AB 1794-ID2 Series B FLEX I/O 2-Channel Incremental Encoder Module

AB 1794-ID2 Series B FLEX I/O 2-Channel Incremental Encoder Module

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 Guidelines for the Application, Installation, and Maintenance of Solid-State Control Equipment (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, not for use in residential environments. To be installed in a suitable enclosure which is flame retardant and internally accessible only by means of tools. Use galvanised yellow chrome steel DIN rails for earthing, avoid corrosive, oxidised or poorly conductive rail materials, fix rails at 200mm intervals and use end anchors.

Electrostatic protection: The equipment is sensitive to static electricity and should be operated by touching an earthed object to discharge static electricity, wearing an earthed wrist strap, avoiding touching connectors and circuitry components, using an electrostatic safe workstation if available, and storing in 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. For example, for use in Europe, equipment must be protected against UV rays, enclosure protection levels, etc. For use in North America, products are labelled with a temperature code, and when combining equipment, the overall temperature code must be taken into account and reviewed by the local regulatory agency. When operating in hazardous areas, it is strictly prohibited to disconnect equipment or connections while energised to prevent the risk of explosion.

Module Installation

Mounting to Terminal Block: Mount the module to the 1794 - TB3 or 1794 - TB3S terminal block, turn the key switch to position 1 before mounting to ensure that the Flexbus connector is fully extended, insert the module into the groove with care and securely mount it to prevent debris from falling into the module, as an electrically charged plug or unplug may cause an explosion.

Wiring: Connect the input lines (A +, A -, B +, B -, Z +, Z -, G +, G -), the encoder common, the signal shield, the encoder power supply line, the +V DC power supply and the DC return to daisy-chain the power supply. The wiring method varies for different terminal blocks, so you need to refer to the corresponding tables and diagrams for operation.

Module Configuration: Configure the module functions by setting the control words, such as counting mode, preset function, calibration function, gate control function, memory control function, etc. Control words 0 and 1 are used to set the channel function, and control word 2 is used to set the filter function.

Specification

Basic parameters

Number of inputs and outputs: 2 input channels, 4 inputs (A, B, Z and G) for each counter.

Recommended terminal blocks: For 1794-TB3, 1794-TB3S, 1794-TBN, 1794-TBKD, 1794-TB37DS and others.

Key switch position: 1.

Enclosure type rating: None (open), meaning that it is used in an additional protective enclosure to meet the protection requirements of the specific application.

Electrical parameters

Input Characteristics: Input pulse width minimum 2μs to be recognised; maximum counting frequency 100kHz; on-state voltage min. 6V DC, max. 26.4V DC (24V DC +10%), current min. 3mA @ 6V DC, nominal 9mA @ 12V DC, max. 15mA @ 24V DC; off-state voltage min. 26.4V DC, max. 3V DC.

Isolation and Power Supply: Isolation voltage tested at 500V AC for 60s; FlexBus current 5mA @ 5V DC; Maximum power consumption 5W @ 26.4V DC, maximum thermal dissipation 17.1BTU/hr @ 26.4V DC; External power supply requirements 12 - 24V DC (+10%), supply current 150mA at 12V DC, 75mA at 24V DC. Power supply current is 150mA at 12V DC and 75mA at 24V DC.

Physical Parameters

Dimensions: Mounted dimensions are 46 x 94 x 53mm (1.8 x 3.7 x 2.1in.) for easy layout and installation in equipment.

Indicators: 1 green/red power/status indicator and 12 yellow status indicators are provided to indicate the operating status of the module.

Conductors: Belden 8761 is recommended for input conductors up to 304.8m (1000ft.); wiring category 2 for planning conductor wiring.

Environmental parameters

Temperature Range: Operating temperature 0 - 55°C (32 - 131°F), but be careful not to connect the maximum input voltage to all inputs at the same time when the module ambient temperature is expected to exceed 40°C; Storage temperature - 40 - 85°C (-40 - 185°F).

Humidity and other: Relative humidity requirements are 5 - 95% non-condensing; capable of withstanding a certain level of vibration and shock, with vibration conditions of 5g @ 10 - 500Hz, 30g for operational shock, 50g for non-operational shock; in terms of EMC, conforms to the relevant standards, such as the Class A standard in CISPR 11 (IEC 61000-6-4) (with a suitable enclosure), and has a good understanding of the electrostatic discharge (ESD), radiated radio frequency (RF) (-40 - 185°F) and the electromagnetic compatibility (EMC). ESD, RF, EFT/B, surge transients and conducted RF.