What's 1734-ARM used for?

[Mray]

Hi,


Could you please explain me what 1734-ARM (ADDRESS RESERVE MODULE) is used for exactly?
I have read the Rockwell Manual but did not get my answer.

 

[plvlce]

It serves as a placeholder, allowing you to 'reserve' a node address for a module you don't currently have on hand.

 

[Mray]

It serves as a placeholder, allowing you to 'reserve' a node address for a module you don't currently have on hand.

I got it. Thanks

 

[kamenges]

Module "slot" locations in a Point I/O group are assigned in the order they are encountered from left to right. You may have a control system design that supports an option that is not always needed. This means there may be I/O modules that aren't needed and that could be left out of the system. But if you just remove them then the adapter will re-address the modules right of the opening. Enter the 1734-ARM. It is a module that simply holds a slot address for something else. The 1734-ARM and cheaper than any actual module, especially intelligent modules like analog and safety modules. So there is come cost savings to be had by using them.

Keith

 

[Mray]

Module "slot" locations in a Point I/O group are assigned in the order they are encountered from left to right. You may have a control system design that supports an option that is not always needed. This means there may be I/O modules that aren't needed and that could be left out of the system. But if you just remove them then the adapter will re-address the modules right of the opening. Enter the 1734-ARM. It is a module that simply holds a slot address for something else. The 1734-ARM and cheaper than any actual module, especially intelligent modules like analog and safety modules. So there is come cost savings to be had by using them.

Keith

yeah I pretty got the point but I don't understand why we can't remove the module which is no longer needed though we can add it whenever we need it at the end of the queue?

 

[jstolaruk]

yeah I pretty got the point but I don't understand why we can't remove the module which is no longer needed though we can add it whenever we need it at the end of the queue?

The more popular thing to do is leave the original definition in and inhibit the module. If you physically remove it, then just change the subsequent definition module number.

 

[plvlce]

If you physically remove the module, all modules past it will be detected as 1 node lower, so you have to do some extra work in your program. The 1734-ARM allows you to remove the unused module by replacing it with a cheaper module. You would also need to inhibit the module as already noted.

 

[Mray]

If you physically remove the module, all modules past it will be detected as 1 node lower, so you have to do some extra work in your program. The 1734-ARM allows you to remove the unused module by replacing it with a cheaper module. You would also need to inhibit the module as already noted.

Appreciate you all.