Rockwell-automation 1753-IB20XOB8 GuardPLC Digital Input/Output Module User Manual download pdf (Page 10)

10 GuardPLC Digital Input/Output Module

Rockwell Automation Publication 1753-IN003C-EN-P - June 2010

Line Control

Line control is a short-circuit and line-break monitoring system, for example, E-stop inputs that

can be configured for the GuardPLC system. Up to eight digital outputs (DO1…DO8) can be

configured as pulsed outputs. The example below shows two pulse outputs connected to the

digital inputs (DI) of the same system. As a result, the connections to the digital inputs (DI) are

monitored.

Inputs are set to 0, a fault code is generated, and the FAULT status indicator is on when:

• a short-circuit occurs between two parallel connections.

• two connections are reversed.

• earth fault occurs on one of the lines (only with earthed reference pole).

• a line breaks or one of the contacts opens (that is, when one of the E-stop off switches is

pressed in the example above).

Safety-related Digital Outputs

The module has eight digital outputs (DO1…DO8) whose status is indicated via status

indicators.

An output is in a safe state when it is de-energized. If a fault occurs, all outputs are turned off.

Outputs 1…3 and 5…7 can have a load of 0.5 A at an ambient temperature of 60 °C (140 °F).

Outputs 4 and 8 can each have a load of 1 A at an ambient temperature of 60 °C (140 °F), or up

to 2 A at an ambient temperature of 50 °C (122 °F).

With an overload, one or all of the outputs are turned off. When the overload is eliminated, the

outputs are activated again according to the specified value.

Although the external line of an output is not monitored, a short-circuit will be indicated.

IMPORTANT

For information on how to configure inputs and outputs for line control, see the

GuardPLC Controller Systems User Manual, publication 1753-UM001

Emergency OFF 1

Emergency OFF 2

DO 1 2

DI 1 2

DI 3 4

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 19 20

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Rockwell-automation 1753-IB20XOB8 GuardPLC Digital Input/Output Module User Manual Page 10