DATAFLOW RTU
EXAMPLE 1
8.2 EXAMPLE 1 is a pair of
DATAFLOW RTU'
shaving two digital channels and two
analog channels in each direction; each RTU is configured for a maximum of five (5)
message attempts. If an RTU detects loss of RF link, both relay outputs close, and both
analog outputs are driven to full scale. The inputs and outputs are mapped to each other as
shown in the following table:
RTUID 1
RF LINK
RTU 102
lnnut 1
connected to
Diaital 0"
ut t
!nnut
2
.
Dinital Ou
,ut 2
lnnut 3
"
Anal,..,...Q,
~ut 1
lnmrt 4
"
Anal'""" O•
ut 2
Diattal O• ""ut 1
"
ln□ut 1
Diaital 0-;;;;;-ut 2
"
lnout 2
Ana!--... 0
ut 1
"
lnout 3
Analon 0
ut2
"
lnnut4
8.2.1 RTU ID 1 SETUP: Example 1 requires
oneDATAFWW RTUto
be wired and its
hardware configured according to Figure B2 - EXAMPLE 1 RTU ID 1 Wiring Diagram,
shown on page B-26. Load Software Programming configuration file
EXP1ID1.USR
into
RTUID 1.
8.2.2 RTU ID 2 SETUP: Example 1 requires the other
DATAFLOW RTUto
be wired and its
hardware configured according to Figure B3 - EXAMPLE 1 RTU ID 2 Wiring Diagram,
shown on page B-27. Load Software Programming configuration file
EXP1ID2.USR
into
RTUID2.
8.2.3 EXPLANATION: Example 1 illustrates basic RTU operation. Examine the configuration
files of the RTU' s to understand the following items before advancing to Example 2:
•
(RTU)ID
•
SEND LIST
•
FATI..-SAFE STATE
•
I/OCONFIG
8.2.3.l
(RTU) ID is a unique address given to each RTU in a system. Example 1 uses ID
numbers 1 and 2. The ID number is compared to the ID number of every incoming
message. When the ID number on an incoming message matches the (unit) ID number, the
RTU processes the message and sends an acknowledgment. The RTU ignores the message
if the ID number does not match.
NOTE:
Use any unique number(s) from 1 to 255 to assign ID numbers.
8.2.3.2
SEND LIST is the list ofID's used by the RTU when transmitting messages. Each
outgoing message has "to ID n" attached to it. In Example 1, RTU ID 1 has "to ID 2" in its
SEND LIST and RTU ID 2 has "to ID l" in its SEND LIST. Hence, RTU ID 1 transmits
messages intended only for RTU ID 2, and RTU ID 2 transmits messages intended only
for RTU ID 1. Because each RTU in Example 1 sends information to only one ID, other
SEND LIST values are set for 0.
NOTE:
The maximum number of ID entries in the SEND LIST is four.
(Example 1 continued on next page)
(8-15)
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