Rockwell Automation DeviceNet SEMINAR LAB EX - Manual (Page 60)

60 DeviceNet Seminar Lab Exercises
Publication 1787.6.1 - August 1997
gently and turning the light bulb counter-clockwise.
Notice in data location I:1.1 that bit 12 changes to a 1.
9. Replace the light bulb by gently pressing it into its socket and turning it
clockwise. Bit I1:1/12 goes to a 0.
10. Replace the red lens.
Note: This diagnostic only works if the RediSTATION light is on (the
Start button has been pushed).
11. Press the RediSTATION operator interface’s Stop button.
12. Move the lever up and down on the limit switch connected to the
DeviceLink discrete I/O.
Notice in I:1.1 that bit 7 goes from a 0 to a 1 each time you move the
lever connected to the DeviceLink discrete I/O.
Also notice in I:1.1 that bit 14 goes from a 1 to a 0 each time you put
your hand between the photoeye and the reflector. Bit 15 of I:1.1 goes
from a 0 to a 1 when the photoeye is low on margin.
13. To demonstrate low on margin, swivel the reflector until the green margin
status indicator on the photoeye goes off and the amber indicator is on.
Notice that the red light on the RediSTATION operator interface blinks
and the DL10 Dataliner displays a PHOTO OUT OF MARGIN message.
(Bits 14 & 15 are 1). This message is made available to the SLC-500
processor for control purposes.
14. To verify this operation, put your hand in front of the photoeye and notice
that the RediSTATION operator interface’s light goes solid.
15. Swivel the reflector back so that it is not in low margin. All three LEDs
should be on.