Momentum Modbus Plus 170 PNT Series Guia do Utilizador Página 304

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I/O Mapping an I/O Bus Network
304
870USE10110 July 2004
Supporting an I/O Map for an I/OBus Network
Introduction Three processor adapters have an I/O bus communication port that enables them to
control and communicate with other network slave.
171 CCS 760 00
171 CCC 760 10
171 CCC 960 20
171 CCC 960 30
If you are using I/O bus to control network I/O, you need to write an I/O map in your
configuration. This section describes the configuration parameters required to
support an I/O map for I/O bus.
I/O Map
Reserved Words
Be sure that you have reserved enough words for I/O mapping to support your I/O
bus network. The default setting is 144 words. To estimate the number of words you
require, allow:
16 words for overhead
10 words/module on the network (including both the local and the network I/O)
Allot sufficient memory to completely I/O map your network, while preserving as
much user memory as possible for your application program.
Number of
Segments
Be sure that the number of segments is set to 2. If you have changed this setting to
1, you will not be able to support an I/O bus network
Next Step Once you are sure that your Configuration Overview parameters are set properly,
you can access an I/O map screen for an I/O bus network (see p. 305).
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