Advantech PCI-1752, Быстрый старт

Страница: 36 / 62

Chapter 3
– 29 – PCI-1752/54/56 User’s Manual
Advantech Co., Ltd.
www.advantech.com
Fig. 3-8 Isolated Digital Output Connection
3.5 Field Wiring Considerations
When you use the PCI-1752/1754/1756 to acquire data from outside,
noises in the environment might significantly affect the accuracy of
your measurements if due cautions are not taken. The following
measures will be helpful to reduce possible interference running signal
wires between signal sources and the PCI-1752/1754/1756.
• The signal cables must be kept away from strong electromag-
netic sources such as power lines, large electric motors, circuit
breakers or welding machines, since they may cause strong
electromagnetic interference. Keep the analog signal cables
away from any video monitor, since it can significantly affect a
data acquisition system.
• If the cable travels through an area with significant electromag-
netic interference, you should adopt individually shielded,
twisted-pair wires as the analog input cable. This type of cable
has its signal wires twisted together and shielded with a metal
mesh. The metal mesh should only be connected to one point at
the signal source ground.
• Avoid running the signal cables through any conduit that might
have power lines in it.
• If you have to place your signal cable parallel to a power line
that has a high voltage or high current running through it, try to
keep a safe distance between them. Or you should place the
signal cable at a right angle to the power line to minimize the
undesirable effect.
ISO 5V
R
R
R
Internal External
R R
E1
V
DC
5~40V
DC
IGND
IDO0....31/63
COM
Load0....31/63