ALLEN BRADLEY 1747-L551 PLC Processor

Starting Up Your Control System
8–7
5. Test Your Outputs
After you test all inputs, and have determined that they are
functioning properly, test the outputs following these steps:
1. Refer to page 8–2 to insure no motion will occur when any
controller output is energized.
2. Place the controller in the Program mode.
3. Create an output test rung as shown below for each output
module configured.
MOV
SOURCE B3: “XX”
DEST O0: “XX”. “Y”
Let “XX” represent slot number of the output currently selected.
“Y” represents output word identifier. This rung moves a word of
data from the bit file to the output file.
4. Save the output test program and current controller configuration.
5. Transfer the output test program to the processor.
6. Put the controller in the Run mode.
7. Monitor the data in data file B3 on the programming device
display.
8. Enter B3: “XX” at address prompt to select the output to be
tested. “XX” represents the output slot number.
9. Enter 1 at data prompt for the address that corresponds to the bit
in the output word.
10.Observe the output status LED and the output device.
The output status LED should turn on. The output device should
be energized (unless you disconnected it to prevent machine
motion).
11. Reset the data value back to zero for selected address and both the
output status LED and output device should de-energize.
12.If the status LED and the output device correspond to data
settings in steps 10 and 11, repeat steps 8 through 11 for each
output.
If the status LEDs and output device states do not correspond to
the data settings in steps 9 and 11, follow the recommended
output troubleshooting steps in the next section.
Publication 1747-6.2