5DATA COMMUNICATION USING THE MELSEC COMMUNICATION PROTOCOL
REMARK
The remote password should be set to a QCPU using GX Developer in order to use the remote password function of QCPU.
•Unlocking the remote password is possible only for the QCPU of the local station with the Q series C24.
It is impossible to unlock the remote password for the QCPU of other stations. See Section 3.18 of the Reference Manual for the command for unlocking the remote password.
•When accessing the PLC using GX Developer, the remote password should be unlocked when starting the online operation.
(3)Q series C24 setting and monitoring function when using the QCPU remote password function
(a)Modem function system setting by GX
1)Remote password mismatch notification count designation Designate the number of times before notification when a remote password disagreement occurs at the unlock processing by the user/external device after the line is connected.
The Q series C24 automatically disconnects the line if more remote password disagreements occur than the number of times designated by this value.
2)Remote password mismatch notification accumulated count designation Designate the number of times before notification when remote password disagreements occur at the unlock processing by the user/external device after the startup of the Q series C24.
The error signal on the CHn side (XE, XF) and the ERR LED turn on if remote password disagreements occur more than the number of times designated by this value (the line is not disconnected).
The user can clear the cumulative value counted by the Q series C24 at an occurrence of remote password disagreement using either one of the methods below:
•Set the cumulative number of abnormal completions of unlock processing to "0" in the modem function monitor/test screen of GX
•Write "0" to the storage area in the buffer memory corresponding to the Accumulated count of abnormal completions of unlock processing (address: 8956 (22FCH)).
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