GE Valve Software Tools MN-Valvue-FF-IOM Service Manual Page 235

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219
Transferring to Manual State
Foundation Fieldbus
Transferring to Manual State
Use this procedure to transfer to the manual state which allows ValVueFF to adjust the
valve position. The Device Operation State dialog box is shown in Figure 179.
1. Select Tools > Device Operating State from the drop down menu or select the
Change Device Operation State icon.
2. Select Manual.
3. Enter a Set Point or drag the Set Point slider to the desire value.
4. Select OK. If the positioner is configured with a non-linear (such as =%)
characteristic the Target Position is computed from the Set Point but can differ in
value. The configuration options of Tight Shutoff Below, Full Open Above, as well as
high and low position limits are applied to the Set Point to arrive at the correct Target
Position.
When the positioner has been placed in normal it waits for the PID block to begin to
send it a Set Point. It remains in Auto Mode at the current valve position. When this
condition exists it is necessary to place the PID block in it's normal mode.
When the process control PID is located within the positioner and the PID receives it's
Set Point from a Foundation Fieldbus function block the normal state is shown in
Figure 182. Both the PID and Analog Output Block (AO)s are in Cas mode.
PID single loop control Auto Auto CAS Auto
PID cascade loop control
Auto
Primary: Auto
Secondary: CAS
CAS Auto
Table 19 Mode Operation (Continued)
Operation (AI) PID AO TB
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