Ritron DATAFLOW RTU Series Guia do Utilizador descarregar pdf (Página 40)

DATAFLOW RTU

EXAMPLE 1

8.2 EXAMPLE 1 is a pair of DATAFLOW RTUs having 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:

RTU ID 1 RF LINK RTU ID 2

Input 1 connected to Digital Output 1

Input 2  Digital Output 2

Input 3  Analog Output 1

Input 4  Analog Output 2

Digital Output 1  Input 1

Digital Output 2  Input 2

Analog Output 1  Input 3

Analog Output 2  Input 4

8.2.1 RTU ID 1 SETUP: Example 1 requires one DATAFLOW RTU to 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 RTU ID 1.

8.2.2 RTU ID 2 SETUP: Example 1 requires the other DATAFLOW RTU to 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

RTU ID 2.

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

· FAIL-SAFE STATE

· I/O CONFIG

8.2.3.1 (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 of ID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 1 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)

( B-15 )

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