Allen-Bradley 1797-TB3 FLEX Ex Terminal Base Units

Description

The 1797-TB3 terminal bases have 36 wiring connections to and from a plug-in module. The use of each terminal depends on the module mounted in the base.

Both terminal bases are equipped with a factory-installed tab cover for the backplane bus connection. The tab cover may be removed only when the terminal base is connected to other terminal bases.

Component Identification

1. Female Flexbus Connector

2. Terminal Base Unit

3. Male Flexbus Connector

4. Keyswitch

Set to the position required for the installed module.

5. Mounting Holes

For panel mounting.

6, 7, 8. Input/Output Terminal Strips

Used for connecting input/output wiring, -V, and +V connections.

9. Locking Tab

10. Module Locking Latch

11. Cover Plug for Male Flexbus Connector

12. 96-Pin Female I/O Connector

Specifications – 1797-TB3 and 1797-TB3S Terminal Base Units

Number of Terminals

1 row of 16, 2 rows of 18.

1797-TB3 Terminal Screw Torque

0.8…1.0 Nm (7…9 lb-in).

1797-TB3S Terminal Type

Spring-clamp.
- To open, insert a bladed screwdriver (2.54-3.05 mm/0.100-0.120 in.) and lift up.

Terminals Assignments

Specific Terminals

+34, -35, +50, -51, and 96

Female I/O Connector Pins

30…32, 62…64, 94…96, 36, 49

All Other Terminals

Only for intrinsically safe circuits.
- Ui <10V dc
- Ii <2.5 A
- Ci <1 nF
- Li Negligible

Must Not Be Used for Any Connection

Ui <30V dc
Ii <100 mA
Ci <1 nF
Li Negligible

Flexbus Connection

Intrinsically Safe:
- Ui <10V dc
- Ii <400 mA
- Ci <1 nF
- Li Negligible

Isolation Voltage

Channel-to-channel isolation is determined by the inserted module.

Physical Specifications

Weight

Approximately 200 g.

Dimensions (With Module Installed in Base)

Metric: 3.7H x 3.7W x 2.7D mm.
Imperial: 94H x 94W x 69D in.

Environmental Conditions

Operational Temperature

-20…70°C (-4…158°F).

Storage Temperature

-40…85°C (-40…185°F).

Relative Humidity

5…95% noncondensing.

Shock

Operating Tested: 15 g peak acceleration, 11 (±1) ms pulse width.
Nonoperating Tested: 15 g peak acceleration, 11 (±1) ms pulse width.

Vibration

Tested: 2 g @ 10…500 Hz per IEC 68-2-6.

Conductors

Wire Size

4 mm² (12 gauge) stranded max.

Insulation

1.2 mm (3/64 in.) insulation max.

Agency Certification

IECEx

Ex ia IIC T4 Gb

CENELEC

II 2G Ex ia IIC Gb T4

UL, C-UL

Class I, Groups A, B, C, and D; Class II, Groups E, F, and G; Class III Hazardous Locations.
Class I, Zone 1, AEx ib[ia] IIC T4.

FM

Intrinsically Safe Class I, Div 1, Groups A, B, C, D, T4.
Associated Apparatus with intrinsically safe Connection Class I, II, III, Div 1, Groups A–G.
Intrinsically Safe Class I, Zone 1, AEx ib[ia] IIC T4.

INMETRO

BR-Ex ia IIC T4

Certificates

IECEx BVS 08.0006X
CENELEC DMT 98 ATEX E012 U
UL, C-UL UL File Number E197983
FM Certificate Number 3009806
INMETRO 05/UL-BRAE-0019U

Note: Termination connections are unique with each I/O module. Refer to the appropriate I/O module’s installation instructions.

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