Input Hold/Clear Function - Mitsubishi Electric MELSEC iQ-RX40NC6B Application User's Manual

Input HOLD/CLEAR function

This function allows setting whether to hold or clear the input status just before an error (alarm, minor error, or moderate error)
when the error is detected in the input module with diagnostic functions.
Depending on whether "Input HOLD/CLEAR function enable/disable" is enabled or disabled, the input module with diagnostic
functions operates differently when an error is detected.
Input HOLD/CLEAR function enable/
disable
HOLD/CLEAR setting
Input status just before
an error
*1 When a moderate error is detected, the input status remains on.
The following table lists the target inputs to be held or cleared for each type of detected errors.
Detected error
*2
Alarm
Minor error, moderate error
*2 When an alarm is detected, 'Alarm flag' (X11) turns on.
*3 When a minor error or moderate error is detected, 'Error flag' (X10) turns on.
• When 'Alarm flag' (X11) turns on, the input is held or cleared. When 'Alarm flag' (X11) turns off, the HOLD/CLEAR state is
cleared.
• When 'Error flag' (X10) turns on, the input is held or cleared. When 'Error flag' (X10) turns off, the HOLD/CLEAR state is
cleared.
• When both 'Alarm flag' (X11) and 'Error flag' (X10) turn on, the HOLD/CLEAR state is cleared when both the flags turn off.
When only one of them turns off, the HOLD/CLEAR state is not cleared.
Ex.
Operation of when "Input HOLD/CLEAR function setting" is set to "CLEAR"
• When the external input remains on
'Error flag' (X10)/'Alarm flag' (X11)
External input (X0)
Input to the CPU module (X0)
• When the external input turns off
'Error flag' (X10)/'Alarm flag' (X11)
External input (X0)
Input to the CPU module (X0)
1 FUNCTIONS
22
1.1 Input Function
Enable (default)
CLEAR
OFF OFF
*1
ON OFF
Target input to be held or cleared
Only the input with an alarm
*3
All inputs
ON
OFF
ON
ON
OFF
ON
OFF
ON
ON
OFF
Disable
HOLD (default) CLEAR/HOLD (default)
OFF OFF
ON ON
OFF