Disconnection Detection Function - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

Disconnection detection function

Detects a disconnection by monitoring the analog output value. This function is enabled only when the analog output range is
4 to 20 mA, 0 to 20 mA or the user range (current). Disconnections can be detected for each channel.
Operation
■Disconnection detection
Disconnections can be when the analog output range is 4 to 20 mA
conversion enable/disable setting' (Un\G500) is set to D/A conversion enable (0).
*1 If the analog output value is 1 mA or less, disconnections cannot be detected.
■Operation performed when disconnection is detected
When a disconnection is detected, 'Disconnection detection flag' (Un\G38) and 'Disconnection detection signal' (Un\G69, b13)
turn on and the disconnection is notified by turning on the ERROR LED.
In addition, when a disconnection is detected, error code 1C4H is stored in 'Latest error code' (Un\G0).
Eliminate the cause of the disconnection from the disconnection state, and perform the following operations depending on the
setting of 'Disconnection Detection Automatic Clear Enable/Disable Setting' (Un\G304)
according to 'CH1 Output enable/disable flag' (Un\G70, b1).
*1 Disconnection detection auto-clear enable/disable setting (Un\G304) is enable only in the normal output mode.
Output mode Disconnection detection automatic clear enable/disable setting (Un\G304)
Disable
Normal output mode Check the CH1 Digital value (Un\G460), and then turn
offonoff 'Error clear request' (Un\G70, b15).
Wave output mode When disconnection is detected, wave output stops.
After turning offonoff 'Error clear request' (Un\G70, b15), set
'CH1 Wave output start/stop request' (Un\G462) as Wave output
start request (1).
• Operation when 'Disconnection detection automatic clear enable/disable setting' (Un\G304) is Disable
Analog output value
Disconnection detection flag (Un\G38, b0)
Disconnection detection signal (Un\G69, b13)
Error clear request (Un\G70, b15)
CH1 Analog output value
0 mA
Disconnection
Removal of cause
ON
OFF
ON
OFF
OFF
Controlled by the analog output module
Controlled by the program
*1
, 0 to 20 mA, or the user range (current)
*1
Enable
Once the cause of the disconnection is eliminated, the analog
output starts automatically.

Detection range
Outside detection range
Restart output
of disconnection
OFF
OFF
ON
OFF
*1
and 'CH1 D/A
. The analog output restarts
Time
2 FX5-4DA
2.4 Functions
2
199