Ritron DATAFLOW RTU Series Guía de usuario descargar pdf (Pagina 44)

DATAFLOW RTU

EXAMPLE 3

8.4 EXAMPLE 3 configures DATAFLOW RTU inputs to illustrate THRESHOLD, DEAD ZONE

and TIME DELAY. The configuration includes Digital Input 1 having a 25% Threshold and

Digital Input 2 having a 75% Threshold and a 5-second Time Delay; Analog Input 3 having

a 10% Dead Zone and Analog Input 2 having a 20% Dead Zone. The configuration of

Example 3 is similar to that of Example 1.

8.4.1 RTU ID 1 SETUP: Example 3 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 EXP3ID1.USR into RTU ID 1. Replace

the switches connected to Input 1 and Input 2 with a 100 kOhm potentiometer. Connect a

multimeter to measure voltage across the potentiometer.

8.4.2 RTU ID 2 SETUP: Example 3 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.

8.4.3 EXPLANATION: THRESHOLD/ DEAD ZONE is a value that differs depending on the type

of Input.

· For a DIGITAL Input, the value is THRESHOLD, the border between a digital HIGH

and LOW. Any value above the border as decoded by the RTU is a HIGH; any value

below the border as decoded by the RTU is a LOW.

· For an ANALOG Input, the value is DEAD ZONE, the amount of change the Input

must incur to transmit a message.

8.4.3.1 The THRESHOLD of RTU ID 1, Input 1 is programmed to be 25%, the value relating to 1.25

Volts on the multimeter. RTU ID 2, Digital Output 1 opens with a multimeter reading above

1.25 Volts; RTU ID 2, Digital Output 1 closes with a multimeter reading below 1.25 Volts.

NOTE: Because of the internal 20 kOhm resistor, the highest voltage possible across the

100 kOhm potentiometer on Input 1 is 4.2 Volts.

8.4.3.2 The THRESHOLD of RTU ID 1, Input 2 is programmed to be 75%, the value relating to 3.75

Volts on the multimeter. RTU ID 2, Digital Output 2 OPENS when the multimeter reading is

above 3.75 Volts; RTU ID 2, Digital Output 2 CLOSES when the multimeter reading is

below 3.75 Volts. NOTE: See Paragraph 7.4.4 for details of the TIME DELAY programmed

into Input 2.

8.4.3.3 The DEAD ZONE of RTU ID 1, Input 3 is programmed to be 10 %. Cycle the power of the

RTU (turn the RTU power OFF, then ON) to ensure the current source for Input 3 is 10 mA.

Change the value of the current source to Input 3. RTU ID 2, Analog Output 1 should not

change until RTU ID 1, Input 3 changes to over 11 mA or under 9 mA.

8.4.3.4 The DEAD ZONE of RTU ID 1, Input 4 is programmed to be 20 %. Cycle the power of the

RTU to ensure the voltage value for Input 3 is 2 Volts. Change the value of the voltage

source to Input 3. RTU ID 2, Analog Output 2 should not change until RTU ID 1, Input 4

changes to over 2.4 Volts or under 1.6 Volts.

8.4.4 EXPLANATION: TIME DELAY is the amount of time an input must remain changed before

the RTU will consider the change valid  Digital Input 2 must remain changed for at least

5 seconds. If the current state of this input is LOW, changing the state to HIGH for less than

5 seconds then returning the state to LOW will not cause the RTU to transmit a message.

TIME DELAY is used to ignore false activation and glitches on an input.

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