EEPROM and PLC ranges

[tested]

Can someone help me with the following questions:

1. What is the use of an EEPROM in a PLC?

2. Why do PLC's have IO ranges such as 2048 and not 2000?

Thanks
Tested

 

[Steve Bailey]

Give us your answers and your reasoning that leads to them and somone will comment.

 

[OZEE]

Haven't you been paying attention in class or reading the textbook??

 

[rdrast]

EEPROM's have absolutely no reason to be in a PLC. The only real way of having secure memory is to actually burn a ROM. EEPROM's are much too affected by cosmic rays.

2048 is SOooooooo much better then 2000, no? It's just marketing. Old, boring PLC's used to have only 2000 available I/O, then some marketing genius figured out that if they added a couple more transistors, they could sell a 2048 I/O model. It's kind of the reverse of "19.99" is psychologically much cheaper then "20.00".

 

[milldrone]

2. Why do PLC's have IO ranges such as 2048 and not 2000?

There are 10 kinds of people in this world, those that understand binary and those that don't!