Diagnostics and Trouble Shooting
S5-90U/S5-95U
Runtime Errors
If a runtime error has occurred, the STEP address counter specifies the initial address of the
errored block.
The relative STEP address counter (REL-SAC) has the value "0000".
In the case of the "SUF" and "TRAF" runtime errors, you can use a "trick" to determine the correct
address of the error (for S5-95U only).
Proceed as follows:
Switch the operating mode switch of the PLC to "STOP".
Select the "STATUS"diagnostic function on the programmer to check the errored block.
Switch the PLC from "STOP" to "RUN".
Call up the ISTACK display on the programmer when the PLC has entered the "STOP" mode.
The STEP address counter shows the absolute memory address following the address at which the
PLC entered the "STOP" state.
The REL-SAC specifies the relative address within a block following the address at which the PLC
entered the "STOP" state.
5.4.2 Program Tracing with the "BSTACK" Function
During program processing, the following information about jump operations is entered in the block
stack (BSTACK).
•
The data block that was valid before program processing exited a block.
•
The absolute block start address. It specifies the memory address of the block start in the
program memory.
You can call up this information with the "BSTACK" programmer function in the "STOP" mode if a
fault has caused the programmable controller to go into the "STOP" mode. "BSTACK" then
reports the status of the block stack at the time the interruption occurred.
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