PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1746-BAS-T is a high-speed SLC BASIC Module for the SLC 500 platform. This specialty module occupies a single slot in any 1746 modular or fixed chassis. It delivers enhanced processing speed compared to the standard 1746-BAS module. The unit provides data collection and integration functions for an SLC 500 controller system. It links controllers to human machine interface devices, modems, and serial printers.
The module features 24 KB of battery-backed RAM for storing user programs and data. Capacitive backup protects stored user memory during battery replacement procedures. A dedicated socket accepts optional 1771-DBMEM1 or 1771-DBMEM2 memory modules for nonvolatile program storage. The module also integrates a real-time clock and calendar with an internal battery supply. Its free-running internal clock operates with a 5 ms resolution for system timing.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Backplane Current (24 Volts) | 40 milliamps |
|---|
| Backplane Current (5 Volts) | 150 milliamps |
|---|
| Category | PLCs |
|---|
| Clock/Calendar Accuracy | ±1 minute/month at 25 °C (77 °F) +0, -6 minute/month at 60 °C (140 °F) |
|---|
| Communication Ports | PRT1:RS-232/423, -422, -485, PRT2:RS-232/423, -422, -485; DF1 PRT3:DH485 |
|---|
| Indicators | ACT; 485; PRT1; PRT2; FAULT; BAT LOW; LED 1; LED 2 |
|---|
| Memory | 24 KB, RAM |
|---|
| Module Type | SLC BASIC Module |
|---|
| Noise Immunity | Standard NEMA |
|---|
| Operating Shock | 30 g |
|---|
| Operating Temperature | 32 to 140 degrees Fahrenheit |
|---|
| UPC | 611320312294 |
|---|
| Vibration | Displacement: 0.015 in., peak-to-peak at 5...57 Hz Acceleration: 2.5 g at 57...2000 Hz |
|---|
| Weight | 1.50 lbs (0.68 kg) |
|---|
TECHNICAL INFORMATION
Features
- Occupies a single slot in any 1746 SLC 500 chassis.
- High-speed execution variant of the standard 1746-BAS module.
- Equipped with 24 KB of battery-backed RAM.
- Features capacitive memory backup during battery changes.
- Includes two isolated 9-pin D-shell serial communication ports.
- Supports DH485 communication for daisy-chain configuration.
- Built-in status LEDs indicate module and communication activity.
TECHNICAL INFORMATION
Applications
- Interfacing SLC 500 controllers with serial printers and data loggers.
- Industrial plant floor data acquisition and protocol translation.
- Serial communication handling with operator interfaces and modems.
TECHNICAL INFORMATION
Connections / Interfaces
- Port PRT1 provides isolated RS-232, RS-422, and RS-485 serial communication.
- Port PRT2 provides isolated RS-232, RS-422, and RS-485 serial communication.
- Port PRT3 supports DH485 protocol networking.
- Supports programming access via 1747-PIC converter over RS-232 to DH485.
TECHNICAL INFORMATION
Installation Guidelines
- Install the unit into any standard 1746 chassis I/O slot.
- Turn off chassis power before inserting or removing the module.
- Do not expose the hardware to surfaces carrying electrostatic charges.
- Electrostatic discharge can alter or destroy module memory contents.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure serial ports using the BASIC programming environment.
- Connect programming terminals through DH485 or serial converter interfaces.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley SLC 500 modular and fixed hardware systems.
- Supports 1771-DBMEM1 and 1771-DBMEM2 nonvolatile memory cartridges.
- Communicates with programming computers using a 1747-PIC interface converter.
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley SLC 500 modular and fixed hardware systems. Supports 1771-DBMEM1 and 1771-DBMEM2 nonvolatile memory cartridges. Communicates with programming computers using a 1747-PIC interface converter.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
What is the primary function of the Allen-Bradley 1746-BAS-T?
The module executes user-written BASIC programs. It interfaces SLC 500 controllers with peripheral serial devices.
How does the 1746-BAS-T differ from the standard 1746-BAS module?
The 1746-BAS-T is a higher-speed execution version of the 1746-BAS. It retains identical physical slot form factors.
What memory backup does the 1746-BAS-T provide?
The module contains 24 KB battery-backed RAM. Capacitive backup preserves memory during battery replacement.
What communication ports are available on the 1746-BAS-T?
It features two isolated 9-pin serial ports for RS-232, RS-422, or RS-485. Port 3 supports DH485.
