Table 6: SA/FC bus device address descriptions
Device
address Use on description
4 to 127
(Switch
128 Off)
Used for MS/TP master devices
(controllers or expansion modules) that
are hardwired to an 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
® field controllers ship with
switch 128 ON and the remaining address
switches off rendering the controllers 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 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.
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 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.
The expansion module 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 expansion module cover,
complete the following steps:
1. Place your fingernails under the two cover
lift tabs (Figure 1) 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.
IOM2723 Input/Output Module Installation Guide
13
