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Loops
Loop Setup
Revision 9 900 Control Station User Guide 149
May 2014
Loop modes
All loop displays indicate the current operating mode of the selected loop. Loop modes are described in
Table 38.
Table 38 Loop modes
Loop mode Meaning
AUTO RSP Loop is controlling the process and Remote Setpoint is selected.
MAN RSP Loop output can only be changed manually. Remote Setpoint is selected.
IMAN RSP IMAN (Initialization Manual) occurs with Cascade loops only.
Figure 11. Secondary Cascade is in MAN or LSP, therefore Primary Cascade
output is tracking Secondary Cascade’s PV. Remote Setpoint is selected.
LO RSP LO (Local Override): loop output is tracking the loop’s Output Tracking value.
Remote Setpoint is selected or High Limit Override Status Is ON.
AUTO LSP Loop is controlling the process and Local Setpoint is selected.
MAN LSP Loop output can only be changed manually. Local Setpoint is selected.
IMAN LSP IMAN (Initialization Manual) occurs with Cascade loops only.
Figure 11. Secondary Cascade is in MAN or LSP, therefore Primary Cascade
output is tracking Secondary Cascade’s PV. Local Setpoint is selected.
LO LSP LO (Local Override): loop output is tracking the loop’s Output Tracking value.
Local Setpoint is selected or High Limit Override is ON.
PID Primary
BCI
PID Secondary
BCO
RSP
When PID Secondary is in Manual
or when Local Setpoint is selected,
PID Primary mode is IMAN. IMAN
causes the PID Primary output to
track the PID Secondary PV.
Figure 11 IMAN loop mode