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 controllers do
not
need to be physically
connected on the bus in their numerical device address order.
5. Write each FX-PCG's device address on the white label below the DIP switch block on the
controller's cover.
Table 7 describes the FC bus and SA bus devices addresses for Johnson Controls MS/TP com-
munications bus applications.
Refer to the
FX-PC Series Controllers MS/TP Communications Bus Technical Bulletin
(LIT-12011670)
or
MS/TP Communications Bus for BCPro System Technical Bulletin (LIT-12011908)
for
more information on controller device addresses and how to set them on MS/TP buses.
Table 7: 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 FX-PC controllers).
1 to 3
(Switch 128 Off)
Reserved for peripheral devices (not for use on FX-PC controllers).
4 to 127
(Switch 128 Off)
Used for MS/TP master devices (FX-PC) 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 FX-PC
controllers).
Note:
FX-PCGs 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 the FX-PC 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.
Removing the controller cover
Important:
Electrostatic discharge can damage controller components. Use proper
electrostatic discharge precautions during installation, setup, and servicing to avoid damaging
the controller.
Important:
Disconnect all power sources to the controller before removing cover and
changing the position of any jumper or the EOL switch on the controller. Failure to disconnect
power before changing a jumper or EOL switch position can result in damage to the controller
and void any warranties.
The controller cover is held in place by four plastic latches that extend from the base and snap into
slots on the inside of the housing cover.
To remove the controller cover:
1. Place your fingernails under the two cover lift tabs on the sides of the housing cover and
gently pry the top of the cover away from the base to release the cover from the two upper
latches.
27
FX-PCG26 General Purpose Programmable Controller Installation Instructions
