Echelon LonPoint Module - Manual (Page 76)

6-4 Installing the DIO-10 Input/Output
Modules
Both digital inputs have internal pull-up resistors (2.43 K ) connected to
5V through a diode. This pull-up resistor allows the use of low-cost (non-
noble, metal-plated) contacts in external dry contacts (relays). The diode
prevents current flow through the pull-up resistor to the power supply
when the input is not a dry contact but a logic voltage above 5V. When the
input voltage is below 5V, the external electronics must sink current.
When the input voltage is above 5V, then the diode prevents the flow of
current through the pull-up resistor. For inputs above 5V, a separate
protection diode is forward biased through a 21.5K resistor. Table 6.3
details the sink (-)/source (+) currents required of the external electronics
at various input voltages.
Table 6.3 Sink/Source Currents
Input Voltage Input Current
0V -1.7mA
3V -0.5mA
5V 0mA
10V +0.2mA
20V +0.65mA
32V +1.21mA
Note: The two inputs on the DIO-10 are isolated from the power supply
and from the network, but are not isolated from each other. If the
installation requires that the inputs be isolated from each other, additional
LonPoint modules should be used.
Table 6.4 LonPoint DI-10 Digital Input Module Specifications
Function Description
Processor/memory Neuron 3150 Chip, 10MHz, 56K flash memory
Service function Recessed service switch, service LED, power/wink LED.
Dual tear-off bar-code Neuron ID self-adhesive tag for
application to red-line drawings in the field
I/O 2 digital inputs, 5,12,24,31V or dry contact. Up to 20kHz
frequency measurement; 2 relay outputs (each has one Form A
and one Form B contact with a common wiper) rated at 2A
continuous 6A surge at 30 VAC or 24VDC. Separate status
LEDs for each input
I/O isolation 100V, transformer isolation. Inputs are isolated from the input
power and the network but not from each other.
Transceiver type FTT-10A with blocking capacitors for compatibility with link
power channel
Network connector Phone plug connector accessible from front panel
Input power 16-30VAC or VDC @ 4.75VA, internally isolated power supply
Mounting Type 1 or Type 1D Base Plate
Temperature -40 to +85°C, operating and non-operating