8. PARAMETER DESCRIPTION
IMR02C15-E4
8-32
Control loop break alarm (LBA) time
Factory default setting:
The screen is displayed.
The LBA time sets the time required for the LBA function to determine there is
a loop failure. When the LBA is output (under alarm status), the LBA function
still monitors the Measured value (PV) variation at an interval of the LBA time.
Data range Factory set value
0 to 7200 seconds
(0: Unused)
480
LBA displays when PID control is specified and the value “11: Control
loop break alarm (LBA)” is set to Event 1 type (ES1) through Event 4
type (ES4) (P. 8-101) at Function blocks from F41 to F44 in the
Engineering mode.
LBA is not displayed when Heat/Cool PID control is specified.
LBA is not displayed when the block selection at F07 [S.F07] (P. 8-79) is
set to “1: No display” in the Engineering mode.
Related parameters
Parameter setting mode:
• LBA deadband (LBD) (P. 8-34)
Engineering mode:
• Control loop break alarm (LBA) time (P. 8-78)
Description of function
The Control loop break alarm (LBA) function is used to detect a load (heater) break or a failure in the
external actuator (power controller, magnet relay, etc.), or a failure in the control loop caused by an
input (sensor) break. The LBA function is activated when control output reaches 0 % (low limit with
output limit function) or 100 % (high limit with output limit function). LBA monitors variation of the
Measured value (PV) for the length of LBA time. When the LBA time has elapsed and the PV is still
within the alarm determination range, the LBA will be ON.
Continued on the next page.
LBA
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