Omron CX-Programmer 9, Operation Manual

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PART 1: CX-Programmer
CHAPTER 4 – Reference OMRON
CX-Programmer _Page 94
2. Enter an instruction, either by name or by number. When a correct number has been
entered (of the correct number of digits for the PLC type), the instruction name is
automatically substituted. To insert an instruction with Immediate Refresh properties,
apply an exclamation mark (‘!’) to the beginning of the instruction. To insert a
differentiated instruction, apply a ‘@’ symbol to differentiate up or a ‘%’ symbol to
differentiate down at the beginning of the instruction.
Alternatively, click the Find Instruction pushbutton. The Find Instruction dialog is
displayed providing a list of possible instructions. Those instructions not available for the
selected PLC are displayed in brackets. Select an Instruction by using the
Groups and
Instruction fields and select the OK pushbutton to return to the Edit Instruction dialog.
The Availability pushbutton on the Find Instruction dialog displays the PLC Instruction
Support dialog that lists all PLCs for which the selected instruction in the Find Instruction
dialog is available. Select the Close pushbutton to remove the PLC Instruction Support
dialog.
The Expansion Table pushbutton on the Edit Instruction dialog displays the Expansion
Instruction Mapping dialog and is only available to certain PLCs. This dialog allows
certain instructions to be assigned to an expansion slot.
Select an Expansion Slot , select an Instruction and select the Set pushbutton. To remove
an instruction, select the Expansion Slot and select the Remove pushbutton. Alternatively,
select the Set Defaults pushbutton to apply default instruction assignments. Select the
OK pushbutton to return to the Edit Instruction dialog.
3. If required, use the Instruction Help button, which shows a help topic for the chosen
instruction.
4. Enter the instruction operands (see below).
5. Select the OK pushbutton from the Edit Instruction dialog to complete the operation.
Select the Cancel pushbutton to abort the operation.
Modifiers can be set for contact instructions (LD, AND, OR and NOT) – either differentiate up or differentiate
down. Contact and coil instructions OUT and OUT NOT can be set to immediate update. The availability of
modifiers depends upon the type of PLC being used.
Non-differentiated instructions execute each time they are scanned, but differentiated instructions execute only
once after their execution condition switches from OFF to ON or from ON to OFF.
Entering Operands
An instruction operand can either be entered as a symbol, address or literal value. When entering an operand in
the detailed dialog mode, the dialog shows the valid address ranges and types of operands that are allowed.
When entering an operand, a prefix character may be used to add a meaning:
* An indirect address (the contents of the given address are used as the address to find the data).
Can be used in front of a symbol name.
# A hexadecimal value. Also used for operands that must take a BCD number.
& A decimal or BCD-format number.
+ or - A signed, decimal, floating point value.
Note that a symbol can hold a value – the NUMBER data type is used.
It is possible to search for a symbol from the operand box by pressing the ‘…’ button to its right (or by pressing
F2). This presents a dialog that allows a symbol to be selected or created.
Symbol Information
Whenever CX-Programmer finds a symbol associated with the typed operand, (except number types) symbol
information is displayed in this box. The name, address/value and comment are shown, together with the data
type of the symbol and its scope, global or local.
Specifying Address Offsets
When using a CJ2 CPU Unit, offsets can be set for addresses when specifying operand addresses for input
conditions, output instructions, or special instructions in ladder diagrams. The offset is placed into brackets [ ]