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S5-115U Manual
Example:
You have entered DB1 as follows; the shaded area represents an error.
0:
KS
='DB1 TFB: OB13 100 ; SDP:';
12:
KS
=' WD 3000 ; ERT: ERR MW1 ';
24:
KS
='; END';
26:
The ISTACK indicates the following as a result of this error:
•
The absolute (error) address:
•
The relative (error) address:
To locate the error accurately in your DB1, you must convert the relative byte address given as a
hexadecimal number into a decimal word address.
The reason: The programmer counts the contents of a DB decimally and in words.
The SAC counts the contents of a DB hexadecimally and in bytes.
001C
=
28
H
D
Hexadecimal
Decimal
byte address
byte address
It follows that:
The error is in word address 14. In our example, address 14 (data word 14 and 15) is occupied by
argument "3000". The entry "3000" is an error; reason: overrange.
11.3.6 Transferring the DB1 Parameters to the PLC
The CPU processes DB1 only after manual cold restart or after automatic cold restart after power
restore.
You must perform a cold restart anytime you make changes to DB1. You can perform a cold
restart by switching from:
•
POWER OFF to POWER ON
or from
•
STOP to RUN
The programmable controller accepts the parameters from DB1 and stores them in the system
data area.
Note
The programmable controller remains in the STOP mode if a parameter assignment
error is found during start-up
ISTACK displays a DB1 addressing error.
EWA 4NEB 811 6130-02b
The decimal number at the beginning of each
input line is the word address of the first user-
programmable character in that line. Each word
consists of two characters (two bytes)
Figure 11-7. DB1 with Parameter Error
B14C
H
001C
H
28
:
D
.
The red LED lights up on the operator panel and
(absolute SAC)
(relative SAC)
2
=
14
D
D
Decimal
word address
Integral Blocks
11-53
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