Chapter 13 Built-in Analog Function
13.5.4 Detection Alarm (Input Disconnection)
In case that Input voltage (1 to 5 VDC) or Input current (4 to 20 mADC) is chosen with analog input range, the analog
input module has diagnostic function by checking disconnection and showing. If the module shows disconnection, that
means the parts of connections in the wiring connection are faulty. If so, check and take action.
(1) Detection conditions
When input signal range of 4 to 20 mA and 1 to 5 V is used, disconnection of input circuit can be detected. The
detection conditions of each input signal range are as below.
Voltage/Current recognized as a disconnection
㎃
㎃
(2) When between used wiring and module is disconnected, the LED will be turned on/off 1s intervals.
(3) Each channel can detect disconnection. However, Disconnection is only displayed for specified operation channel.
The LED can commonly use the channel from 0 to 1. If one or more channel is disconnected, LED will be turned
on/off.
Normal
Input wiring is disconnected or
Input is not connected.
Operation
Flickering
(1s intervals)
On
(4) In case of disconnection, disconnection flag of relevant channel will turn on and In case of connection,
disconnection flag of relevant channel will turn off.
On: Disconnection
(5) In case of disconnection, the input value displays the lowest value among each input range.
To Next Page
Loading...
Need help?
General
