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Example: Connecting Actuators to the Outputs

Inductive loads can be connected without a protection diode on

TIP

the load. However, Rockwell Automation strongly recommends

that a protection diode be fitted directly to the load to suppress

any interference voltage. A 1N4004 diode is recommended.

The digital outputs can be pulsed with the safety-related digital inputs of the same

device. This enables short-circuit or line break monitoring to be carried out (e.g.

EMERGENCY STOP buttons to conform to Cat. 4 in EN954-1).

ATTENTION

For more information on output wiring, see the GuardPLC™

TIP

System User Manual, publication number 1753-UM001.

Controller Tests

In addition to the tests for safety, the controller tests the supply voltage and

controller temperature.

Supply Voltage Tests

The supply voltage (24V dc) is monitored and the alarm and system shutdown are

controlled according to the voltage levels listed below.

Voltage Level

19.3 to 28.8V

< 19.3V

< 15.4V

< 13.0V

Pulse outputs may not be used as safety related outputs.

System Condition

Normal

alarm state 1 (internal variables are written)

alarm state 2 (prepares for shutdown)

switched off

GuardPLC™ 1600 Controllers

Publication 1753-IN001B-EN-P - March 2004