Mitsubishi Electric MELSEC iQ-R Series User Manual page 33

Judgment of rate alarm
A change rate is judged with the following formulae every rate alarm alert detection cycle.
• For alert outputting of rate alarm upper limit
Measured temperature value of this time - Measured temperature value of previous detection cycle  Rate alarm upper limit
value
• For alert outputting of rate alarm lower limit
Measured temperature value of this time - Measured temperature value of previous detection cycle  Rate alarm lower limit
value
Ex.
Judgment of rate alarm for the thermocouple input module, with the following conditions
• Conversion enabled channel: CH1
• CH1 Range setting (Thermocouple type): K thermocouple
• CH1 Averaging process specification: Sampling processing
• Rate alarm alert detection cycle setting: 5 (times)
• CH1 Rate alarm upper limit value: 10000 (1000.0)
• CH1 Rate alarm lower limit value: 3200 (320.0)
A measured temperature value of this time is compared to the previous value (measured temperature value 150ms before),
every rate alarm alert detection cycle of 150ms (30ms  5). From the comparison, whether the increase in the measured
temperature value is 10000 (1000.0) or more, or 3200 (320.0) or less is judged.
Detection target for outputting an alert
'CH1 Measured temperature value' (Un\G400) is a target for outputting an alert. The target is the same for when the scaling
function is enabled.
1 FUNCTIONS
1.6 Alert Output Function
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