<2. Basic Design and Function Design>
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1. In the case of 1.2 described above, the following dialog is displayed before offline download:
This message indicates that warm start using retain data residing in the memory will not be
possible after downloading. It does not mean that warm start, in itself, is not allowed.
2. In this case, performing a warm start after completion of offline download generates the following
PLC error:
The first line of the message means that cold start was performed as warm start using retain
data in memory was not possible. The second line of the message means that the FCN-500 or
FCN-RTU was restarted using retain data saved on the flash memory.
From these two error messages, retain data saved on the flash memory was restored by a warm
start after an offline download is understood.
2. If FCN/FCJ is cold started
After a cold start, the FCN-500 or FCN-RTU initializes all variables and start
controlling. In other words, all retentive variables are initialized by a cold start.
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The retain data structure will be changed by the following events:
- Adding or deleting an NPAS POU having one or more access parameters or engineering
parameters specified as retain data
- Specifying a non-retentive variable as a retentive variable or vice versa
- Changing the data type of a variable specified as retain data
The behavior of retain data on the FCN-500 or FCN-RTU start mode described above applies
similarly when the FCN-500 or FCN-RTU is stopped from Logic Designer’s Application Control
dialog,and then restarted without performing downloading.
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