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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
15
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