JUMO iTRON B 70.2040 Operating Instructions Manual page 29

Symbol Notes
C121 Start condition of the timer
The timer start value
1. Power ON or logic input/keys
2. Start via keys/logic input
3. Process value has reached tolerance limit (1°C or 5°C) (start via keys/logic input)
The position of the tolerance limit depends on the controller type:
- 1-setpoint controller (direct): tolerance limit above setpoint
- 1-setpoint controller (reversed): tolerance limit below setpoint
- 2-setpoint controller: tolerance limit below setpoint
If, during the control process, the process value goes above/below the tolerance limit, the
timer will be stopped for the duration of the infringement.
Response to a power failure
After a power failure, the condition before the power failure can be restored, or the
timer function can be cancelled. If the timer had run down before the power failure, the timer
start value will be loaded. The timer will start automatically when C121=1 or 5.
The timer value is saved at one minute intervals, to cover the case of a power failure.
C122 Timer signalling
From the start of the timer function until timer run-down, or after the run-down, a signal can be
produced via an output.
C123 Time unit for the timer
vpage 34
t i 0
is counted down as selected in the following events:
vpage 34
vpage 35
vpage 35
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