Toshiba T2N - Manual (Page 72)

3.Application Precautions for I/O Modules
User’s manual 57
(1) Use a shielded twisted-pair cable for the analog input signal line, and wire
over the minimum distance. Carry out the grounding of the cable shield on
the analog input side(the T2N side).(1) in the dwawing below is the basic.
Sometimes, operation is more stable if the wiring is as in (2)or(3).
(1)
(2)
(3)
Analog
input
module
Analog
input
module
Analog
input
module
(2) Sometimes the conversion values are unstable,depending on the voltage
state of the external 24Vdc power supply.
If the conversion result is not stable, make the external power supply for
analog use a dedicated power supply.
Use of the 24Vdc external supply power source of the T2N power supply
module is recommended.
(3) All intrinsically shielded cables are fitted with ferrite choke adjacent to
analog inputs/outputs, and must have ground connections to grounded
metalwork within 5cm for applying to the EMC Directive.
3.5
Analog Input Module
Application
Precautions