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, 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 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.
Switch 128 must be set to OFF for all hard-wired SA
and FC Bus applications
Figure 9: Device address DIP switch block set to
address 21
Note:
Metasys
controllers 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,
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 modules 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 (4, 5, 6, 7, 8, 9, and
so on). The 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.
The following table describes the FC bus and SA bus
device addresses for Johnson Controls MS/TP com-
munications bus applications.
Table 6: SA/FC bus device address descriptions
Device Address Use on Descriptions
0
(Switch 128 Off)
Reserved for FC Bus Supervisory Controller (not
for use on controllers or expansion modules).
1-3
(Switch 128 Off)
Reserved for peripheral devices (not for use on
controllers or expansion modules).
4-127
(Switch 128 Off)
Used for MSTP master devices (controllers and
expansion modules) that are hardwired to an
SA bus or FC bus.
Removing the expansion module
cover
Important:
Electrostatic discharge can damage
expansion module components. Use proper
electrostatic discharge precautions during
installation, setup, and servicing to avoid
damaging the expansion module.
Important:
Disconnect all power sources to
the expansion module before removing the
cover and changing the position of any jumper
or the EOL switch on the expansion module.
Failure to disconnect power before changing
a jumper or EOL switch position can result in
damage to the expansion module and void any
warranties.
IOM3731-0A Expansion Input/Output Installation Guide
10