Introduction to Programming
Chapter 4
415
The ladder diagram instructions are entered with the processor in the
program mode. When entered, they are displayed as intensified and
blinking to indicate cursor position and that information is needed.
When entering addresses and data, the reverse-video character cursor can
be manipulated to the left and right using the [←] and [→] keys to make
corrections. It can also be moved to any accessible position within an
instruction block using the same keys. The character cursor cannot be
moved to the left past the first digit. If the character cursor is moved off the
instruction address to the right, the instruction will be entered. It will stop
blinking but will remain intensified until the next instruction is pressed or
the instruction cursor is moved.
Bit addresses with 6 or 7 digits can be entered provided the [EXPAND
ADDR] key is pressed. If a 5-digit bit address is displayed and a larger bit
address is required, the [EXPAND ADDR] key can be pressed at any time
provided the last digit has not been entered. If the last digit was entered,
the instruction must be removed and the entire address must be re-entered.
Word addresses, unlike bit addresses, do not require the [EXPAND ADDR]
key. Instead, always use leading zeros when necessary.
Any time a digit being entered is not within the proper limits, the message
DIGIT OUT OF RANGE will be displayed. The cursor will remain in the
same position until a valid digit is entered.
Help directories have been developed as an aid in using the industrial
terminal (Table 4.B). They list the several functions or instructions
common to a single multi-purpose key such as the [SEARCH] or [FILE]
key. A master help directory is also available which lists the eight function
and instruction directories for the PLC-2/30 and the key sequence to access
them. The master help directory is displayed by pressing the [HELP] key.
The [HELP] key can be pressed any time during a multi-key sequence.
The remaining keys in the sequence can then be pressed without pressing
[CANCEL COMMAND].
4.4.1
Addressing
4.4.2
Help
Directories
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
To Next Page
Loading...
Need help?
General
