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Allen Bradley - PLC

Flex I/O 1797

The FLEX I/O 1797 product series is from Allen Bradley/Rockwell Automation. The FLEX I/O 1797 series includes a wide variety of modules, including I/O modules, analog modules, input modules, ControlNet modules, and more. The modules within this product series can communicate over EtherNet/IP, ControlNet, and DeviceNet depending on the module. When operating these devices, the temperature of the surrounding environment should range from -20 degrees Celsius to 70 degrees Celsius. Additionally, when storing FLEX I/O 1797 products, the temperature of the surrounding environment should range from -40 degrees Celsius to 85 degrees Celsius. FLEX I/O 1791 devices have several advantages to using them. These advantages include reduced costs, improved diagnostics, customizability, and so much more. These products have compact, modular designs to allow them to be implemented for various applications. Mounting these products can be done in different ways. These methods include mounting FLEX I/O 1797 on a DIN rail mount or a panel mount.

Flex I/O 1797 Selection Guide

The FLEX I/O is a robust, cost-effective distributed I/O platform that offers a high level of functionality in a compact design. Its modular design and dependability have made it popular among users for its cost-effectiveness, versatility, and modularity.

The FLEX I/O system supports various networking technologies, including EtherNet/IP, ControlNet, and DeviceNet. The network adapter and terminal bases are compatible with multiple termination styles. Up to eight terminal commands can be attached to one adapter; this allows for a flexible I/O setup.

The Allen-Bradley Flex I/O 1797 system is a sophisticated, module-based input/output solution for direct placement on control equipment. It can be integrated into various communication networks, including Ethernet/IP, ControlNet, DeviceNet, and Remote I/O.

Specifications

The 1797 Flex I/O system is an I/O solution with various modules, each offering specifications such as power dissipation, I/O type, thermal dissipation, and more. Variants with a higher temperature tolerance are available, featuring a temperature range of -20 to 70°C during operation and -40 to 85°C when stored. The system also has built-in galvanic isolation, eliminating the need for IS barriers or isolators, and sophisticated diagnostic tools for effective problem-solving. Built-in N+1 power redundancy allows for reduced wiring, hardware costs, and downtime while improving system reliability through fault tolerance.

Advantages of 1797 I/O Modules

  1. Reduced Life Cycle Costs: Integrating intrinsically safe I/O reduces the need for standalone barriers, isolators, and specialized enclosures, as well as reducing the length of wiring and cable runs, resulting in estimated savings of around 40%.
  2. Customizable Solutions: FLEX Ex offers a variety of configurations to meet your application needs. It's easy to find the right option for your specific application and get it up and running quickly.
  3. Improved Diagnostics: The LED lights on each channel provide real-time status reports and alerts for wire-off and short-circuiting conditions, as well as the ability to remove or insert under power (RIUP).
  4. Speedy Commissioning: Simplified engineering drawings and documentation make it easier to commission your plant; reduced miswiring means faster commissioning.

Network Choices

Due to its determinism and diagnostic capabilities, the ControlNet network is appropriate for applications in hazardous environments. The ControlNet Ex communication adapter provides a secure and fast control-level network communication that can be linked to up to 8 I/O modules and support a maximum of 128 I/O points.

Using a coax barrier or a fiber hub/repeater to convert coax to fiber can ensure isolation between the ControlNet segments in hazardous and safe regions. For moderate-sized projects, the coax barrier is more cost-effective, while the fiber hub is better suited for larger distances and more extensive applications.

The FLEX Bus Isolator (1797-CEC & -BIC) can be used to connect FLEX and FLEX Ex I/O modules to the same adapter, allowing for connection to FLEX I/O adapters and linking to alternate networks, common in hazardous environments, and using FLEX Ex in low I/O point systems at an affordable price.

