Rockwell Automation 1753-L28BBB-M_P GuardPLC 1600 Controllers - Manual (Page 10)

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Rockwell Automation Publication 1753-IN001C-EN-P - June 2010
Line Control
Line control is a short-circuit and line-break monitoring system (that is, E-stop inputs) that can
be configured for the GuardPLC 1600 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 controller 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. When a fault occurs, all outputs are switched
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