Momentum Modbus Plus 170 PNT Series Guia do Utilizador descarregar pdf (Página 27)

Modbus Plus for DIO Servicing

870 USE 103 00 May 2001 27

Network Configuration

Overview This section contains guidelines for configuring a Modbus Plus network for

distributed I/O servicing.

Limit Types of

Devices on

Network

To ensure deterministic timing, the network should consist of just one programmable

controller node and the required group of I/O nodes.

Non-I/O devices, such as additional controllers, programmers, or operator

interfaces, should communicate with the I/O network controller through a separate

Modbus Plus network or other type of connection.

Maximum

Configuration

The table below summarizes the Modbus Plus network’s maximum configuration for

a distributed I/O application consisting of Momentum products.

Parameter Specification

max. number of nodes 64 including Controller

max. distance between two nodes 450 m (1500ft)

min. distance between two nodes 3 m (10ft)

max. length of network 450 m (1500ft)

max. number of data words (16-bit words) 500 input, 500 output

max. number of I/O points (16 bits/word) 8000 input, 8000 output

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Momentum Modbus Plus 170 PNT Series Guia do Utilizador Página 27