Available I/O Options

The 1797 I/O modules provide a range of I/O options to accommodate varied requirements. The 1797-IBN16, a digital module designed for use with NAMUR proximity sensors, push buttons, limit switches, and other primary devices, and the 1797-OB4D, a 4-point source output module suitable for IS solenoid valves and aural alarms, are both examples of digital modules. For capturing signals from pressure and temperature transmitters, flow meters, and other related equipment, the analog module options include the 1797-IE8,  -IE8H, and -IE8NF, 8-point 16-bit single-ended non-isolated input modules, as well as the 1797-OE8, an 8-point 13-bit single-ended non-isolated output module with a discrete mode for low-power indicators. The 1797-IRT8 is an 8-point 16-bit single-ended non-isolated 4-wire RTD, thermocouple, and millivolt input module for connecting to thermocouples, RTDs, potentiometers, and strain gauge bridges. The 1797-IJ2, a two-channel high-resolution frequency input module for precise shaft position information, and the 1797-IJ2 are also specialty modules.

1797-ACNR15 Module

The Allen-Bradley 1797-ACNR15 Flex Ex ControlNet media adapter is designed for use with Flex Ex I/O modules in hazardous environments (requires intrinsic safety). It has two ControlNet ports connecting ControlNet coaxial media cables and supports linear ControlNet media. The 1797-ACNR15 is specifically designed to implement ControlNet Ex redundant networks and can accommodate up to eight Flex Ex I/O modules. It supports a standard communication rate of 5Mbps with built-in indicators for communication, Module, and power statuses. This DIN rail-mounted device has an 8.5 W power consumption. It includes a 24V DC power supply and offers a straightforward communication interface between a scanner port on a programmable controller and Flex Ex I/O modules. The 1797-ACNR15 is IP20 rated with a maximum power dissipation of 8.5 W, has fixed LED indicators, and is certified by CE, UL, c-UL, IECEx, and FM.

1797-BCNR Module

A ControlNet Redundant Barrier Module, the 1797-BCNR, was created for the Allen-Bradley Flex Ex I/O family. It offers real-time error detection and problem resolution. The Module has a built-in ControlNet communication port with a 5 Mbps communication speed and operates at 7V with -7.84 dB transmission attenuation. It is configurable for various applications and can be replaced. In addition, the system's built-in galvanic isolation and compliance with dangerous location laws allow it to operate even in hazardous environments. The Module is protected from corrosion thanks to its FLEX Ex coating and weighs 200 grams.

1797-BIC Module

The 1797-BIC is an Allen-Bradley module that functions as a FLEX Ex Bus Isolator. It is designed to be utilized in hazardous areas and offers a secure connection between typical FLEX I/O modules. Power indications, a detachable power connector, and a master backplane connector are the many characteristics of the Module. It must be synchronously power cycled with the associated adapter for proper operation. The 1797-BIC is built to CE requirements for usage in hazardous environments. The Module enables the connection of both intrinsic and non-intrinsic safety field device wires within the same I/O group. It is connected to the Flex Ex system through the 1794-CE3 cable, with a maximum length of 1 meter. The 1797-BIC must be power cycled every time the communication adapter is power cycled to preserve the inherent safety link.

1797-IBN16 Module

The Allen-Bradley 1797-IBN16 is a hazardous location module approved for Class I, II, and III/Division 1, Zone 1 and 22. It contains 16 NAMUR-compatible and inherently safe non-isolated sinking input channels. Each channel includes a customizable input delay time, yellow status, red fault, and green power indicators. This Module must be attached to a terminal base of the same grade and wired together with 4mm2 stranded wire. It has a complete input pulse width of 500 Ohms and a maximum input frequency of 1000 Hz. It can function at temperatures ranging from -20 to 70°C and be stored at temperatures ranging from -40 to 85°C. The 1797-IBN16 is 46 x 94 x 75 mm and weighs 200 grams.

1797-IE8 Module

The Allen-Bradley 1797-IE8 Flex Ex analog input module boasts intrinsic safety ratings of Class I, II, III Division 1 Groups A-G and A-D. It is equipped with 8 non-isolated channels, each offering 16-bit resolution, and is capable of accepting both 0-20 mA and 4-20 mA signals. The Module has a digital format with a precision of 0.1% at 20°C. Its update rate ranges from 200 ms to 1600 µs, and it features internal diagnostics for alarm detection. The Module must be connected to a compatible terminal base like 1797-TB3 or 1797-TB3S using 4mm2 stranded copper wire with 1.2mm insulation. The Module's critical switch assignment is at position 3.

