Xylem YSI IOEM Safety And Installation Manual page 27

Figure 3.10 is a wiring diagram for the most common IOEM and REM network
configuration where a master 5X00 instrument is the first physical device in the
network.
Figure 3.10
6. Wire all network terminal strips prior to network testing, but only con-
nect a network terminal strip to the first and last devices on the network
(*see note below). Network testing cannot be done if stubs exist (** see
note below).
Configure dip switches for all IOEM and REM slave instruments on the
7.
network. See configure dip switches for slaves - page 55.
Notes:
- For testing - If the master is not the first physical device on the network,
place network terminal strip on the master and on the first and last physical
devices on the network. (In this case two slaves will need to be tested at
the same time.) - figure 3.11 on next page .
- The network must not include any stubs. **A stub is created when the
last wired network terminal strip is not connected to a network slave -
figure 3.9 - page 49.
IOEM/REM Safey and Installation Guide
52
Installation and Wiring
Testing network configurations
Follow wiring instructions below to avoid testing network wiring with stubs.
Use below network wiring testing method when master is first physical device on network.
-represents wired network termination strip
-terminal strips that appear within master/slave box represent terminal strips that are physically
connected to device
-terminal strips that appear outside slave box represent terminal strips not connected to device
master slave
slave
1
2
When master is first physical device on network, as shown above, connect terminal strip to master and last
slave (slave 4) to begin network testing. Terminal strips for slaves located between the master and the last
slave are then connected, one, by one beginning with slave device furthest from master and continuing to
slave devices closest to master. Testing in the above graphic would occur first with slave 4, then slave 3,
then slave 2, ending with slave 1.
Use below network wiring testing method when master is not first physical device on network.
-represents wired network termination strip
-terminal strips that appear within master/slave box represent terminal strips that are physically
connected to device
-terminal strips that appear outside slave box represent terminal strips not connected to device
slave slave master
1 2
When master is not the first physical device on network, as shown above, connect terminal strip to master
and outer most slaves (slaves 1 and 4) to begin network testing. Testing in above graphic would occur first
with slaves 1 and 4, and then continuing by testing slave device 2, or slave device 3 until all network
wiring is tested.
Figure 3.11
IOEM and REM networks must be configured point-to-point (instrument-to-instru-
ment). Network wiring cannot contain loops, stars, or stubs - figure 3.12, page 54.
IOEM/REM Safey and Installation Guide
Installation and Wiring
slave slave
4
3
slave slave
3 4
53