Ritron DATAFLOW RTU Technical Manual page 49

8.4 EXAMPLE 3 configures DATAFLOW RTU inputs to illustrate THRESHOLD, DEAD
ZONE and TIME DELAY. The configuration includes Digital Input l 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.l RTU ID 1 SETUP: Example 3 requires oneDATAFLOW RTUto be wired and its
hardware configured according to Figure B2 - EXAMPLE I RTU ID l Wiring Diagram,
shown on page B-26. Load Software Programming configuration file EXP31D1 .USR into
RTU ID l. Replace the switches connected to Input l 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 l RTU ID 2 Wiring Diagram,
shown on page B-27. Load Software Programming configuration file EXP11D2.USR into
RTUID2.
8.4.3 EXPLANATION: THRESHOLD/ DEAD ZONE is a value that differs depending on the
type of Input.
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•
8.4.3.l
relating to 1.25 Volts on the multimeter. RTU ID 2, Digital Output l 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 p ossible across the l 00 kOhm potentiometer on Input 1 is 4.2 Volts.
8.4.3.2
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
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 I, Input 3 changes to over 11 mA or under 9
rnA.
8.4.3.4
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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For a DIGITAL Input, the value is THRESHOLD, the border b etween 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.
The THRESHOLD ofRTU ID 1, Input 1 is programmed to be 25%, t he value
The THRESHOLD of RTU ID !, Input 2 is programmed to be 75%, the value
The DEAD ZONE ofRTU ID 1, Input 3 is programmed to be 10 %. Cycle the
The DEAD ZONE ofRTU ID!, Input 4 is programmed to be 20 %. Cycle the
EXAMPLES
( B-19 )
DATAFLOWRTU