S5-100U Diagnostics and Troubleshooting
Display
Figure 5-7. Example of a “BSTACK” Display on the PG 615
*BSTACK
BLOCK REL. ADDR. DB
PB 4 0010 5
PB 2 0004 5
OB 1 0006
0505
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Block type and
block number
Insignificant ID
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Number of the currently
valid data block
Relative return
address
This display indicates that a block was called up via the path of OB1 PB2 PB4. During the
processing of this block, the programmable controller went into the STOP mode. The STOP can
have been caused by one of the following:
• A change of the operating mode switch to the STOP position
• The exceeding of the cycle time
• An error in the STEP 5 block
Refer to the ISTACK for the block that was being processed when the error occurred and for the
cause of the error.
EWA 4NEB 812 6120-02
5-13
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