1797-TB3 Allen-Bradley Rockwell FLEX Ex I/O Terminal Base

Product parameters

General parameters

Module type: Flex Ex Intrinsically safe Terminal Base Unit

Product Number: 1797-TB3 (Series A)

Terminal quantity: 52 terminals (16 I/O terminals in 1 row, 18 common/voltage terminals in each of 2 rows)

Wiring method: Screw-Clamp

Current capacity: Maximum 10 A

Voltage range: Up to 125V AC/DC, 50/60 Hz

Flexbus current: 640 mA @ 5V DC

Isolation voltage: 125V (continuous). The Insulation Type between the terminal and the Flexbus is Basic Insulation Type. The isolation between channels is determined by the inserted module

Terminal screw torque: 0.8 to 1 N-m (7 to 9 lb-in)

Supporting wire: 0.21 x 1.3mm ² (24-16 AWG) stranded copper wire, maximum insulation thickness 1.2mm

Installation method: DIN rail or panel installation (optional installation kit required)

Protection grade: IP20 (For indoor use, dustproof and waterproof required)

Operating temperature: -20°C to 70°C (-4°F to 158°F)

Storage temperature: -40°C to 85°C

Relative humidity: 5% to 95% (non-condensing)

Seismic resistance: 15 g (peak at 11 ms, IEC 68-2-27)

Vibration resistance: 2 g (10-500 Hz, IEC 68-2-6)

Certification:

North America: Class I Division 1 & 2, Groups A-D; Class I Zone 1 & 2, Groups IIC, IIB, IIA

Europe: IECEx, CENELEC (in compliance with EN 50020), applicable to Zone 0, 1, 2, 21, 22

Others: UL, C-UL, FM, INMETRO, CE

Physical and electrical characteristics

Terminal configuration: Supports 36 bidirectional wiring connections, including label covers for backplane bus connections

Non-site repairable: The module cannot be disassembled and repaired on site. It needs to be returned to the factory for processing to maintain the intrinsic safety certification

Supported modules: Compatible with Flex Ex I/O modules (such as 1797-IB16, 1797-OB4D, etc.)

Function

Intrinsically safe wiring support

Provide the connection points of the intrinsically safe I/O module, which comply with the safety standards of hazardous areas (such as EN 50020, DIN EN 60079-11).

Supports up to 36 wiring connections for input/output signals, common terminals and power terminals.

Modular design

As the terminal base of the Flex Ex I/O system, it carries intrinsically safe I/O modules (such as digital and analog modules) and is used in conjunction with isolation modules such as 1797-BIC.

Supports DIN rail or panel installation, simplifying system integration.

Compatibility

Support protocols such as ControlNet, DeviceNet, EtherNet/IP, etc. through Flex Ex adapters (such as 1797-ACNR15 ControlNet adapter).

Compatible with controllers such as FlexLogix and ControlLogix.

Security features:

Only intrinsically safe signals are supported, and non-intrinsically safe signals are not allowed to be connected to protect the integrity of the system in the hazardous area.

Provide basic insulation from the terminal to the Flexbus to prevent electrical interference.

Installation and maintenance

The screw clamping design is convenient for wiring, but it requires more installation time compared to the Spring-Clamp.

Equipped with a locking mechanism, it meets the requirements of shock resistance and vibration resistance (DIN rail lock is required).

Application scenarios

Petrochemical and oil and gas industry: Used in Class I Zone 0, 1, 2 or European Zone 0, 1, 2, 21, 22 hazardous areas, connecting intrinsically safe sensors, actuators to control systems.

Chemical engineering and pharmaceuticals: In explosive gas or dust environments (such as chemical plants and pharmaceutical factories), provide wiring support for intrinsically safe I/O modules and monitor signals such as temperature and liquid level.

Distributed control system: In large factories, it serves as the terminal base for remote intrinsically safe I/O and communicates with the central controller through adapters.

Hybrid I/O system: Used in conjunction with 1797-BIC, it supports the hybrid configuration of standard Flex I/O and Flex Ex modules, optimizing the system integration between hazardous and non-hazardous areas.

Automation of hazardous environments: Applicable to scenarios requiring high safety certification, such as dust environments (Class II/III) or explosive gas environments, to ensure the safe operation of equipment.

Advantage Products:

All items are Distributor Ready-stock Genuine Brand-new Supplying, please inform us if the other conditions are needed, Used, Open-box, Refurbished, etc.

Many Available just wait for you, feel free to ask to get better deal!!!

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