11
iDAQ-731_751_763D User Manual
C
ha
pte
r 2
In
sta
lla
tio
n a
nd
F
ield
A
pp
lic
atio
n
For a source type digital output, the external source is connected to the digital output
common (DOCOM) terminal. The current which flows through the load is sourced
from the DO terminal. This is shown in Figure 2.5. Connect the negative terminal of
the external source to the DOGND terminal for a correct potential reference.
Figure 2.5 Source (PNP) type digital output signal connection.
Both the voltage of the external source and the load current must be within the range
as specified in the device specifications for proper operation and to prevent the
device from damaging. The expected load current in amps can be calculated by the
following equation.
where...
V
EXT
is the voltage of the external source in volts,
R
LOAD
is the load resistance in ohms, and
R
INT
is the internal resistance of the switch in ohms, which can be found in
the device specifications.
The device is also equipped with flyback diodes and resettable fuses (polyswitches)
for each channel. The flyback diode provides a continuous current path for inductive
load to dissipate energy when the digital output channel becomes OFF. This prevents
the inductive load from generating a large back EMF which may damage the device.
The resettable fuse disconnects the circuit when over-current condition occurs, which
prevents the internal MOSFET switch from begin damaged. It automatically resets
(reconnects circuit) after over-current condition is removed.
Содержание iDAQ-731
Страница 1: ...User Manual iDAQ 731 iDAQ 751 iDAQ 763D Digital I O and Relay Industrial DAQ Modules ...
Страница 8: ...iDAQ 731_751_763D User Manual viii ...
Страница 11: ...Chapter 1 1 Start Using IDAQ 731 751 763D ...
Страница 16: ...iDAQ 731_751_763D User Manual 6 ...
Страница 17: ...Chapter 2 2 Installation and Field Application ...
Страница 28: ...iDAQ 731_751_763D User Manual 18 ...
Страница 29: ...Chapter 3 3 Function Details ...
Страница 42: ...iDAQ 731_751_763D User Manual 32 Figure 3 27 Streaming generation with retrigger ...
Страница 44: ...iDAQ 731_751_763D User Manual 34 ...
Страница 45: ...Appendix A A Specifications ...
Страница 49: ...39 iDAQ 731_751_763D User Manual Appendix A Specifications A 7 Function Block iDAQ 731 iDAQ 751 iDAQ 763D ...
Страница 50: ...iDAQ 731_751_763D User Manual 40 ...
Страница 51: ...Appendix B B System Dimensions ...
Страница 52: ...iDAQ 731_751_763D User Manual 42 B 1 iDAQ Modules ...
Страница 53: ...43 iDAQ 731_751_763D User Manual Appendix B System Dimensions ...