If retain data is resident in non-volatile memory, the value specified in step 3 should
be restored. If retain data is resident in volatile memory, the value saved to the flash
memory in step 2 should be restored.
● Operation and Recovery after Power Off of External Field Power Supply
of FCN-500, FCN-RTU
When the external field power supply of FCN-500 or FCN-RTU is turned off, IOP
(input open alarm) or OOP (output open alarm) is reported in device label variables
of I/O modules requiring I/O field power.
If IOP is reported in an input device variable, this status is sent to applications.
If OOP is reported in an output device variable, this status is sent to applications.
By turning off and then turning on the external field power supply, compare the
actual operation of the control application against the IOP and OOP operation and
recovery stated in the requirement specification and ensure that requirements are
met.
Details on IOP and OOP, as well as the behavior of NPAS POUs under these alarm
conditions are described in the online help as shown below.
● Operation and Recovery after Communication Disconnection
With the FCN-500 or FCN-RTU running, disconnect the communication using any of
the following means and check the operation of the control application.
1. Switch off the connected equipment;
2. Pull out the communication cable;
3. Switch off hubs or other relay equipment, if any, on the communication path;
4. If an FCN communication module is used, unmount the communication
module; or
5. Any other means as required to disconnect communication.
After communication is temporarily disconnected, restore the original state by
reversing the above operation and check that communication is properly restored.
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