
6. LADDER DIAGRAM MONITOR
AND EDITOR
B–61863E/15
PMC–NB6 MANIPULATION
750
Return key [<] or [NEXT NET] soft key analyzes current editing net, and
produce executable object of the net: new object of LADDER program is
not yet effective at this time. If some error is found through the analysis,
an error message is displayed, and cursor may indicate where the error is
detected, according to type of error.
Following table shows error messages expected at net analysis and their
meanings and solutions.
Error message Meaning and solution
ALL COIL MUST
HAVE SAME IN-
PUT
Meaning:
When a net contains more than one coil, the coils
should not have any contact beside them that affects
only one of the coils.
Solution:
Left terminals of all coils in a net must be connected to
same input point.
BAD COIL LOCA-
TION
Meaning:
Coil is located in bad position.
Solution:
Coil can be located only at rightmost column. Any coil
located at other place must be erased once, and
place necessary coils in correct place.
BAD CONDITION
Meaning:
Some condition input of functional instruction is not
connected correctly.
Solution:
Check the connection of all condition inputs of the
functional instruction. Especially for functional instruc-
tion that has more than one condition input, check if
connections to condition inputs interfere with each
other.
FUNCTION AF-
TER DI-
VERGENCE IS
FORBIDDEN
Meaning:
Functional instruction is used in output section of net:
refer to next section for detail.
Solution:
Functional instruction can not be used in output sec-
tion of net. If necessary, divide the net into plural nets.
NET IS TOO COM-
PLICATED
Meaning:
Net is too complicated to analyze.
Solution:
Examine every connection, and find unnecessarily
bending connection, or coils that are connected to
different point.
NO CONNECTION
Meaning:
There is signal connected to nowhere.
Solution:
Find gap that is expected to be connected, and cor-
rect the connection.
6.3.5
Error Messages and
Their Solutions