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136 • Chapter 7 Application Programming DMC-1700/1800
While in the Edit Mode, the programmer has access to special instructions for saving, inserting and deleting program
lines. These special instructions are listed below:
Edit Mode Commands
<RETURN>
Typing the return key causes the current line of entered instructions to be saved. The editor will automatically
advance to the next line. Thus, hitting a series of <RETURN> will cause the editor to advance a series of lines.
Note, changes on a program line will not be saved unless a <return> is given.
<cntrl>P
The <cntrl>P command moves the editor to the previous line.
<cntrl>I
The <cntrl>I command inserts a line above the current line. For example, if the editor is at line number 2 and
<cntrl>I is applied, a new line will be inserted between lines 1 and 2. This new line will be labeled line 2. The
old line number 2 is renumbered as line 3.
<cntrl>D
The <cntrl>D command deletes the line currently being edited. For example, if the editor is at line number 2 and
<cntrl>D is applied, line 2 will be deleted. The previous line number 3 is now renumbered as line number 2.
<cntrl>Q
The <cntrl>Q quits the editor mode. In response, the DMC-1700/1800 will return a colon.
After the Edit session is over, the user may list the entered program using the LS command. If no operand follows
the LS command, the entire program will be listed. The user can start listing at a specific line or label using the
operand n. A command and new line number or label following the start listing operand specifies the location
at which listing is to stop.
Example:
Instruction Interpretation
:LS List entire program
:LS 5 Begin listing at line 5
:LS 5,9 List lines 5 thru 9
:LS #A,9 List line label #A thru line 9
:LS #A, #A +5 List line label #A and additional 5 lines
Program Format
A DMC-1700 or DMC-1800 program consists of DMC instructions combined to solve a machine control
application. Action instructions, such as starting and stopping motion, are combined with Program Flow
instructions to form the complete program. Program Flow instructions evaluate real-time conditions, such as
elapsed time or motion complete, and alter program flow accordingly.
Each DMC-1700/1800 instruction in a program must be separated by a delimiter. Valid delimiters are the semicolon
(;) or carriage return. The semicolon is used to separate multiple instructions on a single program line where the
maximum number of instructions on a line is limited by 80 characters. A carriage return enters the final command
on a program line
.
Using Labels in Programs
All DMC-1700/1800 programs must begin with a label and end with an End (EN) statement. Labels start with the
pound (#) sign followed by a maximum of seven characters. The first character must be a letter; after that, numbers
are permitted. Spaces are not permitted.
The maximum number of labels which may be defined is 254.
Valid labels
#BEGIN