Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manuale Utente Scaricare il pdf (Pagina 78)

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Chapter 5

54

Note that it is not always necessary to create a message procedure. If you

want to execute just a single assignment command that is no more than 76

characters long, then you can enter that command as part of the ladder

diagram message instruction (Table 5.A). If you want to execute more

than one 1775–KA command, or if a single assignment command is more

than 76 characters long, then you must create a message procedure to

contain those commands.

Also note that every message procedure must end with either an EXIT or

a STOP command. The EXIT command is normally preferred because the

STOP command is a more extreme measure that results in error 179

(Appendix B).

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Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manuale Utente Pagina 78