Mitsubishi Electric NZ2EX2B-60AD4 - Page 108

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(1) Process alarm notification
(a) For the main A/D converter module
If a digital operation value enters the alert output range, being equal to or greater than the process alarm upper
upper limit value, or being equal to or less than the process alarm lower lower limit value, Alert output flag
(RWrB), Alert output signal (RX18), and the turning on of the ALM LED of the main module notify an alert.
• Alert output flag (RWrB): The bit corresponding to the contents of the alert turns on. ( Page 203,
Appendix 2 (6))
• Alert output signal (RX18): On
• ALM LED of the main module: On
In addition, the alarm code 0A is stored in Latest warning code (RWr1).
(b) For the extension A/D converter module
If a digital operation value enters the alert output range, being equal to or greater than the process alarm upper
upper limit value, or being equal to or less than the process alarm lower lower limit value, Alert output flag
(RWr1B), Alert output signal (RX28), and the turning on of the ALM LED of main module notify an alert.
• Alert output flag (RWr1B): The bit corresponding to contents of the alert turns on. ( Page 203,
Appendix 2 (6))
• Alert output signal (RX28): On
• ALM LED of the main module: On
In addition, the alarm code 1A is stored in Latest warning code (RWr1).
For details on alarm codes, refer to the following:
• Alarm Code List ( Page 180, Section 11.3)
(2) How the alert output function (process alarm) operates
After alert output, if a digital operation value enters the alert output set range, being less than the process alarm
upper lower limit value, or being greater than the process alarm lower upper limit value, "0" is stored in the bit
position corresponding to the channel number of Alert output flag (RWrB, RWr1B).
Once all the channels return to within the set range, Alert output signal (RX18, RX28) turns off and the ALM LED
goes off.
(3) Detection cycle
When time average is specified, the function is executed per set time (for averaging). When count average is
specified, the function is executed per set count (for averaging).
In addition, when sampling processing and moving average are specified, the function is executed per sampling
cycle.
(4) Clearing the alarm code
When a digital operation value enters the range "Process alarm lower upper limit value < Digital operation value
< Process alarm upper lower limit value", the alarm code (0AH or 1AH) stored in Latest warning code
(RWr1) is automatically cleared.
(5) Alert output target
Alert output target is CH Digital operation value (RWr2 to RWr5, RWr12 to RWr15).
When using the digital clipping function, scaling function, shift function, and difference conversion function, set
values considering these functions for the process alarm upper upper limit value, upper lower limit value, lower
upper limit value, and lower lower limit value.