Loop Modes; Table 38 Loop Modes; Figure 11 Iman Loop Mode - Honeywell 900 User Manual

Loop modes

All loop displays indicate the current operating mode of the selected loop. Loop modes are described in
Table 38.
Loop mode
AUTO RSP
MAN RSP
IMAN RSP
LO RSP
AUTO LSP
MAN LSP
IMAN LSP
LO LSP
Revision 9
May 2014

Table 38 Loop modes

Loop is controlling the process and Remote Setpoint is selected.
Loop output can only be changed manually. Remote Setpoint is selected.
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 (Local Override): loop output is tracking the loop's Output Tracking value.
Remote Setpoint is selected or High Limit Override Status Is ON.
Loop is controlling the process and Local Setpoint is selected.
Loop output can only be changed manually. Local Setpoint is selected.
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 (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
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

900 Control Station User Guide
Meaning
PID Secondary
RSP
BCO
Loops
Loop Setup
149