YOKOGAWA CENTUM CS, Technical Information

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3. Cabling
3-96
TI 33J01J10-01EN
n
Signal connection of the terminal block of the nest for I/O adaptor
A2BA3D
The signal cables of the field devices to the terminal block that is mounted on the nest for I/O
adaptor must be connected to different terminals depending on the types of signals. To prevent
damage to the devices, connect signal cables to the appropriate terminals according to the type
of signals.
The following table shows the relationship between signal types and terminal numbers of
channels.
Table Terminal numbers and signal types
Adaptor
(model)
Terminal
number
(*1)
Signal type (*2)
Case 1 Case 2 Case 3 Case 4 Case 5
Current input/
voltage
input adaptor
(A2SAM105)
(*3)

A (*4)
2-wire
transmitter
input +
— — — —

B
2-wire
transmitter
input -
4-wire
transmitter
current input
+
Voltage input
+
— —

C —
4-wire
transmitter
current input
-
Voltage input
-
— —
Current
output/voltage
output adaptor
(A2SAM505)

A
Current Voltage
— — —

B
— — — — —

C
Current
output -
Voltage
output -
— — —
mV/TC/RTD
input
adaptor
(A2SAT105)

A
—
RTD input A
(*5)
Potentiometer
input, 100%
(*5)
— —

B
TC/mV input
+
RTD input B
Potentiometer
input, variable
— —

C
TC/mV input -
RTD input B
(*5)
Potentiometer
input, 0% (*5)
— —
Pulse input
signal
adaptor
(A2SAP105)
(*6)

A —
Dry contact
input +
(*7) (*8)
—
2-wire power
supply type,
power
3-wire power
supply type,
power

B
2-wire contact
+ (*9)
Dry contact
input -
(*7) (*8)
2-wire,
v
2-wire power
supply type,
signal
3-wire power
supply type +
Connect to
A2EXR001
(*8)
Connect to
A2EXR001

C
2-wire contact
- (*9)
Connect to
A2EXR001
(*8)
2-wire,
voltage -
Connect to
A2EXR001
3-wire power
supply type -
*1:

: 1 to 16
*2: "—" denotes that the terminal is not used. Do not connect any signal because the terminal is connected to internal circuits.
*3: When the power supply is turned off or overcurrent is detected, the current input loop enters a high impedance state.
Do not share the current signal with other receiving devices. If the signals are shared, you must convert the signals into voltage
signals by using an external shunt resistor or shunt resistor module (Part:A1080RZ) to receive the signals.
*4: Power for transmitter is supplied from the A terminal. If an overcurrent is detected, the A terminal enters an open state.
*5: The resistance values of the connecting cables must match.
*6: When the power supply is turned off or overcurrent is detected, the transmitter power supply terminal enters an open state.
*7: Used when the input frequency is 0 to 5 kHz.
*8: Used when the input frequency is 0 to 10 kHz.
*9: Used when the input frequency is 0 to 800 Hz.
Oct. 5, 2018-00