Momentum Modbus Plus 170 PNT Series Podręcznik Użytkownika Pobierz pdf (Strona 208)

I/O Mapping an I/O Bus Network

208

870USE10110 July 2004

Supporting an I/O Map for an I/O Bus Network with Modsoft for Momentum

Components

Introduction The 171 CCS 760 00 and 171 CCC 760 10 processor adapters have an I/O bus

communication port that enables them to control and communicate with network

slave I/O.

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

By default, 512 words are reserved for I/O mapping. This may or may not be the

appropriate memory allocation to support your I/O bus network. A rule of thumb for

roughly estimating the number of words required for I/O mapping is:

16 words for overhead

10 words/module on the network (including both the local and the network I/O)

The idea behind adjusting the memory size is to allow you to completely I/O map

your network while preserving as much user memory as possible for your application

program.

Required

Settings

Be sure that the following parameters are set on the Configuration Overview screen.

Next Step Once you are sure that your Configuration Overview parameters are set properly,

you can access a second I/O Map screen for the I/OBus network (see p. 209).

Parameter Setting

Processor type

12.0 for a 171 CCS 760 00 processor adapter

18.0 for a 171 CCC 760 10 processor adapter

Number of segments 2

I/O map reserved words Enough to support your I/O map

1 2 ... 203 204 205 206 207 208 209 210 211 212 213 ... 375 376

Brak uwag

Momentum Modbus Plus 170 PNT Series Podręcznik Użytkownika Strona 208