How to simplify code using arrays and indexing


Within this post, we demonstrate how to read or write an array of data or index the device register referenced within a GetData or SetData statement. Adhering to these guidelines will allow you to produce more efficient code that is easier to maintain.

Software Version:

EasyBuilder Pro


Note: This section is introduced under the assumption that you have already defined a GetData or SetData statement within a macro. To learn how to declare these functions, please review this post: Link.


  1. A simple macro, similar to what we’ve defined below is quite easy to write and maintain:
    Note: This macro retrieves device data from register 4x-1 and assigns it to a variable called “data”.

  2. A more complex macro or one that is longer in size can be quite hard to maintain and can easily lead to erroneous output:
    Note: This macro retrieves device data from register 4x-1 ~ 4x-30 and assigns it to data[0] ~ data[29]. There are a few errors below, can you spot them?

  3. When statements reference addresses that are not consecutive in nature, addressing in this form becomes even more complex:


  1. We can rewrite the macro within example 2 more efficiently by redefining what is referred to as the “data count”:
    Note: This will retrieve and transfer an array of data from 4x-1 ~ 4x-30 using a single line statement. the “data count” is defined as 30 which matches the array length.

  2. In some cases, you can rewrite the macro within example 3 more efficiently using a “For” loop with a counter variable ‘i’ to index the register number and array index:
    Note: The section “4x, 13 + (i * 13)” will jog the device address from 4x-13 to 4x-169 as ‘i’ increases. Similarly, the array index changes according to ‘i’.


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