4.3.1 Global labels ................................................................................................................................ 4 - 15

4.3.2 Local labels.................................................................................................................................. 4 - 15

4.3.3 Label classes ............................................................................................................................... 4 - 16

4.3.4 Setting labels ............................................................................................................................... 4 - 17

4.3.5 Data types.................................................................................................................................... 4 - 18

4.3.6 Expressing methods of constants................................................................................................ 4 - 20

4.4 Method for Specifying Data

4.4.1 Bit data......................................................................................................................................... 4 - 22

4.4.2 Word (16 bits) data ...................................................................................................................... 4 - 23

4.4.3 Double word (32 bits) data........................................................................................................... 4 - 25

4.4.4 Single-precision real/double-precision real data.......................................................................... 4 - 27

4.4.5 String data ................................................................................................................................... 4 - 30

4.4.6 Time data..................................................................................................................................... 4 - 31

4.4.7 Arrays ......................................................................................................................................... 4 - 32

4.4.8 Structures .................................................................................................................................... 4 - 34

4.5 Device and Address

4.5.1 Device ......................................................................................................................................... 4 - 35

4.5.2 Address........................................................................................................................................ 4 - 36

4.5.3 Correspondence between devices and addresses...................................................................... 4 - 37

4.6 Index Setting

4.7 Libraries

4.7.1 User libraries................................................................................................................................ 4 - 53

4.8 Precautions on Assigning a Name

5. WRITING PROGRAMS

5.1 ST Language

5.1.1 Standard format ............................................................................................................................. 5 - 2

5.1.2 Operators in ST language.............................................................................................................. 5 - 3

5.1.3 Syntaxes in ST language............................................................................................................... 5 - 4

5.1.4 Calling functions in ST language ................................................................................................... 5 - 9

5.1.5 Calling function blocks in ST language........................................................................................ 5 - 10

5.2 Structured Ladder Language

5.2.1 Standard format ........................................................................................................................... 5 - 11

5.2.2 Ladder symbols in structured ladder language............................................................................ 5 - 12

APPENDIX

Appendix 1 Correspondence between Generic Data Types and Devices

Appendix 2 Character Strings that cannot be Used in Label Names and Data Names

Appendix 3 Recreating Ladder Programs

Appendix 3.1 Procedure for creating a structured program ................................................................ App - 8

Appendix 3.2 Example of creating a structured program .................................................................... App - 9

INDEX

4 - 15

4 - 21

4 - 35

4 - 40