User`s manual

122
(c) When the number of times remote password mismatch occurs is large
• When the number of times notification of a remote password mismatch is received exceeds the number of
times specified in buffer memory address 8204 (200CH), the Q Series C24 disconnects the line
automatically. (The connection signal (X12) turns OFF.) After confirming the remote password registered in
the QCPU and the remote password specified in the external device execute line connection again.
• When the number of times notification of a remote password mismatch is received exceeds the accumulated
count value (buffer memory address 8205 (200DH)), the Q Series C24 executes the following processing.
(The line and modem are not disconnected.)
(when communicating using MC protocol)
• An error code (7FE8H) is stored in the buffer memory's MC protocol transmission error code storage area
(address 602/618 (25AH/26AH).
• The CHn side error occurrence signal (XE/XF) turns ON and the ERR LED lights up.
(When communicating using GX Developer)
• An error code (7FE8H) is stored in the buffer memory's modem function error code storage area (address
545 (221H).
• The CHn side error occurrence signal (XE/XF) turns ON and the ERR LED lights up.
• The accumulated number of times up to the present a remote password mismatch occurred (accumulated
count value in the Q series C24) can be checked in the area where the accumulated count of unlock process
abnormal completion is stored (address 8956 (22FCH)).
• The user should clear the accumulated number of times up to the present a remote password mismatch
occurred using one of the following methods.
• Set the accumulated count of unlock processing abnormal completion to "0" on the GX Configurator-SC's
modem function monitor/test screen.
• Write "0" in the buffer memory area where the accumulated count of unlock process abnormal completion
is stored (address 8956 (22FCH)).
If the CHn side ERR occurrence signal (XE/XF) for the Q series C24 turns ON and the ERR LED lights up, this could indicate
improper access from the external device.
See also an example of measures taken on the programmable controller CPU side described in Page 124, Section 3.3.7
(12).
Remark
Refer to the User's Manual (Basic) for the method for turning off the Q Series C24's ERR LED when it lights up.