Status_Opts; Auto Fallback; Status_Opts Of Pid Block - GE FVP110 Maintenance Manual

STATUS_OPTS

STATUS_OPTS
Table 50 shows the options in STATUS_OPTS.
Bit Options in CONTROL_OPTS
IFS if BAD IN
0
IFS if BAD CAS IN
1
Use Uncertain as Good
2
Target to Manual if BAD IN
5
Target to next permitted mode
9
if BAD CAS IN

Auto Fallback

Auto fallback is when a PID block changes mode from Cas to Auto and continues
automatic PID control with the user-set setpoint. To enable the auto fallback action to
take place:
❑
The Target to next permitted mode if BAD CAS IN option must be preset to true
in STATUS_OPTS.
AND
❑
Auto must be preset in MODE_BLK.permitted.
If the above settings are made, auto fallback takes place automatically when the
following condition is met:
❑
CAS_IN.status (data status of cascade setpoint) is Bad except when the control
action bypass is on.
Table 50 STATUS_OPTS of PID Block
Sets the sub-status component of OUT.status to IFS if IN.status
is Bad except when PID control bypass is on.
Sets the sub-status component of OUT.status to IFS if
CAS_IN.status is Bad.
Does not regard IN as being in Bad status when IN.status is
Uncertain (to prevent mode transitions from being affected
when it is Uncertain).
Automatically changes the value of MODE_BLK.target to Man
when IN falls to Bad status.
Automatically changes the value of MODE_BLK.target to Auto
(or to Man if Auto is not set in Permitted) when CAS_IN falls to
Bad status.
165
PID Function Block
Description