Ritron DATAFLOW RTU Series Uživatelská příručka stáhnout pdf (Strana 41)

Software/Programming

EXAMPLE 1 (continued)

8.2.3.3 The FAIL-SAFE STATE table controls RTU outputs when the RTU detects a loss of RF

link. Because Example 1 has only one entry in the SEND LIST of each RTU, only FAIL-

SAFE STATE A is used. If RTU ID 1 detects loss of RF link, RTU ID 1 outputs are

controlled according to its FAIL-SAFE STATE A; if RTU ID 2 detects loss of RF link,

RTU ID 2 outputs are controlled according to its FAIL-SAFE STATE A.

8.2.3.3.1 The loss of RF link is detected by a RTU according to the following process: After a

RTU transmits a message, it waits for acknowledge.

· If acknowledge is received, the RF link is good and the process ends.

· If acknowledge is not received, the RTU retransmits the message, repeating the

sequence until reaching the maximum number of retransmit attempts. The

process ends with the RTU detecting loss of RF if the last (maximum number)

retransmit is made with no acknowledge being received.

8.2.3.4 I/O CONFIG is Input/ Output control of the RTU displayed in the Programming Software

I/O configuration screen. Examine the following items for Example 1:

8.2.3.4.1 Inputs 1 and 2 are configured to be inverted digital inputs.

NOTES: Set digital inputs INVERT to YES to make an open digital input produce an open

relay output and a closed digital input produce a closed relay output.

Set the INVERT for analog inputs 3 and 4 to NO to produce a positive transfer

function on an output.

8.2.3.4.2 All four outputs are used. The initial condition  the state an output is forced to upon

power-on  is set for relays to be open and analog outputs to be forced to 0 scale.

8.2.3.4.3 FROM ID is the transmitting RTU ID number; FROM ID numbers are listed in the

following chart:

FROM ID (RTU ID #)

RTU ID 1 2

RTU ID 2 1

8.2.3.4.4 FROM LOC is the number of the input that controls the output; FROM LOC numbers

are listed in the following chart:

FROM LOC (INPUT #)

Digital Output 1 1

Digital Output 2 2

Analog Output 1 3

Analog Output 2 4

( B-16 )

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 62 63

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Ritron DATAFLOW RTU Series Uživatelská příručka Strana 41