Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 158

CH1 Loop disconnection detection judgment time
Set the loop disconnection detection judgment time constant.
For loop disconnections, the amount of change to the process value (PV) is detected for each loop disconnection detection
judgment time from when the manipulated value (MV) is either 100% (or the upper limit output limiter) or greater, or 0% (or the
lower limit output limiter) or lower, and the loop disconnection alert turns ON when it is judged that a control loop error has
occurred. For details of the loop disconnection detection function, refer to the following.
Page 61 Loop Disconnection Detection Function
■Buffer memory address
The following table shows the buffer memory address of this area.
Buffer memory name
CH Loop disconnection detection judgment time
CH Loop disconnection detection judgment time (If using FX3 allocation
mode)
■Setting range
The setting range is 0 to 7200 (s). Set to 0 to turn OFF this function.
■When executing the auto tuning
A value that is twice as large as the value in 'CH1 Integral time (I) setting' (Un\G432) is automatically set in this setting.
■Default value
The default value is 480 (s).
CH1 Loop disconnection detection dead band
Set the non-alert area having the set value (SV) at the center (temperature width in which no loop disconnection is detected)
to prevent accidental alerts of the loop disconnection detection.
For details on the loop disconnection detection function, refer to the following.
Page 61 Loop Disconnection Detection Function
■Buffer memory address
The following table shows the buffer memory address of this area.
Buffer memory name
CH Loop disconnection detection dead band
CH Loop disconnection detection dead band (If using FX3 allocation mode)
■Setting range
*1
0 to input span
*1 During internal temperature inputs, input range span. During internal micro voltage inputs, scaling span. During external inputs, external
input span.
■Setting unit
The value to be set differs depending on the value stored in 'CH1 Decimal point position' (Un\G400).
• No decimal point (0): Set a value in increments of 1 ( or digit).
• If there is 1 digit (1) past the decimal point: Set a value (the value multiplied by 10) in increments of 0.1 ().
■Default value
The default value is 0.
APPX
156
Appendix 4 Buffer Memory Areas
CH1 CH2
537 737
78 118
CH1 CH2
538 738
79 119
CH3 CH4
937 1137
158 198
CH3 CH4
938 1138
159 199