Allen-Bradley 1746-BAS-5/02 SLC 500 BASIC Programming Module

Overview

The Allen-Bradley 1746-BAS-5/02 is a BASIC language programming module designed for the SLC 500 controller family. It provides an embedded BASIC-52 interpreter that allows engineers to develop custom control applications, perform complex data handling, and manage serial communication independently of the PLC scan cycle. This makes it ideal for operations that are not easily executed through standard ladder logic, such as ASCII-based communication or protocol conversion.

Key Features

• Supports BASIC-52 programming for flexible automation logic

• Dual serial ports supporting RS-232 and RS-422/423 interfaces

• Compatible with ASCII and binary data formats

• Enables custom communication protocols and serial device interfacing

• Executes programs independently from PLC scan timing

• Equipped with battery-backed RAM for data and program retention

• Onboard Flash EEPROM for firmware storage and updates

Technical Specifications

• Manufacturer: Allen-Bradley

• Product Line: SLC 500 Series

• Catalog Number: 1746-BAS-5/02

• Programming Language: BASIC-52

• User Memory: 8 KB battery-backed RAM

• Program Storage: 32 KB Flash EEPROM

• Serial Ports: 2 (1 x RS-232, 1 x RS-422/423)

• Supported Baud Rates: 110 to 19,200 bps

• Backplane Current Draw (5V DC): 550 mA

• Backplane Current Draw (24V DC): Not used

• Operating Temperature: 0°C to 60°C (32°F to 140°F)

• Battery Type: 1747-BA lithium battery

• Typical Applications: Barcode readers, printers, and custom serial devices

This module extends the flexibility of the SLC 500 system by adding programmable serial communication capabilities, making it suitable for connecting third-party devices, developing specialized data exchange protocols, and running independent background processes.

Application Scenarios

The 1746-BAS-5/02 is ideal for:

• Integration with barcode scanners and serial printers

• Data logging and text-based communication tasks

• Developing custom serial protocols between controllers and peripheral devices

• Advanced data manipulation and formatted output generation

FAQs

Q: Can the 1746-BAS-5/02 communicate with devices using ASCII protocols?
A: Yes, the module supports ASCII and binary communication, enabling flexible interfacing with serial devices.

Q: Does this module run independently from the main PLC logic?
A: Yes, it operates asynchronously from the PLC scan cycle, allowing background data handling.

Q: How is program data retained?
A: The module includes 8 KB of battery-backed RAM for user programs and 32 KB Flash EEPROM for permanent storage.

Q: Which battery is compatible for backup?
A: The module uses the 1747-BA lithium battery for data retention.