Equipments (Devices) > PLC200 > Program > String > STR

Block that performs concatenation of STR1 and STR2, storing the result in DST.

Ladder Representation

STR_CONCAT_block

Block Structure

Variable Type	Name	Data Type	Description
VAR_INPUT	EN	BOOL	Block enabling
	STR1	STRING	First STRING
	STR2	STRING	Second STRING
VAR_OUTPUT	DONE	BOOL	Output enabling
VAR_OUTPUT	DST	BYTE	Variable that receives the new STRING formed from the junction of STR1 and STR2

Operation

This block remains active as long as EN is at TRUE level, updating the value of DST according to the input STRINGs. DST receives STR1 value concatenated with STR2 value at its end.

The DONE value forwards to the next Ladder block the EN value when the operation is completed.

NOTE!

If the size of DST is less than the sum of the number of characters STR1 and STR2, the resulting value will be truncated.

Compatibility

Device	Version
PLC300	2.10 or higher

Block Flowchart

STR_CONCAT_flowchart

Example in Ladder

STR_CONCAT_example01

In the above example, STR1 and STR2 are concatenated, and the result is sent to DST_10. When the block is ended successfully, the DONE output is activated.

STR_CONCAT_example02

In the above example, STR1 and STR2 are concatenated, and the result is sent to DST_6. Since the size of DST_6 is 6, the last two characters of the concatenation are discarded. The block ends successfully, Done output is activated.

Example in ST

The example below displays the instructions for applying the example above in the ST language.

VAR

STR1 : STRING := 'abcd';

STR2 : STRING := '1234';

DST_6 : STRING;

END_VAR

DST_6 := FB_STR_CONCAT(

EN:=DI1,

STR1:=STR1,

STR2:=STR2,

Done=>DO1);