Rockwell Automation 1747-L40 SLC 500 Fixed Hardware Style - Manual (Page 81)

Chapter 6
Starting Up Your Control System
6–8
6. Check your specifications.
A. Verify that all power supplies used are within the specified operating
ranges of the I/O circuits and loads.
B. Check that the specified load current is greater than the minimum load
current specified for the output circuit. (Leakage current from the
output circuit may prevent you from turning off a low current load.)
C. Check that the specified load current is less than the maximum load
current of the output circuit.
D. Make sure that the sum of all the load currents is equal to or less than
the power supply capacity.
7. Restore power to the I/O circuits and test the output. If the preceding
measures have not corrected the problem, turn off the I/O power and
disconnect the load. Connect the load directly to the I/O power supply.
You should be able to operate the load by turning the power supply on
and off.
If you can operate the load, and the load is within the specified operating
range of the output circuit, the output circuit is not functioning properly.
Replace the fixed controller or output module as necessary.
If you cannot operate the load by turning the power supply on and off, the
load is not operating properly and it should be replaced.
For more information on output troubleshooting, refer to page 8–10.
After you test all inputs and outputs and they are functioning properly, we
recommend the following steps to safely and successfully enter and test your
specific application program. (For extra assistance, see the Hand–Held
Terminal User Manual or the Advanced Programming Software User
Manual.)
1. Verify the offline program.
After the program has been entered in the offline edit file mode, program
verification may begin.
Remaining in the offline edit file mode you may use the cursor keys
and/or search function of your programming device to inspect every
instruction and rung for errors.
2. Check your written program, rung for rung, against the program entered
into the offline memory. The most common errors found in program
entry are:
•
incorrect addressing of instructions
•
omission of an instruction
•
more than one output instruction programmed using the same address
6. Enter and Test Your Program