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PLC System Start-Up and Program Test
4.3.2
Search
The "Search" function is used to find operands or symbols in the STEP 5 program.
This function makes it easier to handle longer control programs. The search function is executed
differently in the individual programmers and is described in detail in the relevant manual.
4.3.3
"Program Check" Test Function
This programmer function causes the CPU to scan a random block step-by-step. When this
function is called, program scanning is stopped at a specific point. This breakpoint (a statement in
the program) is indicated by the cursor. The PLC scans the program up to the selected statement.
The current signal states and the RLO are displayed up to the selected statement.
You can scan the program in sections by shifting the breakpoint as you require.
Program scanning takes place as follows:
•
All jumps in the block called are traced.
•
Blocks called are executed without delay.
•
Program scanning is terminated automatically when block end (BE) is reached.
The following applies during Program Check:
•
Neither operating mode LED is lit up.
•
Inputs and outputs are not scanned. The program writes to the PIQ and reads the PII.
•
All outputs are switched off. The "BASP" LED lights up.
Corrections are not possible during Program Check. However, the following test and PLC
functions can be executed:
•
Input and output (program modifications are possible)
•
Direct signal status display (STATUS VAR)
•
Forcing outputs and variables (FORCE, FORCE VAR)
•
Information functions (ISTACK, BSTACK)
If the Program Check function is interrupted by PLC or program errors, the PLC goes into the
STOP mode and the corresponding LED lights up on the CPU control panel.
Consult the relevant manual for information on calling the Program Check function on a
programmer (not on the PG 605).
4-8
S5-115U Manual
EWA 4NEB 811 6130-02b
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