Mitsubishi Electric R60AD8-G - Page 44

42
1 FUNCTIONS
1.7 Input Signal Error Detection Function
Ex.
The following figure shows the operation when an analog input value falls below 2.4mA and returns within the normal range
under the following condition.
• 'Input signal error detection auto-clear enable/disable setting' (Un\G302): Enable (0)
• Input range: 4 to 20mA
• 'CH1 Input signal error detection setting' (Un\G528): Upper and lower limit detection (1)
• Input signal error detection lower limit value: 2.4mA
■When Input signal error detection auto-clear enable/disable setting is set to Disable (1)
After the analog input value returns within the set range, turn on and off 'Error clear request' (YF).
The A/D converter module arranges the following status when an input signal error is cleared.
• 'Input signal error detection flag' (Un\G40) is cleared.
• 'Input signal error detection signal' (XC) turns off.
• The ALM LED turns off.
• 'Latest alarm code' (Un\G2) is cleared.
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
Input signal error detection
upper limit value
Input signal error detection
lower limit value
(2.4mA)
Analog input value
Time
Error
detected
'CH2 Input signal error detection flag'
(Un\G40, b1)
'CH1 Input signal error detection flag'
(Un\G40, b0)
'Input signal error detection signal'
(XC)
ALM LED
Normal
input value
Error
detected
Controlled by the A/D converter module
FlashingLights out Lights out
Controlled by the program
Detection range
Out of detection range
Included
CH1 analog
input value
CH2 analog
input value
'CH1 A/D conversion completed flag'
(Un\G42, b0)
'CH2 A/D conversion completed flag'
(Un\G42, b1)