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Analog Input Functions and Operating Procedures Section 6-6
6-6-4 Input Disconnection Detection Function
When an input signal range of 1 to 5 V (4 to 20 mA) is used, input circuit dis-
connections can be detected. The detection conditions for each of the input
signal ranges are shown in the following table.
The current/voltage level will fluctuate according to the offset/gain adjustment.
The input disconnection detection signals for each input number are stored in
bits 04 to 07 of CIO word n+9. Specify these bits as execution conditions to
use disconnection detection in the user’s program.
For the CIO word addresses, n = CIO 2000 + (unit number x 10).
The conversion value during a disconnection will be 0000.
In the following example, the conversion value is read only if there is no dis-
connection at analog input number 1. (The unit number is 0.)
Range Current/voltage
1 to 5 V 0.3 V max.
4 to 20 mA 1.2 mA max.
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Bit
Input 2
Input 1
Word n+9
The respective bit turns ON when a
disconnection is detected for a given
input. When the disconnection is
restored, the bit turns OFF.
Input 4
Input 3
MOV (021)
2005
D00001
200904
The conver-
sion value in
CIO word
2005 (input
number 1) is
read to
D00001.
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