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参数资料
| 型号： | HCPL-7721#500 |
| 厂商： | AGILENT TECHNOLOGIES INC |
| 元件分类： | 光电耦合器 |
| 英文描述： | 1 CHANNEL LOGIC OUTPUT OPTOCOUPLER, 25 Mbps |
| 封装： | 0.300 INCH, SURFACE MOUNT, DIP-8 |
| 文件页数： | 4/18页 |
| 文件大小： | 437K |
| 代理商： | HCPL-7721#500 |
12
Optical Isolation for Field Bus
Networks
To recognize the full benefits of
these networks, each recommends
providing galvanic isolation using
Agilent optocouplers. Since
network communication is bi-
directional (involving receiving
Figure 15. Typical field bus communication physical model.
data from and transmitting data
onto the network), two Agilent
optocouplers are needed. By
providing galvanic isolation, data
integrity is retained via noise
reduction and the elimination of
false signals. In addition, the
network receives maximum
protection from power system
faults and ground loops.
Within an isolated node, such as
the DeviceNet Node shown in
Figure 16, some of the node’s
components are referenced to a
ground other than V- of the
network. These components could
include such things as devices with
serial ports, parallel ports, RS232
and RS485 type ports. As shown in
Figure 16, power from the network
is used only for the transceiver and
input (network) side of the
optocouplers.
Isolation of nodes connected to any
of the three types of digital field
bus networks is best achieved by
using the HCPL-772X/072X
optocouplers. For each network,
the HCPL-772X/072X satisify the
critical propagation delay and
pulse width distortion require-
ments over the temperature range
of 0
°C to +85°C, and power supply
voltage range of 4.5 V to 5.5 V.
Digital Field Bus Communication
Networks
To date, despite its many draw-
backs, the 4 - 20 mA analog
current loop has been the most
widely accepted standard for
implementing process control
systems. In today’s manufacturing
environment, however, automated
systems are expected to help
manage the process, not merely
monitor it. With the advent of
digital field bus communication
networks such as CC-Link,
DeviceNet, PROFIBUS, and Smart
Distributed Systems (SDS), gone
are the days of constrained
information. Controllers can now
receive multiple readings from
field devices (sensors, actuators,
etc.) in addition to diagnostic
information.
The physical model for each of
these digital field bus communica-
tion networks is very similar as
shown in Figure 15. Each includes
one or more buses, an interface
unit, optical isolation, transceiver,
and sensing and/or actuating
devices.
CONTROLLER
TRANSCEIVER
OPTICAL
ISOLATION
BUS
INTERFACE
TRANSCEIVER
OPTICAL
ISOLATION
BUS
INTERFACE
TRANSCEIVER
OPTICAL
ISOLATION
BUS
INTERFACE
TRANSCEIVER
OPTICAL
ISOLATION
BUS
INTERFACE
TRANSCEIVER
OPTICAL
ISOLATION
BUS
INTERFACE
FIELD BUS
XXXXXX
YYY
SENSOR
DEVICE
CONFIGURATION
MOTOR
STARTER
MOTOR
CONTROLLER
NODE/APP SPECIFIC
uP/CAN
HCPL
772x/072x
HCPL
772x/072x
TRANSCEIVER
LOCAL
NODE
SUPPLY
5 V REG.
NETWORK
POWER
SUPPLY
V+ (SIGNAL)
V– (SIGNAL)
V+ (POWER)
V– (POWER)
GALVANIC
ISOLATION
BOUNDARY
AC LINE
DRAIN/SHIELD
SIGNAL
POWER
Figure 16. Typical DeviceNet Node.
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