Mitsubishi Electric MELSEC-L Series - The Protocol Setting Data Cannot be Read or Written

250
16.6.7 The protocol setting data cannot be read or written.
The following table lists how to troubleshoot the problem when the protocol setting data cannot be read or written.
Check that GX Works2 and the CPU module are connectable on the Transfer Setup of GX Works2 before
troubleshooting the problem.
(1) To read the protocol setting data
(2) To write the protocol setting data
When an error is detected in the edited protocol, check that the conditions for element placement are satisfied in the Packet
Setting.
Especially the following conditions must be satisfied.
• When a Non-conversion Variable (Variable length) or Non-verified Reception (Variable number of characters) is
placed behind a Length and is not included in the Length calculating range, place Static Data immediate after the
Non-conversion Variable or Non-verified Reception.
• When multiple Length elements are set in one packet, configure the setting so that each Length calculating range
does not overlap the others.
Check item Action
Are the values in Protocol setting data error information
(address: 5324
H
to 5327
H
) and Number of registered
protocols (address: 5328
H
) set to 0?
Write the protocol setting data to the E71 because they have not been
written.
Check item Action
Did the ERR.LED turn on after writing the protocol setting
data?
Check the values in Protocol setting data error information (address: 5324
H
to 5327
H
) and correct the error.