7 ONLINE MODULE CHANGE

MELSEC-Q

7 ONLINE MODULE CHANGE

This chapter describes the specifications of an online module change.

(1)Perform an online module change by operating GX Developer.

(2)To ensure ease of offset/gain re-setting, there is a user range save/restoration function that is performed by executing the dedicated instruction or read/write from/to buffer memory.

POINT

Perform an online module change after making sure that the system outside the PLC will not malfunction.

To prevent an electric shock or like, always switch OFF the external power of the module that will be changed online.

After the module has failed, data may not be saved properly. Referring to Section 3.4.15, therefore, prerecord the data to be saved (offset/gain values of the industrial shipment settings and user range settings in the buffer memory).

(Note)

The dedicated instruction cannot be executed during an online module change. When using the dedicated instruction to execute save/restoration, therefore, execute save/restoration in the other system.

If the other system is unavailable, execute restoration by performing write to the buffer memory.

7.1 Online Module Change Conditions

The CPU, A/D converter module, GX Developer and base unit given below are needed

 

 

to perform an online module change.

7

(1)

CPU

 

 

The Q12PHCPU or Q25PHCPU is needed. Note that it cannot be used on the

 

 

 

 

remote I/O station of the MELSECNET/H.

 

 

For precautions for multiple PLC system configuration, refer to the Process CPU

 

 

User's Manual (Function Explanation/Program Fundamentals).

 

(2)

A/D converter module

 

 

The module of function version C or later is necessary.

 

(3)

GX Developer

 

 

GX Developer of Version 7.10L or later is necessary.

 

(4)

Base unit

 

 

1) For an online module change, use the main base unit and Q6 B extension

 

 

base unit.

 

 

The module installed on the main base unit or Q6 B extension base unit can

 

 

be change online.

 

 

2) The module installed on the Q5 B extension base unit cannot be changed

 

 

online.

 

 

When the Q5 B is in use, the module installed on the main base unit cannot

 

 

be changed online, either.

 

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Mitsubishi Electronics Q68ADI, Q68ADV, Q64AD Online Module Change Conditions, Converter module, GX Developer, Base unit

Q68ADV, Q68ADI, Q64AD specifications

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