1-12
Digital Input
The Totalflow XRC provides 4 digital inputs(2 of which may be used as high speed pulse
inputs) as a means to monitor inputs from external equipment with the XRC. See Figure 1–
5, Item #s 15 & 16.
When connecting or disconnecting any wires to the XRC-195 Board, you
should remove all power sources and make sure that you are grounded
properly.
Digital Inputs
The Digital Input reads an external contact. Below you will find the
electrical and input specifications as well as information on enabling or
disabling DeBounce.
Electrical
Specification
(each point):
•
Open circuit voltage: 5VDC (Internally pulled up to 5VDC Nom.)
•
Short circuit leakage current: -395uA typical.
•
Input capacitance: 0.1 ufd typical.
•
Maximum allowable voltage range on input -0.5VDC to 15VDC.
•
Maximum frequency input 100Hz @ 50% duty cycle with de-bounce
enabled.
•
Maximum frequency input 10KHz @ 50% duty cycle with de-bounce
disabled.
Input
Specification
•
Dry Contact, Open Collector or Active Voltage.
•
Minimum contact resistance to activate input 1000
Ω
.
•
Maximum voltage to deactivate the input: 3.1V (referenced to GND
terminal.)
•
Minimum voltage to activate the input: 0.5V (referenced to GND
terminal.)
•
Conductor pairs must be shielded to prevent spurious signals.
DeBounce
The XRC-195 Board includes Jumper Pins to enable or disable
debounce. See
Figure 1–5
, Item# 14 for the Jumpers. The inclusion of the
Debounce capacitor when enabled allows the unit to ignore noise when
manual switches are set. When disabled, the high speed pulses are
received exactly as sent. If input is received as a solid state signal, then
debounce is not needed, it should be disabled.
Typical Point
Schematic
GND
SIG
DEBOUNCE SELECT
1K
+5
.1UF
10K
INPUT SENSE
Continued on Next Page
Содержание XRC6490
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Страница 19: ...1 5 Standard Enclosure Cont RC 6790 X Figure 1 2 Model XRC6790 Continued on Next Page ...
Страница 20: ...1 6 Standard Enclosure Cont 18 00 15 52 RC 6890 X 28 81 15 52 28 00 20 09 18 70 Figure 1 3 Model XRC6890 ...
Страница 24: ...1 10 XRC 195 Board Specifications Cont Figure 1 5 Complete View XRC 195 Board Continued on Next Page ...
Страница 41: ...1 27 Totalflow Input Output Modules Cont Figure 1 16 XRC6990 Inside View ...
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Страница 56: ...2 14 AC Charging Unit Installation Cont Figure 2 12 DC Wiring Instructions Figure 2 13 AC Wiring Instructions ...
Страница 63: ...2 21 XRC Communication Jumper Settings and Field Wiring Cont Figure 2 19 Other Field Wiring I O Connections ...
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Страница 86: ...4 12 Replacing XRC 195 Board Cont Figure 4 5 XRC Board Connections ...
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Страница 112: ...5 24 12V Communication Supply Voltage Test Cont Figure 5 9 XRC 195 Communication Wiring ...
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