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1. PLC Development Environment Using GX Developer
1.7 Error Status
- 50 -
Status Message Cause Remedy
4070 The program before correction
differs from the registered
program.
A ladder command outside the
specification is included.
Perform verification to identify
the command that is the cause
of the problem.
When the "Read from PLC" is
executed:
The data outside the
specification is included in
the specified file.
A ladder or message in the
CNC side may be damaged.
Contact our system department.
4080 Incorrect data.
When the "Write to PLC" is
executed:
Two or more END
commands are included in
the specified ladder file.
Edit the ladder program in the
list mode to delete END
commands except only one at
the last line.
8201 Cannot communicate with the
PLC.
The communication cable is
faulty.
• Not connected
• DTR signal off
Check the serial port setting
and cable connection.
840b Cannot communicate with PLC
for one of the following
reasons.
There is no response from the
NC.
• The CNC has not started
properly.
• The connection channel of
the CNC side serial port is
different.
• The serial cable outside the
specifications is used for
signal connection.
Check the following.
• CNC side status
• Cable connection
• Bit selection
: GPP communication valid
: GPPW mode
(Note) For "PLC" in the message, read "CNC".