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102 • Fieldbus ECO-Coupler 750-343

Fault Behavior

WAGO-I/O-SYSTEM 750

PROFIBUS

3.1.11 Fault Behavior

3.1.11.1 Fieldbus Failure

A fieldbus failure has occurred when the master is switched off or the bus

cable is interrupted. A fault in the master can also lead to a fieldbus failure.

The red BF-LED lights up.

The failure of the fieldbus can activate the substitute value of the I/O modules.

During configuring of the inputs and outputs a substitute value can be laid

down for each channel.

Substitute Value

Strategy

Value (bit orientated)

Digital Output Modules

Value (byte orientated)

Analog Output Modules

Minimum value 0 0 or 4 mA, 0 V

Maximum value 1 20 mA, 10 V

Substitute value 0 or 1 0/4 ... 20 mA, -10 ... +10 V

Stop internal bus Behavior determined by I/O module

The value is entered in the output process image by the Coupler. With I/O

modules with byte orientated data width, e.g. the pulse width module, the

substitute value is determined via the value area.

As soon as the fieldbus is active the process data is transmitted and the output

correspondingly set in the nodes.

3.1.11.2 Internal Bus Fault

An internal bus fault is created, for example, if an I/O module is removed. If

this fault occurs during operation the output modules behave in the same

manner as an I/O module stops.

The I/O-LED blinks red. The slave generates a detailed fault message.

Once the internal bus fault has been fixed the Coupler starts up automatically

in accordance with the configured restart routine. The process data transfer is

then restarted and the outputs reset in the nodes.

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Sharp DP-750 Manual de Serviço Página 102