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(4) Precautions
(a) Password management
A password registered with a file cannot be read from the file.
Forgetting the registered password disables the following operations.
• Program memory or memory card: Format PLC memory
• Standard ROM: Batch-writing
Make sure to record the registered password and store the recording paper.
(b) Operations that overwrite a file independent of the password registration setting
The following operations overwrite a file in the target drive (program memory, standard ROM) independent of
the password registration setting.
• Boot from a memory card
• Replacement of the CPU modules with a memory card (backup data restoration function)
6.19.2 Remote password
(1) Definition
This function prevents unauthorized remote access to the CPU module.
If a remote password has been set and the CPU module is remotely accessed, entering a remote password is
required.
(2) Settable modules and the number of settable modules
Table6.32 shows the modules for which the remote password can be set and the number of settable modules.
Ethernet module
Serial communication module
Modem interface module
Built-in Ethernet port QCPU
●
The number of settable modules in the above table indicates the number of modules for which the remote password
can be set, not the number of mountable modules in the system using the CPU module.
●
For the number of mountable modules in the system, refer to the following.
QCPU Userís Manual (Hardware Design, Maintenance and Inspection)
●
For details of the remote password of each module, refer to the following.
Manual for each module
6 - 108
Table6.32 Settable modules and the number of settable modules
Settable module
Number of settable modules
4
8
1
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