FUNCTION_BLOCK ML

As illustrated above, this Basic Function Block type provides examples of multi-line comments on:

Event and Data I/O
ECC elements
An ST Algorithm

The text fragments below illustrate the use of multi-line comments in the IEC 61131-3 Structured Text (ST) language, and their translation into the Java® language for the Function Block Runtime (FBRT) platform.

ALGORITHM REQ IN ST : (* Normally executed algorithm
       A multi-line comment
       on an Algorithm *)
//Test 1
(* Test 2 *)
/* Test 3
*/
(* Test 4 *) 
/* Test 5 */ 
QO := QI; //Test 6
// Test 7
(* Test 8 *)
/* Test 9 */
//This used to cause a bug in Java code
END_ALGORITHM

Java

  /** ALGORITHM REQ IN ST
 * Normally executed algorithm
 *   A multi-line comment
 *   on an Algorithm
 */
public void alg_REQ(){
//Test 1
/* Test 2 */
/* Test 3
*/
/* Test 4 */ 
/* Test 5 */ 
QO.value = QI.value; //Test 6
// Test 7
/* Test 8 */
/* Test 9 */
//This used to cause a bug in Java code
}