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CHAPTER 8 FUNCTION
8
8.11 Alert Output Function
(1) Alert output notification
When the digital value is greater than the alert output upper limit value, or smaller than the alert output lower limit
value, alert notifications are made by Alert output flag (RWrA), Alert output signal (RX1E) and the ALM LED
turning ON.
• Alert output flag (RWrA): The bit corresponding to the alert is on. ( Page 159, Appendix 2 (4))
• Alert output signal (RX1E): ON
• ALM LED: ON
In addition, alarm code 0A gets stored in Latest warning code (RWr1).
The alarm code that is stored is shown below:
(2) Operation of the alert output function
When the digital value exceeds the alert output upper limit value or is below the alert output lower limit value, an
alert is output and the analog output value becomes any of the following:
• When the digital value exceeds the alert output upper limit value: An analog value converted from the digital
value of the alert output upper limit value is output.
• When the digital value is below the alert output lower limit value: An analog value converted from the digital
value of the alert output lower limit value is output.
After an alert occurs, the analog output value returns to the normal value by changing the digital value to a value
within the setting range. However, Alert output flag (RWrA) and Alert output signal (RX1E) are not cleared. (The
ALM LED remains ON.)
(3) Clearing the alert output
The alert output can be cleared by either of the following two methods.
• Turning on and off Alert output clear request flag (RY1E)
• Turning on and off Initial data setting request flag (RY9)
When the alert output is cleared, the D/A converter module results in the following state:
• Alert output flag (RWrA) is cleared.
• Alert output signal (RX1E) turns off.
• The ALM LED turns off.
• The alarm code 0A , which is stored in Latest warning code (RWr1), is cleared.
(4) When the scaling function is set enabled
When Scaling enable/disable setting (address: 010E
H
) is set to Enable (0), the scale-converted digital value is
the target for the alert.
When setting CH1 Alert output upper limit value (address: 0106
H
) to CH4 Alert output lower limit value (address:
010D
H
), set values considering the scaling range.
0A
The last digit indicates the channel where the alert has occurred.
The second digit from the end indicates the condition of the alert as below.
1: Alert occurrence (lower limit)
0: Alert occurrence (upper limit)
Fixed