AB 1794-IB8 FLEX I/O Digital Input Modules

AB 1794-IB8 FLEX I/O Digital Input Modules

IMPORTANT USER INFORMATION: Solid-state equipment has different characteristics than electromechanical equipment and should be used in accordance with applicable safety guidelines. Rockwell Automation is not responsible for consequential damages arising from the use of the equipment, and the manual examples are for reference only and may not be reproduced without permission. Includes a variety of safety tips, such as operating in hazardous environments, risk of electric shock and burns, and more.

Installation requirements: For use in industrial environments of pollution class 2, overvoltage category II, at altitudes up to 2000 metres above sea level, as Group 1, Class A industrial equipment. Installation in a specific enclosure that is flame retardant and accessible only by means of tools, with attention to electromagnetic compatibility.

Approval for use in hazardous areas

Europe: 1794 - IB8, 1794 - IB16 are approved for use in Zone 2 in Europe with additional requirements such as UV protection, enclosure protection level, avoidance of voltage overruns, etc.

North America: 1794 - IB8, 1794 - IB16, 1794 - IB32 approved for use in North American hazardous areas. Products are labelled with a temperature code, and when combining devices, attention should be paid to the overall temperature code and local regulatory review.

Installation Procedure

Installation to Terminal Block: Rotate key switch to ensure Flexbus connector is fully extended, align module with terminal block recesses, insert and securely install, taking care to prevent debris from falling into the module and possible hazards associated with energised plugs and unplugs.

Wiring: Use 1794-TB3 or 1794-TB3S terminal blocks for 1794-IB8 and 1794-IB16, and 1794-TB32 or 1794-TB32S terminal blocks for 1794-IB32 to connect the input wires, power wires, and common wires according to the corresponding wiring diagrams, respectively, and to daisy-chain the power supply.

Configure Input Module: Configure the input module by setting the bits in the configuration word, mainly to set the input filter time. The input filtering time setting range is different for different modules, such as 0 - 7 for 1794 - IB8, 0 - 11 for 1794 - IB16 (12 - 15 for some of them), and 0 - 31 for 1794 - IB32, which corresponds to different bit settings.

Input Characteristics

| Module Model | 1794 - IB8|1794 - IB16|1794 - IB32|

| Number of Inputs | 8-way | IB8 | 1794 - IB16 | 1794 - IB32 | 1794 - IB32

| Number of Inputs | 8 | 16 | 32 |

| Input Type | Current, Pour Current | Current, Pour Current | Current, Pour Current | Current, Pour Current | Current, Pour Current

| Recommended Terminal Blocks | 1794 - TB3, 1794 - TB3S, 1794 - TB3K, 1794 - TB3SK, 1794 - TBKD, 1794 - TB37DS|1794 - TB3, 1794 - TB3S, 1794 - TB3K, 1794 - TB3SK, 1794 - TBKD, 1794 - TB37DS |1794 - tb32, 1794 - tb32s, 1794 - tb62ds, 1794 - tb62exd4x15|, 1794 - tb62exd4x15

|On-state voltage (V DC)| Minimum 10, Nominal 24, Maximum 31.2 | Minimum 10, Nominal 24, Maximum 31.2 | Minimum 19.2, Nominal 24, Maximum 31.2 | On-state current (mc)

| On-state current (mA)| 2.0 minimum, 8.0 nominal, 12.0 maximum | 2.0 minimum, 8.0 nominal, 12.0 maximum | 2.0 minimum, 4.1 nominal (at 24V DC), 6.0 maximum | Off-state voltage (VDC) | 10 minimum, 24 nominal, 31.2 maximum | 19.2 minimum, 24 nominal, 31.2 maximum

| Off-state voltage (V DC)| 5.0 max.

| Off-state current (mA)| 1.5 max.

| Nominal Input Impedance (kΩ)|4.6|4.6|22.2

Electrical Performance Parameters

Isolation Voltage: All 50V (continuous), basic insulation type, but with different test conditions. 1794 - IB8 tested at 850V DC for 60s, 1794 - IB16 tested at 707V DC for 60s, and 1794 - IB32 tested at 2121V DC for 2s with no isolation between individual channels of each module.

FlexBus Current: 20mA @ 5V DC for the 1794 - IB8 and 30mA @ 5V DC for both the 1794 - IB16 and 1794 - IB32 is used to power the module's FlexBus interfaces and to ensure that power is available for communication with other devices.

Power Consumption and Thermal Dissipation: 1794 - IB8 consumes 3.5W @ 31.2V DC with a maximum thermal dissipation of 11.9BTU/hr @ 31.2V DC; 1794 - IB16 consumes 6.1W @ 31.2V DC with a maximum thermal dissipation of 20.8BTU/hr @ 31.2V DC; 1794 - IB32 consumes 6.0W @ 31.2V DC with a maximum thermal dissipation of 20.0V DC; 1794 - IB32 consumes 6.0W @ 31.2V DC with a maximum thermal dissipation of 20.8BTU/hr. DC, maximum thermal dissipation 20.47BTU/hr @ 31.2V DC , reflecting the module's energy consumption and heat dissipation during operation.

Physical specification parameters: the document does not explicitly mention the module size, weight and other specific physical dimensions of the parameters, but mentioned that the type of enclosure is none (open), the protection performance is dependent on the installation of the shell to achieve, and gives the conductor category of the signal port 2, used to guide the wiring planning.

Environmental suitability parameters

Temperature range: - 20...55°C (-4...131°C) for the 1794-IB8 and 1794-IB16, 0...55°C (32...131°F) for the 1794-IB32; storage temperature are - 40...85°C (-40...185°F), reflecting the range of operating and storage temperatures tolerated by the different modules.