Johnson Controls IOM3721 Installation Instructions Manual Download Page 9

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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 (

Figure

). 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

for valid device 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).

3. Set switch 128 to ON

only

for controllers on a

ZFR1800 Series Wireless Field Bus application. For

all hard-wired SA and FC bus applications, ensure
that switch 128 is set to Off.

Note:

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

Use on Description