Siemens SIMATIC S5-90U, Системное руководство

Страница: 115 / 622

S5-90U/S5-95U Diagnostics and Trouble Shooting
Example: Program scanning was interrupted at function block FB2. The programmable controller
went into the "STOP" mode with the error message "TRAF" (because of incorrect DB
access, e.g., DB5 is two words long, DB3 is ten words long).
"BSTACK" lets you determine the path used to reach FB2 and which DB was open at
the time of call up. "BSTACK" contains the three (marked) block start addresses.
Figure 5-4. Program Tracing with "BSTACK"
06
OB1
04 JU PB2
02
00 JU PB1
PB1
xx BE
00
PB2
04
02 JU PB4
00 C DB5
xx BE
18 BE
PB3
16 JU FB2
00 C DB3
PB4
08 JC FB2
00
10
xx BE
FB2
00
2A L DW4
xx BE
a a a a a a a a a a a
a a a a a a a a a a a
a a a a a a a a a a a
a a a a a a a a a a a
a a a a a a a a a a a
a a a a a a a a a a a
Interrupt with the
"TRAF" error
message
08 JC PB3
xx BE
10
a a a a a a a a a a
a a a a a a a a a a
a a a a a a a a a a
a a a a a a a a a a
a a a a a a a a a a
a a a a a a a a a a
a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a
Table 5-8. BSTACK Display
Block No. Block Add. Return Add. Rel. Add. DB No. DB Add.
PB 4 0174 0174 0000 DB 5 0164
PB 2 011A 011A 0000 DB 5 0164
OB 1 0152 0152 0000
BLOCK STACK
The above BSTACK display indicates a block was called up via the path of OB1 PB2 PB4.
During processing of this block, the programmable controller went into the "STOP" mode.
DB5 was valid when this block was called.
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 6115-02b
5-11