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Testing the User Program and Storing It on the Memory Submodule
ISTACK
Flags
SUF
Substitution error:
•
Function block call with bad actual parameters
•
Interrupt-driven and time-controlled scanning:
Integral FB call while other integral FB is being
processed
TRAF
Transfer error:
•
Data block operation programmed in which
data word number exceeds data block length
•
Data block operation programmed without first
opening DB
ZYK
Cycle time exceeded:
The program scan time exceeds the cycle
monitoring time. Causes:
•
Program too long
•
Too many interrupts
14.3
Program Errors
Two types of program errors are flagged in the ISTACK:
•
Errors detected by the compiler during program compilation (compiler error "NNN")
•
Errors detected during the program run (runtime errors "SUF" and "TRAF")
14.3.1 Determining the Error Address
Program Errors Detected During Compilation
When a compiler error occurs, the error address provided in the ISTACK is correct, i.e. the STEP
address counter points to the absolute memory address of the STEP 5 statement immediately
preceding the statement which caused the S5-95F to go to "STOP".
The relative STEP address counter (REL-SAC) gives the address of the STEP 5 statement
immediately preceding the statement which caused the PLC to go to STOP relative to the start of
the block.
14-10
Table 14-6. Interrupt Analysis (continued)
Cause of Error
Corrective Measures
Change actual parameters
Disable interrupts
Eliminate program error
(refer to the Programmer
Manual)
Check program for
continuous loops and/or
shorten program
EWA 4NEB 812 6210-02
S5-95F
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