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4 USER GUIDE
Cable disconnection
Remote module stop
(STOP, power failure)
Local module error stop
If an FW or an extension area of expanded memory is set as the RAS bit area,
any data before resetting may remain there within two seconds after the resetting
condition has been cleared. Wait at least for two seconds after resetting, then
reference the defined area.
4.7 Hold Operation/Clear Operation
If data is not transmitted from a module that is in communication, this module is judged to have
stopped (power failure), a hold or clear (clear to 0) operation is performed for the area to save the
data from this module.
Hold operation
Data in the area (e.g., GW) where an inactive module is registered is held (retained) as is. The
last data transmitted remains.
Clear operation
The area (e.g., GW) in which an inactive module is registered is cleared to 0.
If the inactive module resumes communication, data update for the area in which the module is
registered is resumed in hold or clear operations. LQE010 and LQE015 are set to clear operation.
Table 4-3 Failures and RAS Table
Failure
The bits of all the modules before the place where the
associated ring was disconnected are cleared.
The bits of both the primary ring and secondary ring
of the associated module are cleared.
The bit of the local module is cleared. Since data
cannot be received from other modules, all the bits of
the primary ring and secondary ring are cleared.
RAS table status
CAUTION
4-12
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