1797-IE8NF Module

The 1797-IE8NF, an analog input module, has eight channels and is equipped with an integrated noise filter, suitable for accepting either 0-20 mA or 4-20 mA signals. It is certified for use in Class I Division 1 & 2 hazardous zones across North America and Europe and can be utilized to connect with field equipment in hazardous environments of Class I, II, and III. The Module has a 16-bit resolution, 0.1% accuracy at 20°C, and dissipates 5.2 W of power. It has fault detection, eight red fault lights, and one green power indicator. A precise current source, meter, industrial termination, and cable may be required for calibration.

1797-IJ2 Module

The 1797-IJ2 from Allen-Bradley is a two-frequency input module that facilitates radio communication between two devices. It features two frequency channels:

  • Two gate channels
  • A thermal dissipation rate of 14.5 BTU/h.

This module has an IP20 protection rating. The 1797-IJ2 can operate on a relative humidity range of 5 to 95%. Three status indicators (A, B, and C) are present to display individual channel status, individual I/O designations, and power status.

1797-IRT8 Module

The 1797-IRT8 by Allen-Bradley is a thermocouple input module designed for indoor use in a factory environment. It boasts 8 channels for input, with a signal range of 0 to 485 ohms and -40 to 100 MV. The Module requires less than 9.5 Volts DC for power supply voltage and current consumption of less than 1 Amp. It features an IP20 enclosure, which is not water-resistant and must be protected from water exposure. The 1797-IRT8 drive offers both DIN rail and panel mounting options, with dimensions of 3.7 inches, 2.95 inches in width, and 1.8 inches in height.

The 1797-IE8NF input module operates under non-condensing relative humidity conditions ranging from 5 to 95%. This module reaches 99% of its full potential within a mere 8 milliseconds and features 8 red fault lights and a single green indicator that displays module power status. The 1797-IRT8 drive is configurable for various sensors and is certified by C/US, UL, C-Tick, and marine-GL. It has a lead resistance compensation of less than 15 Watts and a total power dissipation rating of 1.6 Watts.

1797-OB4D Module

The 1797-OB4D is a non-isolated output module from the 1797 series of analog modules manufactured by Allen-Bradley. The Module has 4 output channels that reference a single supply and a yellow LED that indicates the output status. Each channel updates every 2 milliseconds from the backplane. The Module has the following features:

  • A voltage of 25 Volts DC
  • A thermal dissipation of 17.07 BTU per hour
  • A power consumption of 7.5 Watts at 9 Volts
  • A power dissipation of 5 Watts.

In case of a fault, the 1797-OB4D output module has a fault indication function, and the status indicator will blink red. It can detect short circuits, wire off per channel, and is electronically protected against short circuits. Faults can be reported directly to the controller by the Module. The module dimensions are approximately 46 millimeters x 94 millimeters x 75 millimeters (width x height x length).

1797-OE8 Module

The Allen-Bradley Flex Ex 1797-OE8 is a top-of-the-line analog output module with 8 non-isolated, single-ended channels. The device is designed for safety with a NEMA-certified IP20 enclosure, and it requires 12 AWG stranded cables for power connections. The 1797-OE8 includes eight red fault indications, one green power indicator, and four key switch locations. It requires a voltage of over 11 Volts at 22 MA and has a current range of 0 to 22 MA. The gadget creates 2G vibrations at 10 to 500 Hertz and has a reaction time between the Module and adapter of 200 to 1600 microseconds. The 1797-OE8 is 3.7 x 2.95 x 1.8 inches and includes panel-type mounting and DIN rails.

1797-OE8H Module

The 1797-OE8H output module from Allen-Bradley/Rockwell Automation's Flex Ex I/O line. It may be attached on a DIN rail; grounding is feasible if the DIN rail is zinc-plated yellow chromate steel. It has 8 single-ended, non-isolated outputs. Although the Module supports RIUP (Removal and Insertion Under Power), it is suggested that the power supply be disconnected before removing the Module.

The Allen-Bradley 1797-OE8H is an output module with:

  • A current capacity of 0-22 mA
  • A voltage range of 15 V at 22 mA
  • A power consumption of 6.1 Watts
  • A heat dissipation rate of 5.4 Watts.

