Introduction to Programming
Chapter 4
422
unlatch instructions are cleared to zero. All other word and bit addresses
are not cleared when a rung is removed.
Changing Data of a Word or Block Instruction
The data of any word or block instruction, except the Arithmetic and Put
instructions, can be changed in the program mode without removing and
re-entering the instruction. This is done by positioning the cursor on the
appropriate word instruction and pressing [INSERT][Data Digits]. When
the last digit of the data is entered, the function is terminated and the data
is entered into memory. Once the first digit has been entered, the [
→
] [
←
]
keys can be used. The function can also be terminated and entered
into memory before the last digit is entered by pressing [CANCEL
COMMAND].
Changing the Address of a Word or Block Instruction
The address of a word or block instruction with data, excluding Arithmetic
and Put instructions, can be changed without removing and re-entering
the instruction. To do this, position the cursor on the instruction and press
[INSERT]. The cursor, although not displayed, will position itself on the
first data digit. Enter that digit to display the cursor. Then, cursor back to
the address digits using the [
←
] key and change the address as needed. Use
a leading zero if required.
Changing an Instruction or Changing the Address of an Instruction
Without Data
To replace an instruction with another, place the cursor on the instruction.
Then press the instruction key or key sequence of the desired instruction
and the required address(es). This procedure also can be used when
changing the address of an instruction that does not contain data.
Online Data Change
Certain data of a word or block instruction, excluding Arithmetic and Put
instructions, can be changed while the processor is in the run/program
mode. This is done by positioning the cursor on the appropriate instruction
and pressing [SEARCH] 51. The key sequence will display the message
ON-LINE DATA CHANGE, ENTER DIGITS FOR: <Required
information> near the bottom of the screen. The new digits will be
displayed in a command buffer as they are entered. After the new data is
displayed, press [INSERT] to enter the data into memory.
To terminate this function, press [CANCEL COMMAND].
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