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Setup and Adjustments
Setting the device address
Metasys expansion modules are master devices
on MS/TP (SA or FC) buses. Before operating an
expansion module on a bus, 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
Use on Descriptions
Address
Reserved for FC Bus Supervisory
0
(Switch 128
Controller (not for use on
Off)
controllers or expansion modules).
Reserved for peripheral devices
1-3
(Switch 128
(not for use on controllers or
Off)
expansion modules).
Used for MSTP master devices
4-127
(controllers and expansion
(Switch 128
modules) that are hardwired to an
Off)
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 must be set
to OFF for all hard-wired SA and FC Bus applications.
Figure 8: Device address DIP switch Block set to
address 21
Note: Metasys expansion modules ship with
switch 128 ON and the remaining address
switches off rendering the expansion module
wired subordinate devices, which do not
operate on MSTP buses, but do not interfere
with bus operation. Set a valid and unique
device address on the expansion module
before applying power to the expansion
module on the bus.
To set the device addresses on Metasys 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.
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 a unique and sequential device address for
each of the expansion module 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 (for example, 4, 5, 6, 7, 8,
9). The controllers/expansion modules do
not need to be physically connected on
the bus in their numerical device address
order.
4.
Write each expansion module's device address
on the white label below the DIP switch block
on the expansion module's cover.
Removing the expansion module
cover
About this task:
IOM3733 Input/Output Module Installation Guide
11
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