Справочник Пользователя для Mitsubishi Electronics 13JW55

 

 

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9.5  Spare Product 

Alternative products are easily purchased through Mitsubishi service centers or local 

Mitsubishi representatives in Japan. Thus the alternative products can be prepared 

even after an accident. However, note that for foreign-related products such as 

exported products, alternative products must be sent beforehand. 

Considering the following tips at design work makes the maintenance easier. 

 

(1)  Easily replaceable type 

Replacing building block-type modules is easy. Only replacing the faulty module 

is required. 

 

(2) Memory 

type 

To use standard RAMs or SRAM memory cards, backup batteries are required. 

The standard ROMs, Flash cards, and ATA cards do not require the battery for 

use, besides, these memories prevent unintentional program changes due to 

human-related mistakes. These memories are recommended to be employed in 

products for export. 

 

(3)  Reducing the number of module types 

Reducing the number of module types is efficient for reducing the number of 

spare product types. 

 

(4)  Reserving I/O points 

By not using all the I/O points on 16-, 32-, and 64-point I/O modules but 

reserving 10% to 20% of them, it is possible to just make changes on wiring and 

programs (I/O signals) instead of replacing the faulty module with a spare 

module when there are no spare modules. 

 

(5)  Creating a document 

Since sequence programs are easily modified, the inconsistency between an 

operating program and documents may occur (i.e. ladder diagram, program list). 

Keep updating the document. 

To do this, using a printer is efficient. 

 

(6)  Mastering peripheral device 

Mastering peripheral device such as a personal computer, GX Works2 helps 

the quick recovery from an accident.