47
Figure 5-19 Schematic diagram of
deviation high/low
5.3.3 Alarm delay
When the deviation between the measured value PV and the set value SV reaches the alarm
setting value, the alarm delay function will remain in the non-alarm state. No alarm will be given
until the number of input samples exceeds the number of alarm delay.
For example, when the number of alarm delay is set to 5, it is shown in figure 5-20:
Figure 4-20 Alarm delay time
5.4 Multi-step function
MTC can perform multi-step function. When the temperature of each section of the channel is set to a
given value, the execution time of each section, the repeating start segment, the repeating end segment,
and the repeating number of times, the corresponding bit of the multi-step set execution mark (BFM#552)
is written as 1, then MTC starts to perform multi-step set value execution, starting from the first segment,
until the end of the eighth segment. The set value will be maintained at the set value of paragraph 8 after
the multi-step execution. In the process of multi-step function execution, changing the 1 in the setting of
multi-step setting function start up (BFM#552) to 0 will terminate multi-step execution. After rewriting 1,
the multi-step function is restarted from paragraph 1. Self-tuning cannot be used when using multi-step
Setting.
Note: the setting value for the repeating start step must not be greater than the setting value for
the repeating end step.
