Creating Step Ladder Program Instructions; Ladder Diagrams - Omron WS02-LCTC1-EV5 - V5.2 REV 12-2008 Manual

Creating Step Ladder Program Instructions

3-7

Creating Step Ladder Program Instructions

3-7-1 Ladder Diagrams

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This section provides information on the creating a step ladder program (block
model 301). Either a ladder diagram or mnemonics can be selected to create the
step ladder program.
If the CX-Process Tool's version is 2.50 (or higher) and ITEM200 (the Mnemonic
Flag) is set to 0, the program will be assembled automatically (ladder diagram to
mnemonic conversion) when it is downloaded and disassembled automatically
(mnemonic to ladder diagram conversion) when it is uploaded.
If ITEM200 (the Mnemonic Flag) of a step ladder program (block model 301) is
set to 1, the program will not be assembled and disassembled automatically and
it cannot be assembled and disassembled manually. In this case, the created
step ladder program cannot be downloaded to the Loop Controller, although
mnemonic programs can be download and uploaded.
Take the following steps to create a step ladder program in a ladder diagram.
Note 1. When creating a ladder diagram, ITEM200 (the Mnemonic Flag) of the step
ladder program (block model 301) must be set to 0.
• If ITEM200 (the Mnemonic Flag) is set to 0, the CX-Process Tool (Version
2.50 or higher) will automatically assemble the program (convert ladder
diagram to mnemonic) when it is downloaded and disassemble the pro-
gram (convert mnemonic to ladder diagram) when it is uploaded. It will
also be possible to manually assemble/disassemble the program.
• If ITEM200 (the Mnemonic Flag) is set to 1, the program will not be as-
sembled and disassembled automatically and it cannot be assembled and
disassembled manually. In this case, the created step ladder program
cannot be downloaded to the Loop Controller, although mnemonic pro-
grams can be download and uploaded.
2. When ITEM200 (the Mnemonic Flag) is set to 0, always convert the mne-
monic code before downloading the step ladder program block created in
the ladder diagram to the Loop Controller. If the mnemonic code is not con-
verted, the mnemonic code (STEP00 only when the default is used) that
was created with the previous assemble operation will be downloaded.
3. Confirm that equipment will not be adversely affected before changing timer
command settings. Machines and devices may perform unexpected opera-
tion if settings are transferred incorrectly.
4. Each program block in a ladder diagram can have up to 22 lines and 10 col-
umns.
Always set ITEM200 (the Mnemonic Flag) of a step ladder program (block model
301) to 0 in advance. When the Mnemonic Flag is set to 0, the program will be
converted to mnemonic code automatically (assembled) when it is downloaded
to the Loop Controller. (This function is supported by Loop Control Unit Version
2.50 and later versions, or LCBjjs.)
1. Click the 07. Sequence Control Folder and select Insert/Insert Function
Block from the Settings Menu so that the Step Ladder Program Block will be
allocated to a block address.
2. Select the Step Ladder Block, and select Edit/Step Ladder Program from
the Settings Menu.
Section 3-7