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

Disconnection Detection Function

Simple disconnection detection is performed.
This function is enabled when the analog input range is 1 to 5 V or 4 to 20 mA.
Setting procedure
1.
Set "Disconnection detection enable/disable setting" to "Enable".
Navigation window  [Parameter]  [Module Information]  Module model name  [Module Parameter]  "Application
Settings"  "Disconnection detection enable/disable setting"
2.
Set "Disconnection recovery detection enable/disable setting".
Navigation window  [Parameter]  [Module Information]  Module model name  [Module Parameter]  "Application
Settings"  "Disconnection recovery detection enable/disable setting"
Corresponding devices
The devices which are used by the disconnection detection function are listed below.
Name
Disconnection detection flag
Disconnection detection enable/disable setting
Disconnection recovery detection enable/
disable setting
Disconnection detection condition
The table below shows the disconnection detection condition and disconnection recovery condition.
Input range
1 to 5 V
4 to 20 mA
Operation
When the input voltage or input current reaches the disconnection detection condition in a channel for which the "A/D
conversion enable/disable setting" is set to "enable" and the "disconnection detection recovery enable/disable setting" is set
to "enable", it is regarded as disconnection. As a result, alarm occurs and the "disconnection detection flag" turns ON (Alarm
code: 0A0H).
The A/D conversion completion flag" turns OFF, A/D conversion is interrupted, and the later processing is not executed in the
disconnected channel.
When the "A/D conversion enable/disable setting" is set to "enable", the "disconnection detection flag" turns OFF when the
channel is recovered from disconnection. When the channel is recovered from disconnection, A/D conversion is restarted.
When the "A/D conversion enable/disable setting" is set to "disable", the "disconnection detection flag" remains ON. It is
necessary to set the "alarm clear request" to ON to turn OFF the "disconnection detection flag". The "disconnection detection
flag" turns OFF also when the "disconnection detection recovery enable/disable setting" is changed to "disable".
The range setting range error with disconnection detection enabled (Error code: 1AAH) occurs when the input range of a
channel for which the "disconnection detection enable/disable setting" is set to "enable" is set outside "1 to 5 V" or "4 to 20
mV".
CH1 CH2
SM6318 SM6358
SM6319 SM6359
SM6320 SM6360
Disconnection detection condition
Analog input value0.5 V
Analog input value2 mA
CH3 CH4
SM6398 SM6438
SM6399 SM6439
SM6400 SM6440
Disconnection recovery condition
Analog input value>0.5 V
Analog input value>2 mA
2
Reference
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2.3 Functions