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

1.12

Disconnection Detection Function

Normal
This function allows detecting the disconnection by monitoring the analog output value. This function is enabled only when the
output range is 4 to 20mA. A disconnection can be detected for each channel.
Analog output value
(1) 0mA
CH1 Disconnection
detection flag (Un\G38.b0)
'Disconnection
detection signal' (XD)
'Error clear request' (YF)
Performed by the D/A converter module
Performed by a program
(1) Disconnection detection threshold
(2) Disconnection detection
(3) Elimination of the cause of disconnection
(4) Restart of analog output
Operation
A disconnection can be detected when the output range is 4 to 20mA and 'CH1 D/A conversion enable/disable setting'
(Un\G500) is set to D/A conversion enabled (0). Disconnection occurs when the analog output value falls to the disconnection
detection threshold or less.
The detected disconnection is notified by the following.
• Disconnection detection (1) is stored in 'Disconnection detection flag' (Un\G38).
• 'Disconnection detection signal' (XD) turns on.
• The ERR LED turns on.
When a disconnection is detected, a disconnection detection error (error code: 1C4H) is stored in 'Latest error code'
(Un\G0).
1 FUNCTIONS
40
1.12 Disconnection Detection Function
Wave
(2)
Disconnection
ON
OFF
ON
OFF
OFF
Synchronization
Detection range
Out of detection range
Included
(4)
Time
OFF
OFF
ON
OFF
(3)