Allen-Bradley 1785-KE User manual

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Table of Contents

Table of Contents##
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Table of Contents ###
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After reading this chapter, you should know:
if this manual contains the information you need
where to locate information in this manual
where to locate information on related products
This manual describes the 1785-KE Data Highway Plus RS-232-C
Interface Module. It gives you procedures for:
installing the 1785-KE
troubleshooting your 1785-KE
For more information on programming and troubleshooting Data Highway
Plus and Data Highway interface modules, refer to the Data Highway/Data
Highway Plus Protocol and Command Set Reference Manual (publication
1770-6.5.16).
You should read this manual before attempting to install or use the
1785-KE. We assume that you are already familiar with:
RS-232-C standards and practices
your RS-232-C device or modem
Allen-Bradley Programmable Logic Controllers (PLCs)
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1–3
This manual describes both Series A and Series B versions of the 1785-KE
module. Table 1.A lists the Series B enhancements to the module. These
features were not available on the Series A version of the module. Where
we describe these features later in the manual, we note that they are only
available on the Series B version of the module. You can see the catalog
number and the series level of the module on the name plate on the side of
the module.
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<&',&+(A(B-"#-6&C&-%+
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-./01.&2334.""#$%&5*6*7#,#18
9:+,,&;+6,.<&=6.4*1#0$>
?$(*[email protected]&@0//+$#@*1#0$"&@*6*7#,#18
A04&*66,#@*1#0$"&#$B0,B#$%&60#$1&10&60#$1
/03./&,#$C"D
-./01.&2334.""#$%&5*6*7#,#18
9E*,A&;+6,.<&=6.4*1#0$>
?$(*[email protected]&@0//+$#@*1#0$"&@*6*7#,#18
A04&*66,#@*1#0$"&#$B0,B#$%&/+,1#3406
/03./&,#$C"D
The Series B version of the 1785-K module uses different communication
option switches and has a different front cover and Data Highway Plus
connectors than the Series A version. Information on setting the Series A
is included in Appendix C for reference.
In this manual, we use the following terms:
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1–4
In this manual, you will see:
WARNINGS to tell you where you may be injured if you do not follow
procedures properly
CAUTIONS to tell where equipment may be damaged if you do not
follow procedures properly
Important notes that stress information that is critical to your
understanding and use of the product
The 1785-KE Data Highway Plus RS-232-C Interface Module is part of
the Data Highway Plus product family. Related products include:
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1–5
For more information on the 1785-KE and the Data Highway Plus
network, refer to the following documents:
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;*1*&E#%(G*8&H,+"&=B.4B#.G&H403+@1&;*1* QRUVLMDX
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The publications in the table above are available from Allen-Bradley.
Contact your local Allen-Bradley sales office for more information.
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In this chapter, we give you an overview of the 1785-KE module and how
it interfaces with a Data Highway Plus network.
The 1785-KE module is a communication interface that links an intelligent
RS-232-C (asynchronous) device to an Allen-Bradley Data Highway Plus
network. The 1785-KE gives you a choice of full duplex (unpolled) or
half duplex (polled) protocol on its asynchronous link.
Figure 2.1 shows the 1785-KE module’s hardware features:
diagnostic indicators
connector for the Data Highway Plus
connector for the T50 Industrial Terminal
connector for an RS-232-C device
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Data Highway Plus is a local area network (LAN) that allows peer-to-peer
communication among up to 64 nodes. You use Data Highway Plus when
you want to connect a small number of nodes on a common link.
Data Highway Plus provides easy re-configuration and expansion if you
want to add more nodes later.
Typically, you would use Data Highway Plus to connect PLC-5s that need
to communicate with each other frequently. For example, you would use
Data Highway Plus to connect a small group of PLC-5s (approximately 10
nodes or less) involved in a single integrated process. Larger links, or those
in looser configurations, could use a Data Highway as a common backbone
network.
Communication on a Data Highway Plus involves:
a physical link layer
software layers
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