AB 1794-IB8, -IB16, -IB16K, and -IB32 FLEX I/O Digital Input Modules

AB 1794-IB8, -IB16, -IB16K, and -IB32 FLEX I/O Digital Input Modules

Safety and Use Precautions

Follow Safety Guidelines: Solid-state equipment has different operating characteristics than electromechanical equipment and should be used in accordance with the Safety Guide for the Application, Installation, and Maintenance of Solid-State Controls, Publication SGI-1.1, to ensure proper application of the equipment. Rockwell Automation is not responsible for consequential damages resulting from the use of the equipment. Manual examples are for reference only and may not be reproduced without permission.

Environmental and Installation Requirements: For use in industrial environments up to 2000 metres above sea level in Pollution Class 2, Overvoltage Category II, Group 1, Class A industrial equipment. To be installed in a suitable enclosure, which should be flame retardant and internally accessible only by means of tools. Use zinc-plated yellow chrome steel DIN rails for grounding, avoid corrosive, oxidised or electrically non-conductive rail materials, fix the rails at 200mm intervals and use end anchors.

Electrostatic protection: The equipment is sensitive to static electricity. When operating, touch an earthed object to discharge static electricity, wear an earthed wrist strap, avoid touching connectors and circuitry assemblies, use an electrostatic safe workstation if available, and store the equipment in suitable electrostatic safe packaging when not in use.

Hazardous area use: There are specific approvals and requirements for use in Zone 2 in Europe and hazardous areas in North America, such as the need to install the equipment in an enclosure with at least IP54 protection for use in Europe, labelling of the product with a temperature code for use in North America, and consideration of the overall temperature code when combining the equipment and reviewing it with the local regulatory agency. Also, when operating in hazardous areas, it is strictly prohibited to disconnect equipment or connections while energised to prevent the risk of explosion.

Electrical Safety: To comply with the CE Low Voltage Directive (LVD), the equipment must be powered from a source that complies with Safety Extra Low Voltage (SELV) or Protection Extra Low Voltage (PELV).

Module Installation

Mounting to Terminal Block: Mount the module to the 1794 series terminal block, turn the key switch to position 2 before mounting to ensure that the Flexbus connector is fully extended, take care when inserting the module that it is aligned with the grooves and securely mounted to prevent debris from falling into the module, as an electrically charged insertion or removal could result in an explosion.

Wiring: 1794 - IB8, 1794 - IB16, and 1794 - IB16K are wired using 1794 - TB3 or 1794 - TB3S terminal blocks; 1794 - IB32 is wired using 1794 - TB32 or 1794 - TB32S terminal blocks. Connect the input, power and common wires according to the corresponding wiring table to daisy-chain the power supply.

Module Configuration: Configure the input module by setting the bits in the configuration word, mainly to set the input filter time. The setting range of input filter time 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 filtering lengths, and can be adjusted according to the actual demand.

Specification

Input Characteristics

| Module Model | 1794 - IB8|1794 - IB16|1794 - IB16K|1794 - IB32

| - - - - - - - - - - - - - - - - - - -

| Number of inputs | 8 | 16 | 32 |

| Input Type | Non-Isolated, Current-Flooded | Non-Isolated, Current-Flooded | Non-Isolated, Non-Isolated in Group, Current-Flooded |

| Recommended Terminal Block | 1794 - TB3, 1794 - TB3S|1794 - TB3, 1794 - TB3S|1794 - TB32, 1794 - TB32S|

| 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 (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.

| Input impedance (kΩ)|4.6|4.6|6.0|

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 and 1794 - IB16K 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, 30mA @ 5V DC for the 1794-IB16 and 1794-IB16K, and 25mA @ 5V DC for the 1794-IB32, which 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 3.5W @ 31.2V DC and 11.9BTU/hr @ 31.2V DC; 1794 - IB16 and 1794 - IB16K 6.1W @ 31.2V DC and 20.8BTU/hr @ 31.2V DC; 1794 - IB32 6.0W @ 31.2V DC; 1794 - IB32 6.0W @ 31.2V DC. 6.0W @ 31.2V DC, maximum thermal dissipation 20.5BTU/hr @ 31.2V DC, reflecting the module's energy consumption and heat dissipation during operation.

Physical Characteristics

Dimensions: The mounted dimensions are 94 x 94 x 69mm (3.7 x 3.7 x 2.7in.), allowing for easy installation in control cabinets and other equipment.

Indicators: The 1794-IB8 has 8 yellow status indicators, the 1794-IB16 and 1794-IB16K have 16 yellow status indicators, and the 1794-IB32 has 32 yellow status indicators to indicate the status of the input devices, allowing the user to monitor module operation.

Terminal Screw Torque: Determined by the mounted terminal block, it ensures firm wiring and avoids problems such as poor contact and unstable signal transmission due to loose screws.