Description
Description
The Allen-Bradley 1746-BAS-T is a high-speed BASIC module designed for the SLC 500 platform. It functions as an independent co-processor, enabling the execution of complex calculations, string manipulation, and custom communication protocols without impacting the main PLC processor's scan time. The '-T' designation signifies an enhanced clock speed compared to the standard 1746-BAS, providing superior performance for high-throughput data collection and interfacing with external devices such as HMIs, barcode scanners, and modems.
Features
- High-speed processing for advanced data handling and custom BASIC programming.
- Three integrated communication ports for versatile connectivity.
- Supports RS-232, RS-422, and RS-485 electrical standards on PRT1 and PRT2.
- Dedicated DH-485 port (PRT3) for network integration and daisy-chain configurations.
- 24 KB of battery-backed RAM for program and data storage.
- Efficient co-processor architecture to reduce main CPU load.
Applications
This module is widely used in industrial automation for custom protocol emulation, complex data processing, and interfacing legacy or third-party serial devices into an SLC 500 control system. It is ideal for applications requiring rapid data throughput that exceeds the capabilities of standard communication modules.
Technical Specifications
| Brand |
Allen-Bradley |
| Product Line |
SLC 500 |
| Module Type |
High-Speed BASIC Module |
| Memory |
24 KB (Battery-backed RAM) |
| Backplane Current (5V DC) |
150 mA |
| Backplane Current (24V DC) |
40 mA |
| Operating Temperature |
0 to 60 degC (32 to 140 degF) |
| Shock Resistance |
30 g |
| Vibration Resistance |
2.5 g @ 57-2000 Hz |
Installation Guidelines
- Ensure the SLC 500 chassis power is disconnected before installing or removing the module.
- The module must be seated firmly in the chassis slot to ensure proper backplane connection.
- Use shielded communication cables for all serial connections to minimize EMI interference.
- Ensure proper grounding of the chassis to a common earth ground to prevent electrical noise.
- Handle the module using ESD-safe practices to prevent damage to internal circuitry.
- Verify that the battery is properly installed and connected to maintain memory during power cycles.
FAQ
What is the primary difference between the 1746-BAS and the 1746-BAS-T?
The 1746-BAS-T is a high-speed version of the standard BASIC module, featuring a faster clock speed for improved processing performance in demanding data-intensive applications.
Can I use this module to communicate with third-party serial devices?
Yes, PRT1 and PRT2 support RS-232, RS-422, and RS-485 standards, allowing you to write custom BASIC programs to interface with a wide range of third-party serial hardware.