This module weighs approximately 200 grams and can operate in temperatures ranging from -4 to 158 degrees Fahrenheit.

1797-PS1E Module

The Allen-Bradley 1797-PS1E is a Flex-Ex system quad-Ex DC output power supply module. It includes:

  • An input voltage range of 85-253 VAC
  • An input frequency range of 47-63 Hz
  • The four separate output channels (each of 8.5 Watts of power).

The Module is built for usage in hazardous situations, with a flame-proof housing, explosion-proof terminations, and sealed wire entry/exit ports for added security. Each output channel is Intrinsically Safe and separately IS restricted, making it appropriate for usage in hazardous regions with acceptable ambient temperatures ranging from -20 to 70°C in Zone 1 and category 3D in Zone 22 according to Directive 94/9 EC. Power supply lines must be built for usage in high ambient temperatures.

Browse our selection of Flex I/O 1797 units

AutomationStop.com's online catalog offers one of the largest selections of preowned Flex I/O 1797 units in the world.

1797-ACNR15

The Allen-Bradley 1797-ACNR15 is a media adapter module from the Bulletin 1797 Flex Ex and ControlNet Ex line. This media adapter device connects Flex Ex series modules to the ControlNet Ex network. The 1797-ACNR15 media adapter should be wired with copper wire. Additionally, the adapter can consume up to 8.5 W of power and dissipate up to 8.5 W of power. The device can be stored at -40 to 85 degrees Celsius and used at -20 to 70 degrees Celsius.

1797-BCNR

Designed by Allen Bradley, part number 1797-BCNR is a FLEX Ex redundant ControlNet barrier module. This module does not require a power supply to operate. The transmission rate of this product is 5 megabits per second. The dimensions of the 1797-BCNR measure 10 cm x 9 cm x 7 cm (W x D x H).

1797-BIC

Catalog number 1797-BIC is a FLEX Ex bus isolator module. It was manufactured by Allen-Bradley. This device has an I/O module capacity of eight (8) FLEX Ex modules. At 0.15 amperes, this product consumes 18 to 32 volts DC. The 1797-BIC has a 2.1-watt rated power dissipation, as well as a 7.2 BTU/hr rated thermal dissipation.

1797-IBN16

The Allen-Bradley 1797-IBN16 is an input module with 16 non-isolated sinking input channels. It is a member of the Bulletin 1797 line of Allen-Bradley Flex Ex devices. Every input on the 1797-IBN16 module can support a NAMUR sensor or a mechanical contact. Its power dissipation rating and its field-side power consumption rating are both 2.8 Watts. The 1797-IBN16 input module can tolerate 5 to 95% relative humidity in a clean environment that does not experience condensation.

1797-IE8

The 1797-IE8 is an analog type of input module from the Allen-Bradley/Rockwell Automation Bulletin 1797 line of Flex Ex I/O modules. It has 1 green power indicator, 8 red fault indicators, and 8 non-isolated inputs. Each input has its own fault indicator. The unit's maximum power dissipation rating is 5.2 W while its field side power consumption rating is 7.5 W. The 1797-IE8 input module weighs about 200 grams and its resolution is 16 bits.

1797-IE8NF

The 1797-IE8NF analog module is an Allen-Bradley Bulletin 1797 Flex Ex input module. It supports 8 non-isolated inputs, and comes with a noise filter. In addition, its inputs can be easily configured for current signals rated at 0-20 mA or at 4-20 mA. The 1797-IE8NF module is designed to be resistant to explosions. Additionally, it can be used in intrinsically safe systems, and its heat dissipation rating is 17.75 BTU per hour, while its power dissipation rating is 5.2W.

1797-IRT8

The 1797-IRT8 module is a thermocouple or RTD I/O module from the Allen-Bradley Bulletin 1797 series. The 1797-IRT8 thermocouple I/O module has 8 inputs and they are labelled with numbers from 0 to 7. These inputs are all thermocouple inputs. The 1797-IRT8 module can be mounted with a keyswtich on a compatible terminal base. Each input has a red indicator light that illuminates when the corresponding input experiences a fault, and the 1797-IRT8 module also has a green power indicator light.

