Table of Contents
Advertisement
Setup and adjustments
Setting the device address
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 6: SA/FC bus device address descriptions
Device address
Use on description
0
Reserved for FC Bus Supervisory Controller (not for use on controllers or
expansion modules).
(Switch 128 Off)
1 to 3
Reserved for peripheral devices (not for use on controllers or expansion
modules).
(Switch 128 Off)
4 to 127
Used for MS/TP master devices (controllers or expansion modules) that are
hardwired to an SA Bus or FC Bus.
(Switch 128 Off)
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 9: Device address DIP switch block set to address 21
To set the device addresses on FX-PCX expansion modules, complete the following steps:
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.
FX-PCX2721 Expansion Input/Output Module Installation Instructions
19
Advertisement
Table of Contents
