National Instruments CFP-CB-3 User Manual
FIELDPOINT™ OPERATING INSTRUCTIONS
AND SPECIFICATIONS
cFP-CB-1/2/3/4
Compact FieldPoint Connector Blocks
These operating instructions describe how to install and use the
cFP-CB-1, cFP-CB-2, cFP-CB-3, and cFP-CB-4 (referred to
inclusively in this manual as the cFP-CB-x).
Features
The cFP-CB-x Compact FieldPoint connector blocks have the
following features:
• Designed for general-purpose and hazardous-voltage
operation with all Compact FieldPoint I/O modules (cFP-CB-1
and cFP-CB-2)
• Isothermal construction minimizes temperature gradients for
use with thermocouples (cFP-CB-3)
• Mounting on a cFP-BP-x or cFP-180x Compact FieldPoint
backplane
• Up to 36 terminals
• Tie-wrap anchors for wires (cFP-CB-1 and cFP-CB-3)
• Front-panel access to terminals (cFP-CB-2 and cFP-CB-4)
• Removable front-mounted connectors (cFP-CB-2 and
cFP-CB-4)
• Spring terminals or screw terminals available
• V and C terminals for voltage supply and common connections
• –40 to 70 °C operation
6
5
C
C
4
3
2
1
1 Tie-Wrap Anchors
2 Screw Hole for Strain-Relief Bar
3 Screw Terminals
4 Screw Hole for Top Cover
5 Mounting Screw
6 37-Pin I/O Connector
Figure 1. cFP-CB-1 Parts Locator Diagram
Earlier cFP-CB-1 connector blocks have a different
Note
screw-terminal numbering arrangement.
76
5
4
3
2
1
1 36-Pin Spring-Terminal Block 2 Mounting Screw
Figure 2. cFP-CB-2 Parts Locator Diagram
cFP-TC-120
C
C
+ –
+ –
+ –
+
–
+ –
+ –
CH 0
–+
CH 1
CH 2
CH 3
CH 4
+ –
CH 5
TERMINAL
CH 6
CH 7
ASSIGNMENTS
cFP-CB-1/2/3/4 2 ni.com
76
5
C
C
4
+ –
3
cFP-TC-120
+ –
CH 0
CH 1
2
1
1 Tie-Wrap Anchors
2 Screw Hole for Strain-Relief Bar
3 Overlay Showing Channel
Assignments of Screw Terminals
Figure 3. cFP-CB-3 Parts Locator Diagram
5
4
3
cFP-TC-120
C
C
+ –
+ –
CH 0
CH 1
+ –
+
–
+ –
+ –
–+
CH 2
CH 3
CH 4
+ –
CH 5
TERMINAL
CH 6
CH 7
ASSIGNMENTS
4 Screw Hole for Top Cover
5 Mounting Screw
6 Screw Terminals
7 37-Pin I/O Connector
76
+ –
+
–
+ –
+ –
–+
CH 2
CH 3
CH 4
+ –
CH 5
TERMINAL
CH 6
CH 7
ASSIGNMENTS
2
1
1 20-Pin Screw-Terminal Block 2 Mounting Screw
Figure 4. cFP-CB-4 Parts Locator Diagram
© National Instruments Corp. 3 cFP-CB-1/2/3/4
Wiring to the Connector Block
Refer to the I/O module operating instructions for information
about wiring configurations, including detailed wiring diagrams
and fuse recommendations.
Note To protect the FieldPoint system and connected
devices, install appropriate external fuses on all
terminals. Refer to the Specifications section for the
current limits of the cFP-CB-x terminals.
Note The V terminals are internally connected to each
other and the C terminals are internally connected to each
other.
Caution Ensure that hazardous voltage wiring is
performed only by qualified personnel adhering to local
electrical standards.
Wirng to the cFP-CB-1 and cFP-CB-3
1. Loosen the top cover screws and remove the cover. Refer to
Figure 5.
Figure 5. Removing the Top Cover from the cFP-CB-x
cFP-CB-1/2/3/4 4 ni.com
2. Verify that there are no cuts in the wire insulation that can
cause a safety hazard.
3. Strip 6 mm (0.24 in.) of insulation from the ends of the wires.
4. Insert the entire stripped ends of the wires into the appropriate
screw terminals. Do not allow any bare wire to show outside
the screw terminals.
5. Using a 1/8 in. flathead screwdriver, tighten the screw
terminals to 0.5–0.6 N ⋅ m (4.4–5.3 lb ⋅ in.) of torque.
Wiring to the cFP-CB-2
You need a flathead screwdriver with a blade smaller than
2.3 × 1.0 mm (0.09 × 0.04 in.) to connect wires to the detachable
spring-terminal connector. Complete the following steps:
1. Verify that there are no cuts in the wire insulation that can
cause a safety hazard.
2. Strip 7 mm (0.28 in.) of insulation from the ends of the wires.
3. Insert the screwdriver into a spring clamp activation slot.
4. Insert the entire stripped end of the wire into the corresponding
spring terminal. Do not allow any bare wire to show outside the
terminal.
5. Remove the screwdriver to clamp the wire into the terminal.
Figure 6.
Connecting a Wire to the Spring-Terminal Connector of the cFP-CB-2
6. When the wiring is complete, insert the connector into the
cFP-CB-2.
© National Instruments Corp. 5 cFP-CB-1/2/3/4
Note If your application is subject to high vibration,
National Instruments recommends installing the NI 9940
backshell on the spring-terminal connector. You can
order the NI 9940 from
Caution If your application is subject to hazardous
ni.com.
voltage, you must install the NI 9940 backshell on the
spring-terminal connector.
Figures 7, 8, and 9 show how to install the NI 9940 connector
backshell on the cFP-CB-2.
Figure 7. NI 9940 Connector Backshell and cFP-CB-2
Figure 8. Closing the NI 9940 Connector Backshell
cFP-CB-1/2/3/4 6 ni.com
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