1797-OB4D

The 1797-OB4D module is a source output module from Allen-Bradley. This output module comes from the Bulletin 1797 Flex Ex I/O series. The 1797-OB4D module is a non-isolated type of output module with 4 output channels that can each operate a digital type of field device. The module's power supply needs to be an intrinsically safe type of power supply. The 1797-OB4D output module's field-side power consumption rating is 7.5W and its power dissipation rating is 5W. The module dissipates heat at a rate of 17.07 BTU per hour.

1797-OE8

Catalog number 1797-OE8 is a FLEX Ex I/O module from Allen Bradley. This module features eight (8) single-ended, non-isolated outputs. It has a 13-bit resolution. This product requires a 9.5-volt DC power supply to operate. The power dissipation rating of the 1797-OE8 is 5.4 watts and the thermal dissipation rating is 18.4 BTU/hr. Furthermore, this module has a field-side power consumption rating of 6.3 watts.

1797-OE8H

The 1797-OE8H module is a FLEX Ex HART I/O module designed and assembled by Allen Bradley/Rockwell Automation in the Bulletin 1797 product line. The 1797-OE8H module supports up to 8 analog outputs. These 8 outputs are not isolated and these outputs can all operate with 0 to 20 mA by default or they can be configured to operate with 4 to 20 mA. The 1797-OE8H module's key features include alarms for overrange and underrange errors, support for full functionality even without jumpers and switches, and support for advanced features through local microprocessor-based intelligence.

1797-PS1E

The 1797-PS1E module is a power supply unit from Allen-Bradley. It is manufactured in the Bulletin 1797 series of Allen-Bradley Flex Ex 85 devices. The 1797-PS1E power supply has 4 output points and each output is rated at 8.5W. The device has an AC input voltage rating of 85 to 253 Volts AC and its current consumption rating is 0.9 Amperes. The maximum thermal dissipation rating of the 1797-PS1E module is 71.67 BTU per hour, while its maximum power dissipation rating is 21 Watts.

1797-PS2E2

The 1797-PS2E2 module is a power supply module from the Allen-Bradley Bulletin 1797 Flex Ex module series. The unit is also known as a Flex Ex power supply. Its power dissipation rating is 21 W and it operates on 18-32V DC. Its current consumption rating is 3.1 to 1.6 A. It is designed for use in intrinsically safe systems. The 1797-PS2E2 power supply is built with an IP65-rated enclosure which is flameproof.

1797-PS2N2

The 1797-PS2N2 is a Flex Ex power supply module from the Allen-Bradley Bulletin 1797 line.Each of the module's 4 channels can produce 8.5 W of output power. Additionally, it features dual power feeds that support redundancy for the source input. The outputs of the 1797-PS2N2 module are all IS galvanically isolated. This power supply module operates at 19 to 32 Volts DC and consumes 3.1 Amps of current.

1797-RPA

The 1797-RPA is a ControlNet Ex type of ControlNet network-compatible Allen-Bradley repeater adapter module from the Bulletin 1797 product line. It is also a fiber repeater type of module. The 1797-RPA module supports intrinsically safe signals and DIN rail mounting. Its I/O capacity is 2 fiber modules. The power consumption and power dissipation ratings of the 1797-RPA module are both 8.5 Watts. The 1797-RPA module's communication rate is 5 Mbps.

1797-RPFM

Product number 1797-RPFM is a fiber repeater module. It was designed by Allen Bradley/Rockwell Automation. This unit has a communication rate of 5 megabits per second. The 1797-RPFM consumes 8.5 watts of power, and it has a thermal dissipation rating of 29 BTU/hr. The approximate weight of this product is 100 grams. Furthermore, the dimensions of this module measure 94 mm x 94 mm x 91 mm.

1797-PS2N

The 1797-PS2N module is an Allen-Bradley Flex Ex type of power supply module from the Bulletin 1797 series. It is made for applications in Flex Ex systems. It has 4 channels that operate with 8.5 W of output power per channel. The device operates at 19-32V DC of voltage and 3.1 Amps of output current. The 1797-PS2N module also dissipates 21 Watts of power, and it dissipates 71.67 BTU of heat per hour.

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