Enter And Test Your Program - Allen-Bradley SLC 500 User Manual

6. Enter and Test Your
Program
Allen-Bradley PLCs
After you test all inputs and outputs and they are functioning
properly, follow the steps below to safely and successfully enter and
test your specific application program. (For extra assistance, see the
Hand-Held Terminal User Manual or your 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, 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
3. Transfer the program into the processor:
a. Place your programming device online.
b. Place the processor into Program mode.
c. Select the download function when using the Hand-Held
Terminal or the restore function when using your
programming software.
4. Verify the online program transfer:
a. Select monitor file function.
b. Cursor through the program to verify that you selected the
right program.
5. Conduct a single-scan program test:
a. Select the monitor file function and place the cursor on the
first rung.
b. Select the Test mode.
c. Select Single-Scan (SSN) test. In this test mode, the processor
executes a single operating cycle, which includes reading the
inputs, executing the ladder program, and updating all data
without energizing the output circuits. However, the monitor
file function will identify output status as if outputs were
enabled.
Timers are also incremented a minimum of 10 milliseconds
each single scan.
Starting Up Your Control System
Publication 1747-UM011C-EN-P - December 2001
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