Application Precautions - Omron WS02-LCTC1-EV5 - V5.2 REV 12-2008 Manual

Application Precautions

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4 Application Precautions
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Before forcing changes of analog signals or contact signals using Validate Ac-
tion, confirm the safety of the instrumentation system as a whole. Not doing so
may result in unexpected operation.
When downloading a sequence table for the LCBjj (unit ver. 1.5 or later) that
has been edited online with the CX-Process Tool version 3.2 or higher, confirm
that the system will operate normally with the edited sequence. If the sequence
is not suitable for operation, unexpected operation may result.
Confirm in advance the conditions at any node for which the sequence table is
being edited over a Controller Link or Ethernet network. Not doing so may result
in unexpected operation.
Confirm the status of connected devices before transferring the setting for the
MV tight shut function and MV analog output reverse function to the Loop Con-
troller. Devices and equipment may perform unexpected operations if the data
destination is mistaken.
When the calibration function is executed, the MV (manipulated variable) will
change due to changes in the PVs (present values) input to the control block.
Therefore, set pseudo-input values to confirm safety when the MW changes be-
fore executing the calibration function. Devices may perform unexpected opera-
tions, resulting in serious accidents.
Observe the following precautions when using CX-Process Tool and Loop Con-
troller.
If the power supply is turned OFF while function block data is being backed up
from RAM to flash memory, the backup will not be completed normally. If the
power supply is turned back ON within 24 hours, however, the super capacitor
will have held the RAM data. The backup operation will restart when power is
turned ON and operation will start when the backup has been completed. If the
power supply is turned OFF for more than 24 hours, however, RAM data will be
lost and operation will be started with the data that was previously saved to flash
memory. If this happens, the Cold Start Auto-execution Flag (A35807) will turn
ON to show that the previous data has been used. Use this bit in programming to
take whatever steps are necessary, such as downloading the most recent func-
tion block data. (For LCBjj only)
Loop Control Unit data is monitored and operated using CX-Process Monitor or
CX-Process Monitor Plus based on the monitor tag files created using CX-Pro-
cess Tool. When creating monitor tag files using CX-Process Tool, CX-Process
Monitor must be installed on the same computer.
Before using function block data in actual operation, confirm operation by moni-
toring run status (to check the load rate; select Execute/Operation/Monitor
Run Status) and validating actions (select Validate Action/Start) with CX-Pro-
cess Tool. In particular, be sure to confirm that the load rate will be less than 60%.
(For details on the load rate, refer to the Operation Manual for the Loop Control-
ler.)
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