Ritron DATAFLOW RTU Series Podręcznik Użytkownika Pobierz pdf (Strona 45)

Software/Programming

EXAMPLE 4

8.5 EXAMPLE 4 configures two RTUs to illustrate XMIT CHECK-IN and RCV CHECK-IN

intervals, and R (Revert) FAIL-SAFE STATE of the DATAFLOW RTU. RTU ID 1 sends one

contact closure to RTU ID 2. All Digital Outputs are OPEN at power-on.

· When RTU ID 1 detects a loss of RF link, both Digital Outputs close. When the RF

link is re-established, Digital Output 1 opens and Digital Output 2 remains closed.

· When RTU ID 2 detects a loss of RF link, Digital Output 1 will open and Digital

Output 2 will close. When the RF link is re-established, Digital Output 1 produces

the proper status from RTU ID 1 and Digital Output 2 opens.

· The RF link is tested at least every 10 seconds.

NOTE: Example 4 uses a XMIT CHECK-IN interval of 10 seconds, purposely a short interval for

demonstration purposes. In real applications, use longer check-in intervals to help maintain the life

span of the RTU  the longer the check-in interval, the fewer transmissions the RTU makes.

8.5.1 RTU ID 1 SETUP: Example 4 requires one DATAFLOW RTU to be wired and its hardware

configured according to Figure B7 - EXAMPLE 4 RTU ID 1 Wiring Diagram shown on page

B-31. Load Software Programming configuration file EXP4ID1.USR into RTU ID 1.

8.5.2 RTU ID 2 SETUP: Example 4 requires the other DATAFLOW RTU to be wired and its

hardware configured according to Figure B8 - EXAMPLE 4 RTU ID 2 Wiring Diagram

shown on page B-32. Load Software Programming configuration file EXP4ID2.USR into

RTU ID 2.

8.5.3 EXPLANATION:

· RTU ID 1 XMIT CHECK-IN is set to 10 seconds.

· RTU ID 2 RCV CHECK-IN is set to 12 seconds.

NOTE: The difference in the XMIT CHECK-IN and RCV CHECK-IN times allows for tolerance

differences in the two RTUs.

8.5.3.1 RTU ID 1 sends a message (XMIT CHECK-IN) every 10 seconds whether or not a change

occurs on the input. If a valid response is not received within 12 seconds, FAIL-SAFE

STATE A is executed. This ensures that 10 seconds is the longest period of time RTU ID 2

can be inactive before RTU ID 1 determines the RF link has failed.

8.5.3.2 RTU ID 2 requires a valid message (RCV CHECK-IN) from RTU ID 1 every 12 seconds or

less. If a valid message is not received within 12 seconds, FAIL-SAFE STATE E is

executed. This ensures that 12 seconds is the longest period of time RTU ID 1 can be

inactive before RTU ID 2 determines the RF link has failed.

8.5.3.3 The R (Revert) columns of the FAIL-SAFE STATE table determines the state of an output

when RF link is re-established.

· With R (Revert) setting Y, the output is forced to its initial condition. With R

(Revert) setting N, the output remains in its current state.

· If the output is controlled by another RTU, the controlling input state determines the

state of the output; R (Revert) setting is not valid.

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Ritron DATAFLOW RTU Series Podręcznik Użytkownika Strona 45