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(3) When an alert occurs, or does not occur
If an alert for the loop disconnection detection occurs, CH Alert occurrence flag (XnC to XnF) and CH Loop
disconnection detection (b13 of Un\G5 to Un\G8) turn on and Alarm code (03A
H
) is stored in Write data error
code (Un\G0). ( Page 370, Section 8.7)
If an alert for the loop disconnection detection does not occur and auto tuning is normally completed, the value in
CH Loop disconnection detection judgment time (Un\G59, Un\G91, Un\G123, Un\G155) is automatically
updated to the value calculated by auto tuning.
There is a possibility of an error in the control loop if the loop disconnection alert occurs. For this reason, even when auto
tuning is normally completed, check the control loop and examine the appropriateness of the loop disconnection detection
judgment time during auto tuning.
(4) To clear the alert status
If any of the following conditions is met, CH Alert occurrence flag (XnC to XnF) and CH Loop disconnection
detection (b13 of Un\G5 to Un\G8) turn off.
•CH PID control forced stop instruction (YnC to YnF) is turned on from off.
• Setting/operation mode instruction (Yn1) is turned off from on and the mode has shifted to the setting mode.
• A manipulated value (MV) becomes greater than the lower limit output limiter value and smaller than the
upper limit output limiter value.
• Disable (0) is set to During AT loop disconnection detection function enable/disable setting (Un\G571).
• 0 is set to CH Loop disconnection detection judgment time (Un\G59, Un\G91, Un\G123, Un\G155).
• MAN (1) is set to CH AUTO/MAN mode shift (Un\G50, Un\G82, Un\G114, Un\G146).
After performing the operations above, turn on and off Error reset instruction (Yn2) to clear the value in Write data
error code (Un\G0).