Siemens S5-100U User Manual page 89

Simatic s5 programmable controller

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Diagnostics and Troubleshooting

Table 5-2. ISTACK Output (Bytes 17 to 32) [continued]

2nd nesting level

3rd nesting level

Nesting depth (0 to 6)

1st nesting level

Start address of the data block (high)

Start address of the data block (low)

Block stack pointer (high)

Block stack pointer (low)

Step address counter (high)*

Step address counter (low)*

Operation register (high)

Operation register (low)

ACCU 2 (high)

ACCU 2 (low)

ACCU 1 (high)

ACCU 1 (low)

The absolute memory address of the next statement to be processed from the faulty block is displayed.

If the step address counter displays a DB1 address, then there is a DB1 parameter setting error (see

section 9.1).

The PG 615 displays the cause of an interrupt as plain text before the ISTACK is output.

EWA 4NEB 812 6120-02

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