Siemens SIMATIC S7 System Manual page 198

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100BBasic instructions

The enable output ENO = 0, if one of the following conditions applies:

● The EN input has signal state "0"

● The array element specified at the INDEX parameter is not defined in the array

● Errors such as an overflow occur during processing

Accessing data by array indexing

To access elements of an array with a variable, simply use the variable as an array index in

your program logic. For example, the network below sets an output based on the Boolean

value of an array of Booleans in "Data_block_1" referenced by the PLC tag "Index".

The logic with the variable array index is equivalent to the former method using the

FieldRead instruction:

FieldWrite and FieldRead instructions can be replaced with variable array indexing logic.

SCL has no FieldRead or FieldWrite instructions, but supports indirect addressing of an

array with a variable:

#Tag_1 := "Data_block_1".Bool_Array[#Index];

referenced at MEMBER parameter

S7-1200 Programmable controller

System Manual, 11/2011, A5E02486680-05

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Simatic s7-1200