Disconnection Detection Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

1.12

Disconnection Detection Function

The R60DA4 and R60DAI8 can detect a disconnection by monitoring the analog output value. This function is enabled only
when the analog output range is 4 to 20mA. A disconnection can be detected for each channel.
Analog output value
0mA
Disconnection detection
flag (Un\G38.b0)
Disconnection detection
signal (XD)
Error clear request (YF)
Operation
■Disconnection detection
A disconnection can be detected when the analog output range is 4 to 20mA and 'CH1 D/A conversion enable/disable setting'
(Un\G500) is set to D/A conversion enabled (0).
■Operations performed when a disconnection is detected
When a disconnection is detected, the disconnection is notified by turning on 'Disconnection detection flag' (Un\G38),
'Disconnection detection signal' (XD), and the ERR LED.
In addition, an error code (1C4H) is stored in 'Latest error code' (Un\G0).
Even if the disconnection cause is eliminated, the analog output does not restart automatically to prevent an incorrect output.
To restart the analog output, check 'CH1 Digital value' (Un\G460) and turn on and off 'Error clear request' (YF). According to
the status of 'CH1 Output enable/disable flag' (Y1), the analog output restarts.
When the analog output restarts, 'Disconnection detection flag' (Un\G38) of the corresponding channel is cleared. When the
analog output of all the channels restarts, 'Disconnection detection signal' (XD) is cleared.
1 FUNCTIONS
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1.12 Disconnection Detection Function
CH1 Analog
output value
Threshold of
disconnection detection
Disconnection
detection
ON
OFF
ON
OFF
OFF
Controlled by the D/A converter module
Controlled by the program
Within the detection range
Outside the detection range
Included
Resume output
Was removed and
the disconnection
cause
OFF
OFF
ON
OFF
Time