GE FVP110, Руководство по обслуживанию

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FVP 110 Fieldbus Valve Positioner Manual
166
GE Energy
Mode Shedding on Computer Failure
Mode shedding occurs in accordance with the SHED_OPT setting when:
❑
(1) the data status of RCAS_IN, which is the setting received from a computer as
the setpoint SP, falls to Bad while the PID block is running in the RCas (remote
cascade) mode,
or
❑
(2) the data status of ROUT_IN, which is the setting received from a computer as
the remote output signal, falls to Bad while the PID block is running in the ROut
(remote output) mode
Table 51 STATUS_OPTS of PID Block
Available Setting
for SHED_OPT
Actions upon Computer Failure
Normal shed, normal return Sets MODE_BLK.actual to Cas(*1), and leaves MODE_BLK.target unchanged.
Normal shed, no return Sets both MODE_BLK.actual and MODE_BLK.target to Cas(*1).
Shed to Auto, normal return Sets MODE_BLK.actual to Auto(*2), and leaves MODE_BLK.target unchanged.
Shed to Auto, no return Sets both MODE_BLK.actual and MODE_BLK.target to Auto(*2).
Shed to Manual, normal return Sets MODE_BLK.actual to Man, and leaves MODE_BLK.target unchanged.
Shed to Manual, no return Sets both MODE_BLK.actual and MODE_BLK.target to Man.
Shed to retained target,
normal return
If Cas is set in MODE_BLK.target, - sets MODE_BLK.actual to Cas(*1)
and
❑ leaves MODE_BLK.target unchanged.
If Cas is not set in MODE_BLK.target,
❑
sets MODE_BLK.actual to Auto(*2)
and
❑
leaves MODE_BLK.target unchanged.
Shed to retained target, no
return
If Cas is set in MODE_BLK.target, sets:
❑
MODE_BLK.actual to Cas, and
❑ MODE_BLK.target to Cas(*1), too.
If Cas is not set in MODE_BLK.target, sets:
❑ MODE_BLK.actual to Auto(*2), and
❑ MODE_BLK.target to Cas.