Siemens SIMATIC S5-100U System Manual page 91

Simatic s5 series cpu 100/102/103

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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).

EWA 4NEB 812 6120-02b

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