YOKOGAWA CENTUM CS, Technical Information

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3. Cabling
3-73
TI 33J01J10-01EN
n
Fieldbus Wiring for ALF111 with Pressure Clamp Terminal Block
The signal cables from the field device should be connected to the + and - terminals of the
pressure clamp terminal block (ATF9S).
Do not connect anything to the terminals of channels that are not used.
When installing the node unit mounted with the ALF111 on the 19-inch rack, connect the shield
lines of Fieldbus cables from the field devices to the Functional grounding terminal of the ATF9S.
If two or more channels are used, no more than two shield lines can be connected to one
Functional grounding terminal.
When installing the node unit mounted with the ALF111 in the control station cabinet, connect
the shield lines of Fieldbus cables to the shield ground bar within the cabinet (insulated from the
cabinet itself), not to the Functional grounding terminal of the ATF9S.
The length of the connection cable between the power supply unit and the ALF111 should be less
than one meter. Use a type A cable and connect the cable shield to the same potential as the
Functional grounding terminal of the node if the cable length exceeds one meter.
Note that, when installing wiring within the cabinet, the shield line should be connected to the
shield ground bar within the cabinet as well. For details about example of wiring, see section
3.7.11.
+
CH1
CH2
CH3
CH4
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
ALF111
RCV
SND
+
CH1
CH2
-
+
-
+
-
+
-
ALF111
ALF111
F030614.ai
RCV
SND
STATUS ACT DX
1 2 3 4
1
2
3 4
Secondary power supply bus unit AEP9D
Shield cable
To FF devices
Fieldbus power supply MTL5995
(purchased separately)
24 V DC input (from PW60

)
Use the following fieldbus cables:
*1: It is recommended to use Type A cable.
Cable type
Type A (*1)
Type B
Type D
Total wire length
1900 m
1200 m
200 m
To Fieldbus power supply
Magnified
FF-H1
Functional grounding terminal
(Max. two shield lines can be
connected together.)
FF-H1 cable
Figure Fieldbus Wiring for ALF111 with Pressure Clamp Terminal
Oct. 5, 2018-00