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CHAPTER 8 FUNCTIONS
8
8.7 Input Signal Error Detection Function
8.7 Input Signal Error Detection Function
Detects any analog input value that is outside the setting range. By using the input signal error detection extension
function, the upper limit detection, lower limit detection, or disconnection detection can be set.
For details on the input signal error detection extension function, refer to the following.
Input signal error detection extension function ( Page 74, Section 8.8)
(1) Notification of input signal error
If the analog input value is above the input signal error detection upper limit value, or below the input signal error
detection lower limit value, the error is notified by Input signal error detection flag (Un\G49), Input signal error
detection signal (XC), and the flashing ALM LED.
In addition, alarm code 110 gets stored in Latest error code (Un\G19).
The alarm code that is stored is shown below:
For details on alarm codes, refer to the following.
• Alarm code list ( Page 163, Section 11.5)
Input signal error
detection upper
limit value
Input signal error
detection lower
limit value
Analog
input value
Time
ON
ON
ON
ON
OFF
OFF
OFF
OFF
CH1 Analog input
value
CH1 Input signal error
detection flag (Un\G49.b0)
Input signal error detection signal (XC)
CH1 A/D conversion
completed flag (Un\G10.b0)
Error clear request (YF)
Normal input value
Included
Error detection
Detected
Not detected
110
Input signal error channel number
Fixed
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