110
Application Procedure
Section 6-4
Refer to the following information if a disconnection occurs while using volt-
age input.
Example: If connected device 2 is outputting 5 V and the power supply is
shared between two inputs, as shown in the above diagram, approximately
1.6 V (or a third) is generated at input 1.
If an input is disconnected while using a voltage input, the conditions
described below will occur. Either use separate power supplies for the con-
nected devices or use isolators to isolate each input.
If connected devices share a power supply and a line is disconnected at A or
B, the unwanted path shown by the broken line in the above diagram will
occur, and the output voltage of other connected devices will drop to around a
third to half the voltage. If using the 1 to 5-V range when this type of voltage is
generated, detection of a line disconnection will not be possible. Also, a line
disconnection cannot be detected if the line is disconnected at C, because the
negative side (–) is shared.
If a current input is used, the power supply can be shared by the connected
devices without any problem.
Note When the external power supply is turned ON (and the range code has been
set) or when the power is disconnected, a pulse analog output of 1 ms maxi-
mum may occur. If this situation causes a problem, use measures such as the
following ones.
• Turn ON the power to the CPU Board, check the RUN status, and then
turn ON the power to the load.
• Turn OFF the power to the load, and then turn OFF the power to the CPU
Board.
(A)
Con-
nected
device 1
Con-
nected
device 2
(B)
(C)
24 V DC
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