
1/03 UDC 6300 Process Controller Product Manual 155
5.6 Operating Modes, Continued
What happens when
you change modes
Table 5-8 explains what happens to the controller when you switch from
one mode to another.
Table 5-8 Changing Operating Modes
Mode Change Description
Manual to Automatic
Local Setpoint
The local setpoint is usually the value previously
stored as the local setpoint.
PV Tracking is a configurable feature which modifies
this. When it is selected, the local setpoint value
tracks the process variable value continuously while
in manual. LSP=PV at the moment you switch from
manual to automatic. LSP holds at this one value.
Manual or Auto Local
to Automatic Remote
SP
The Remote setpoint value with Ratio and Bias
applied is used to calculate the control setpoint.
Auto Bias is a configurable feature which modifies
this. When it is selected, the transfer from automatic
local to automatic remote or from manual remote to
auto remote adjusts the Bias based on the local
setpoint such that Bias = LSP - [RSP Input x R].
Automatic Remote SP
to Manual or Auto
Local Setpoint
If configured for Local Setpoint Tracking, when the
UDC transfers out of remote setpoint, the last value of
the control setpoint is inserted into the local setpoint.
If LSP tracking is not configured, the local setpoint will
not be altered when the transfer is made.
Continued on next page
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