6. PARAMETER SETTING MODE
IMR01N12-E7
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6.3 Description of Each Parameter
Event 1 set value (EV1) Event 2 set value (EV2)
Event 3 set value (EV3) Event 4 set value (EV4)
EV1 to EV4 are set values of the Event action.
Data range:
Deviation:
Input span to
Input span
Process: Input scale low to Input scale high
SV:
Input scale low to Input scale high
Factory set value:
50.0
For the 2-input controller, EVs have to be allocated to either Input 1 or Input 2 (Factory set value:
allocated to Input 1). Refer to “Event assignment” in F41 to F44 of the Engineering mode (P. 84).
Control loop break alarm (LBA) time (LbA1, LbA2)
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:
OFF (Unused), 1 to 7200 seconds
Factory set value:
480
For the 2-input controller, LBAs have to be allocated to either Input 1 or Input 2 (Factory set value:
allocated to Input 1). Refer to “Event assignment” in F41 t to F44 of the Engineering mode (P. 84).
LBA 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.
[Alarm action]
LBA determination range:
TC/RTD input:
2
C [2
F] (fixed)
Pressure sensor input and Voltage/Current input: 0.2 % of input span (fixed)
When the output reaches 0 % (low limit with output limit function)
For direct action: When the LBA time has passed and the PV has not risen beyond the
alarm determination range, the alarm will be turned on.
For reverse action: When the LBA time has passed and the PV has not fallen below the
alarm determination range, the alarm will be turned on.
When the output exceeds 100 % (high limit with output limit function)
For direct action: When the LBA time has passed and the PV has not fallen below the
alarm determination range, the alarm will be turned on.
For reverse action: When the LBA time has passed and the PV has not risen beyond the
alarm determination range, the alarm will be turned on.
If the Autotuning function is used, the LBA time is automatically set twice as large as the Integral
time. The LBA setting time will not be changed even if the Integral time is changed.
