Setup And Adjustments; Setting The Device Addresses - Johnson Controls IOM3721 Installation Instructions Manual

Setup and Adjustments

Setting the Device Addresses

Metasys field controllers are master devices on MS/TP
(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. You set a field controller's
device address by setting the positions of the switches
on the DIP switch block at the top of the controller
3). Device addresses 4 through 127 are the valid
addresses for these controllers.
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 a field controller to operate on a ZFR1800
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
Note: Metasys field controllers ship with switch 128 ON
and the remaining address switches off rendering
the controllers wired slave devices, which do not
operate on MS/TP buses, but will not interfere
with bus operation. Set a valid and unique device
address on the field controller before applying
power to the controller on the bus.
To set the device addresses on Metasys field controllers:
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. See Table 5
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).
3. Set switch 128 to ON only for controllers on a
ZFR1800 Series Wireless Field Bus application. For
IOM3721 Input/Output Module Installation Instructions
(Figure
for valid device addresses.
all hard-wired SA and FC bus applications, ensure
that switch 128 is set to Off.
Note: Do not connect a field controller with switch
128 set to ON to an active (hard-wired) SA or
FC bus. When a controller 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 controller
is disconnected or switch 128 is set to off.
Refer to 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 MS/TP Communications Bus Technical
Bulletin (LIT-12011034) for more information on field
controller device addresses and how to set them on
MS/TP buses.
Table 5: SA/FC Bus Device Address Descriptions
Device Use on Description
Address
0 Reserved for FC Bus Supervisory Controller
(not for use on field controllers).
(Switch
128 Off)
1 to 3 Reserved for peripheral devices (not for use
on field controllers).
(Switch
128 Off)
4 to 127 Used for MS/TP master devices (field
controllers) that are hardwired to an SA bus
(Switch
or FC bus.
128 Off)
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