National Instruments cFP-DO-403 用户手册
© National Instruments Corp.
7
[c]FP-DO-403
mount the flyback diode within 18 in. of the load. Figure 5 shows
a flyback diode connected to an inductive load.
a flyback diode connected to an inductive load.
Figure 5. Connection to Inductive Load with Flyback Diode
Although the [c]FP-DO-403 contains flyback diodes to prevent
excessively high voltage from damaging the module, National
Instruments recommends the use of an external protection circuit
across any inductive load.
excessively high voltage from damaging the module, National
Instruments recommends the use of an external protection circuit
across any inductive load.
Status Indicators
The [c]FP-DO-403 has two green status LEDs, POWER and
READY. After you insert the FP-DO-403 into a terminal base
or the cFP-DO-403 into a backplane and apply power to the
connected network module, the green POWER indicator lights
and the [c]FP-DO-403 informs the network module of its presence.
When the network module recognizes the [c]FP-DO-403, it sends
initial configuration information to the [c]FP-DO-403. After the
module receives this initial information, the green READY
indicator lights and the [c]FP-DO-403 is in normal operating
mode.
READY. After you insert the FP-DO-403 into a terminal base
or the cFP-DO-403 into a backplane and apply power to the
connected network module, the green POWER indicator lights
and the [c]FP-DO-403 informs the network module of its presence.
When the network module recognizes the [c]FP-DO-403, it sends
initial configuration information to the [c]FP-DO-403. After the
module receives this initial information, the green READY
indicator lights and the [c]FP-DO-403 is in normal operating
mode.
In addition to the green POWER and READY indicators, each
channel has a numbered, green output state indicator, which lights
when the channel is in the ON state.
channel has a numbered, green output state indicator, which lights
when the channel is in the ON state.
Isolation and Safety Guidelines
Caution
Read the following information before
attempting to connect the [c]FP-DO-403 to any circuits
that may contain hazardous voltages.
that may contain hazardous voltages.
This section describes the isolation of the [c]FP-DO-403 and its
compliance with international safety standards. The field wiring
connections are isolated from the backplane and the inter-module
communication bus. The isolation barriers in the module provide
compliance with international safety standards. The field wiring
connections are isolated from the backplane and the inter-module
communication bus. The isolation barriers in the module provide
Flyback Diode
V
OUT
Load
V or V
SUP