Mitsubishi Electric MELSEC-A Series User Manual page 90

7
TROUBLESHOOTING
Symptom
Unable to operate programmable
controller CPU from the engineering
tool.
When using AJ61BT11 or
A1SJ61BT11, access to
programmable controller from GX
Developer connected to AJ65BT-R2N
generates communication error.
An external device detects a
communication error at powering on
the AJ65BT-R2N.
7
- 3 7.1 Troubleshooting When Using the MELSOFT Connection Function
Table 7.1Troubleshooting list (Continued)
Cause
Unable to access from the engineering tool to
the programmable controller CPU.
Some settings in the engineering tool are not
correct.
The programmable controller CPU has
frequently executed FROM/TO instructions to
the buffer memory of the AJ61BT11 or
A1SJ61BT11.
RS-232 communications of the AJ65BT-R2N
may be unstable immediately after powering
on the AJ65BT-R2N.
(From previous page)
Action
•When an error message, "Cannot communicate
with the PLC." is displayed in the engineering
tool, check the following.
•Check if the specified target station No. is
correct.
•Check the RS-232 cable connected
between the AJ65BT-R2N and GX
Developer for any fault.
•When the AJ61BT11 or A1SJ61BT11 is used,
confirm the restrictions on the use of the
MELSOFT connection mode.
Section 4.2 (3) Precautions for use of the
MELSOFT connection function
•When the access target is AJ61BT11 or
A1SJ61BT11, check if the condition setting
switch, SW8 is set to OFF (Intelli. mode).
•If an error message meaning the following is
displayed in the engineering tool, check the
station No. setting for the access target.
•Password has not been changed.
•Unable to receive data from the
programmable controller. (Timeout)
•The programmable controller type is
different.
•When an online operation is not possible in the
correct setting, or when an error message other
than the above is displayed, refer to the following
manual and take corrective actions.
Operating manual for the engineering tool
used
•In the case of access to the buffer memory of the
AJ61BT11 or A1SJ61BT11, add a contact to the
FROM/TO instruction so that the input signal
(XnC) to the module is OFF.
•Power on the order of the AJ65BT-R2N and
external device.