules do not need to be physically connected on the bus in their numerical device address order
  5. Write each expansion module's device address on the white label below the DIP switch block on the expansion module's cover.

    Table 2. SA/FC bus device address descriptions
    Device address Use on description

    0

    (Switch 128 Off)

    Reserved for FC Bus Supervisory Controller (not for use on controllers).

    1 to 3

    (Switch 128 Off)

    Reserved for peripheral devices (not for use on controllers).

    4 to 127

    (Switch 128 Off)

    Used for MS/TP master devices (controllers) that are hardwired to an SA bus or FC bus.

    0 to 3

    (Switch 128 ON)

    Reserved addresses for wired subordinate devices (not for use on controllers).

    Note: Controllers ship with switch 128 ON and the remaining address switches off rendering the controllers wired subordinate devices, which do not operate on MS/TP buses.

    4 to 127

    (Switch 128 ON)

    Valid for MS/TP Master controllers on wireless FC Buses only.

    Note: Do not connect a controller with switch 128 ON to an active (hard-wired) SA or FC bus. When a controller with switch 128 ON and a device address from 4 to 127 is connected to a wired field bus, the entire field bus is rendered inoperable until the controller is disconnected or switch 128 is set to Off.