YOKOGAWA CENTUM CS, Technical Information

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3. Cabling
3-90
TI 33J01J10-01EN
n
A2SMX802 Pass-through I/O signal adaptor
CAUTION
When you connect an inductive load, connect a diode in parallel with the load.
For current input from a 4-wire transmitter, when connecting the field signals via the terminal
board, it is necessary to connect the field power supply - to the terminal-B on the external
terminal block.
The following figure shows the signal wiring to the base plate when you use the pass-through I/O
signal adaptor
F030724.ai
When connecting a current input from a 3-wire transmitter
When connecting an open drain (DO sink)
Field power
Current input +
Current input -
When connecting a current input from a 4-wire transmitter
(Direct field wiring to base plate)
Field power
Current input +
Current input -
Field power supply -
‒
+
: Load

A

B

C

D

A

B

C

D

A

B

C

D

A

B

C

A

B

C

A

B

C

A

B

C

D
Power supply input -
Power supply input +
Field power supply -
Field power
When connecting a current input from a 4-wire transmitter
(Field connection via the terminal board)
A2BN3D-

9 A2BM4 External terminal block

: 1 to 16
Figure When using the pass -through i/o signal adaptor A2SMX 802
TIP
When using A2SMX802, connect the field power supply to the base plate.
When mounting A2SMX802 to the base plate, each channel between A2SDV105, A2SDV505, and A2SMX801 is
not insulated.
For details of the Fieldbus connection and wiring work, refer to “Fieldbus Technical Information” (TI
38K03A01-01E).
Oct. 5, 2018-00