Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 159

■Disable alarm detection
This function block sets whether to detect alarms (ALM) or not in the variation rate & high/low limiter processing.
Item
Disable alarm detection by setting tag data
Disable alarm detection by control mode selection
Disable alarm detection by loop stop processing
■Hold processing
This function block sets whether to hold M+P_OUT2 outputs or not when a sensor error (SEA) has occurred in M+P_IN, a tag
access FB.
The hold processing is set in the process control extended setting in the engineering tool.
[Options]  [Convert]  [Process Control Extension Setting]  [I/O Control]  [Holding Processing]
• "Yes" is selected for "Hold the output of M+P_OUT1, M+P_OUT2, M+P_DUTY"; Outputs are held.
• "No" is selected for "Hold the output of M+P_OUT1, M+P_OUT2, M+P_DUTY"; The operation continues.
■Loop stop processing
When the stop alarm (SPA) of the alarm (ALM) is TRUE, this function block performs the following processing.
• Outputs (MVN) are held.
• The control mode is automatically switched to MANUAL.
• When DMLA, MHA, or MLA of the alarm (ALM) has occurred, the DMLA, MHA, or MLA is reset.
• No alarm is detected in the variation rate & high/low limiter processing.
■Processing operation
: Performed, : Not performed
Control mode
MAN, CMV
AUT, CAS, CSV
*1 An alarm (ALM) whose corresponding bit is TRUE (detected) is reset, and the alarm will not be detected.
*2 An alarm whose corresponding bit is TRUE (Valid) in the disable alarm detection (INH) is not detected.
Operation error
Error code Description
(SD0)
3400H An invalid operation (such as division by zero) is performed.
3402H Input data (MVP) or operation constant (NMAX, NMIN), or tag data is a subnormal number or NaN (not a number).
3403H An overflow has occurred.
Processing operation
Variation rate & high/low
limiter


9.3 Output Processing-2 with Mode Switching (Without Input Addition) (M+P_OUT2)
Disable alarm detection processing
If the following bits in the disable alarm detection (INH) are TRUE, no DMLA,
MHA, or MLA of the alarm (ALM) will be detected.
• ERRI
• DMLI
• MHI
• MLI
In MAN or CMV mode, DMLA, MHA, and MLA of the alarm (ALM) are reset
and DMLA, MHA, or MLA will not be detected.
Page 157 Loop stop processing
Output conversion


Alarm
*1

*2

9 I/O CONTROL
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