12
Figure 9: DO connection example
Electrical specification (each point):
–
Open circuit voltage, 0 Vdc
–
Short circuit leakage current, 0 uA typical
–
Output capacitance, 1000 pF typical
–
Maximum allowable voltage range on output, -0.5 Vdc to 26.5 Vdc
Input specification
–
Open Drain FET type
–
ON Resistance, 0.1 Ω Typical (including PTC fuse resistance)
–
Maximum pulse current, 3 A for 5 seconds
–
Maximum continuous sink current, 2 A
Analog inputs
Figure 10 is a typical point schematic for the analog input. Figure 11 shows an example of point connections for the AI and a
typical 2-wire 4
–20 mA field device.
Figure 10: Typical AI point schematic
TYPICAL SINK OUTPUT FIELD WIRING
BATTERY (+) OR POWER
POSITIVE TERMINAL (24 VDC MAX)
SOURCE
BATTERY (-) OR POWER
COMMON OR GND SOURCE
TERMINAL
LOAD
SIG
GND
SIG
GND
24V
2.5A
OUTPUT CONTROL
GND
SIG (+)
0-10V To ADC
255 Ohm
Resistor
24V
Input Mode Select
