Omron WS02-CXPC1-V8 - V8.1 REV 02-2009 Operation Manual page 14

Application Precautions
Observe the following precautions when using the CX-Programmer's SFC functions.
• As a rule, the outputs of actions are reset when a step is changed from active status to
inactive status. When changing an output's hold/reset setting, change the initial
setting or add reset processing as necessary. When making changes, verify the
operational timing of actions in the preceding and following steps.
Note: Refer to 1-5-1 Holding or Resetting an Action's Outputs and 1-5-2 Action Program
• Observe the following precautions before starting the CX-Programmer.
• Do not turn OFF the power supply to the PLC or disconnect the connecting cable
while the CX-Programmer is online with the PLC. The computer may malfunction.
• Confirm that no adverse effects will occur in the system before attempting any of the
following. Not doing so may result in an unexpected operation.
• Check the user program for proper execution before actually running it on the Unit.
Not checking the program may result in an unexpected operation.
• When online editing is performed, the user program and parameter area data in CJ2,
CS1-H, CJ1-H, CJ1M, and CP1H CPU Units is backed up in the built-in flash memory.
The BKUP indicator will light on the front of the CPU Unit when the backup operation
is in progress. Do not turn OFF the power supply to the CPU Unit when the BKUP
indicator is lit. The data will not be backed up if power is turned OFF. To display the
status of writing to flash memory on the CX-Programmer, select Display dialog to
show PLC Memory Backup Status in the PLC properties and then select Windows –
PLC Memory Backup Status from the View Menu.
xiv
Precautions for details.
• Exit all applications not directly related to the CX-Programmer. Particularly exit
any software such as screen savers, virus checkers, E-mail or other
communications software, and schedulers or other applications that start up
periodically or automatically.
• Disable sharing hard disks, printers, or other devices with other computers on any
network.
• With some notebook computers, the RS-232C port is allocated to a modem or an
infrared line by default. Following the instructions in documentation for your
computer and enable using the RS-232C port as a normal serial port.
• With some notebook computers, the default settings for saving energy do not
supply the rated power to the RS-232C port. There may be both Windows settings
for saving energy, as well as setting for specific computer utilities and the BIOS.
Following the instructions in documentation for your computer, disable all energy
saving settings.
• Changing the operating mode of the PLC.
• Force-setting/force-resetting any bit in memory.
• Changing the present value of any word or any set value in memory.