Publication 1734-UM002C-EN-P - July 2003
What is the 1734-ADN(X) Adapter?
2-19
Overview of the Communication Process
In a typical configuration, the adapter acts as an interface between a
DeviceNet scanner (e.g., 1756-DNB) and POINT I/O modules. The
example graphic below shows information transferred from a
1756-DNB to POINT I/O modules.
Four data transfers are shown in the diagram, including:
1.
Scanner to adapter
2.
Adapter to I/O modules
3.
I/O modules to adapter
4.
Adapter to scanner
Because the adapter simultaneously resides on the DeviceNet network
and on PointBus, it serves as a slave to the processor (i.e., #1 & 4) and
a master to the I/O modules (i.e., #2 & 3).
The four data transfers are not necessarily sequential.
IMPORTANT
Although information is exchanged between the
Logix5550 and 1756-DNB, this diagram (nor this
chapter) is not designed to explain such an
exchange.
computer with PLC
programming software
ControlNet network
Logix5550 controller
1784-PCD
PCMCIA card
1734-ADN adapter
DeviceNet network
computer with
RSNetWorx for
DeviceNet software
POINT I/O modules
42409
The computers and PCMCIA
card shown in the diagram
are required to configure the
processor, adapter and I/O
modules.
Although the PCMCIA card
is used in this example, you
can use other
communications cards, such
as PCID and KFD cards.
Key Points About Scanner to Adapter Transfer (
Step 1
)
1.
Scanner initiates transfer
2.
Scanner uses DeviceNet I/O messaging to write
data to adapter. Data may contain:
•
device output data
•
configuration data
Key Points About Adapter to Output Module Transfer (
Step 2)
1.
Adapter initiates transfer
2.
Adapter produces data for I/O module to consume.
Data may contain:
•
device output data
•
configuration data
Key Points About Input Module to Adapter Transfer (
Step 3
)
1.
Adapter consumes data I/O module has produced.
Data may contain:
•
device input data
•
status data
Key Points About Adapter to Scanner Transfer (
Step 4
)
1.
SDN consumes I/O data produced by adapter.
Data may contain:
•
device input data
•
status data
The Logix5550 controller sits in the backplane.
The 1756-DNB contained in the controller
communicates with the 1734-ADN(X).
Содержание 1734-ADNX
Страница 1: ...POINT I O DeviceNet Adapter 1734 ADN 1734 ADNX User Manual...
Страница 4: ...Publication 1734 UM002C EN P July 2003 Summary of Changes 2 Notes...
Страница 14: ...Publication 1734 UM002C EN P July 2003 Table of Contents iv...
Страница 80: ...Publication 1734 UM002C EN P July 2003 A 4 Specifications Notes...
Страница 112: ...Publication 1734 UM002C EN P July 2003 B 32 1734 ADNX Quick Start Notes...
Страница 128: ...Publication 1734 UM002C EN P July 2003 D 14 Default Data Maps...
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