<Appendix 5. PID Block>
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IM 01E21A02-03EN
A5.14 Initialization and Manual Fallback (IMan)
Initialization and manual fallback denotes an abnormality processing function in which the PID
block changes mode to IMan (initialization and manual) and suspends the control action. The
function operates when the initialization and manual fallback conditions (IMan condition) are met.
A5.14.1 IMan condition
The IMan conditions are transition conditions of the mode to temporarily suspend control action
by changing the block mode to the IMan mode.
Please note that the IMan mode is the mode to transition only when the IMan conditions are
established.
A5.14.2 Establishment of IMan condition
The IMan conditions are established in the following cases.
• When quality=BAD in Data status of BKCAL_IN (Status).
• When substatus=Good(c)-FSA, LO, NI and IR in Data status of BKCAL_IN (Status).
A5.15 Manual Fallback
MAN fallback denotes an abnormality processing function in which the PID block changes a
mode to Man and suspends the control action.
A5.15.1 Condition of MAN Fallback
The condition is established when the input data status (IN.Status) is BAD.
(Excluding when BYPASS)
A5.15.2 Specification of MAN Fallback
Specifies Target to Manual if BAD IN with STATUS_OPTS.
A5.15.3 STATUS_OPTS
The table below shows settings of STATUS_OPTS.
Options in STATUS_OPTS
Setting Contents
IFS if BAD IN
Sets the sub-status component of OUT.status to IFS if IN.status is Bad. Does not
set while PID control bypass is on.
IFS if BAD CAS IN
When CAS_IN.Status is BAD, the substatus of OUT.Status is set to IFS.
Use Uncertain as Good
When IN.Status is Uncertain, tries not to handle as BAD. (When IN.Status is
Uncertain, tries not to influence on mode transfer.)
Target to Manual if BAD IN
When IN becomes BAD, automatically changes MODE_BLK.Target to MAN.
Target to next permitted
mode if BAD CAS IN
When CAS_IN becomes BAD, changes MODE_BLK.Target to Auto. (When Auto
is not permitted as the destination of transition by Permitted, the destination of
transition is changed to Man.)
