Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual - Manual (Page 79)

Chapter
6
6Ć1
Message Procedure Commands
The 1775–KA module has its own command language that you can use in
programming message procedures. This chapter describes the available
commands and gives some examples on how to use them. Table 6.A
summarizes the commands.
Table 6.A
Message Procedure Commands
Command Format and Explanation
=
(assignment)
<destination>3=<source>
Assign a numeric value to a user symbol or copy data from
the source to the destination
CREATE C@<system symbol><logical address>
Create a symbolic address and equate it to a logical address.
DELETE D @<system symbol>
Delete a symbolic address or an entire message procedure
from PLC-3 memory.
(execute) @<system symbol>
Execute the named message procedure.
EXIT E
Terminate execution of the current message procedure.
GOTO G <label>
Continue executing the current procedure from the point
specified by the label.
IF I <expression><embedded command>
Execute the embedded command only if the specified
expression is true.
ON_ERROR O <embedded command>3
Execute the embedded command only if an error occurs after
this statement in the procedure.
STOP S
Terminate execution of the message (MSG) instruction in the
PLC-3 ladder diagram program.
Each command can be abbreviated to the letters shown in the format
column of Table 6.A. In general, it is best to abbreviate a command to the
shortest possible form. This not only makes the commands easier to
program, but it also saves memory space and reduces execution time.
General