Momentum Modbus Plus 170 PNT Series Guia do Utilizador descarregar pdf (Página 166)

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101

Using the I/O Bus Port

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870USE10110 July 2004

Network Status Indication in the M1 Ethernet Module

Overview The M1 Ethernet Module can provide I/O bus network status via the Module Status

function in the programming panel or by a STAT element in user logic. The fourth

word of the status element contains information regarding the integrity of the

network.

Operation The I/O bus status word contains a valid value only when the processor is running.

A zero value indicates that normal I/O bus communication is occurring.

A non-zero value indicates a problem.

Failure

Indication

If there is a communications error, bit values in the I/O bus status word contain

information on the failure mode, as follows.

Status

Word

Values

Description

Bits 0 - 14 These bits contain a value from 1 to 255, signifying the network position of the

module that cannot be reached. For example, a value of 8 indicates a

communications failure in accessing the 8th module on the network.

Bit 15 This bit contains a value of 0 or 1.

A value of zero indicates a general communication failure, for example, no power

to the module or a break in its input cable.

A value of 1 indicates that communication is possible, but the I/O bus ID received

from the module does not match the module type contained in the traffic cop for

that position.

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