AB Quality GuardPLC 1600 Installation Instructions Manual - Controller Tests
GuardPLC™ 1600 Controllers 15
Publication 1753-IN001B-EN-P - March 2004
Example: Connecting Actuators to the Outputs
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).
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.
TIP
Inductive loads can be connected without a protection diode on
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.
ATTENTION
Pulse outputs may not be used as safety related outputs.
TIP
For more information on output wiring, see the GuardPLC™
System User Manual, publication number 1753-UM001.
Voltage Level
System Condition
19.3 to 28.8V
Normal
< 19.3V
alarm state 1 (internal variables are written)
< 15.4V
alarm state 2 (prepares for shutdown)
< 13.0V
switched off
DO 1
DO 2
DO 3
DO 4
L-
L-