ALLEN BRADLEY 1747-L551 PLC Processor

8–10
Starting Up Your Control System
D. Simulate the input conditions necessary to execute the
current monitored rung of the program. If it is not practical
to manually activate the input device, use the force function
to simulate the proper condition.
!
ATTENTION: Never reach into a machine to actuate
a device, unexpected machine operation could occur.
E. Activate a single operating scan as outlined in the
programming device user manual.
F. Verify the intended effects on the output instructions for that
rung and overall program logic effects.
G. Select the next program rung and repeat test procedures as
listed above until the entire program has been tested.
6. Conduct a continuous scan program test.
Once the individual single scan rung tests have been completed
and proper program operation verified, a continuous scan test is
appropriate before motion checkout.
The mode simulates the controller Run mode without energizing
the external outputs.
Use the following steps to further verify proper program and
system function operation.
A. Remain or return to an online condition with the processor.
B. Monitor the file.
C. Select Test mode.
D. Select the Continuous Scan test.
E. Simulate the input conditions necessary to execute system
functions.
F. Verify the intended operation of each system function and the
effects of other system functions.
!
ATTENTION: Never reach into a machine to actuate
a device, unexpected machine operation could occur.
Publication 1747-6.2