PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1746-BAS is an SLC BASIC Module designed for the SLC 500 hardware family. It occupies one slot in modular or fixed style chassis systems. The module handles 8 input words and 8 output words with SLC 5/01 or higher processors. It features 24 KB of battery-backed RAM to execute user BASIC programs and preserve data.
This unit interfaces with printers, modems, Human Machine Interface units, and operator interface terminals. Serial communication is handled via PRT1 and PRT2 at speeds reaching 19200 Baud in full duplex mode. It also includes a DH-485 network communication terminal. The hardware includes a real-time clock, a calendar, a text editor, and eight diagnostic LED indicators.
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 | RS-232/423, RS-422, RS-485, DH-485 |
|---|
| 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 | 10662468250037 |
|---|
| Vibration | Displacement: 0.015 in., peak-to-peak at 5...57 Hz Acceleration: 2.5 g at 57...2000 Hz |
|---|
| Weight | 1.25 lbs (0.57 kg) |
|---|
TECHNICAL INFORMATION
Features
- Single-slot form factor for SLC 500 modular and fixed hardware chassis.
- Integrated memory capacity providing 24 KB of battery-backed RAM.
- Three communication ports including PRT1, PRT2, and DH-485 interfaces.
- Full duplex serial transmission speeds from 300 up to 19200 Baud.
- Eight status LED indicators for module diagnostics and network activity.
- Built-in real-time clock and calendar with temperature-compensated timing accuracy.
- Standard NEMA electrical noise immunity for industrial plant installations.
TECHNICAL INFORMATION
Applications
- Machine-level data collection and integration across SLC 500 automation systems.
- Direct serial interfacing to industrial printers for automated report generation.
- Modem communication using DF1 protocol for remote data transmission.
- Operator interface terminal and Human Machine Interface device connectivity.
TECHNICAL INFORMATION
Connections / Interfaces
- PRT1 port configurable for RS-232/423, RS-422, and RS-485 serial communication modes.
- PRT2 port supporting RS-232/423, RS-422, RS-485, and DF1 modem protocols.
- Non-isolated DH-485 communication terminal requiring a 1747-AIC interface converter.
- PRT1 and PRT2 support baud rates from 300 to 19200 Baud.
- Configuring PRT2 for DF1 or modem operation automatically disables the DH-485 port.
TECHNICAL INFORMATION
Installation Guidelines
- Insert the module into any available single slot of an SLC 500 chassis.
- Verify backplane power loading of 150 mA at 5V DC and 40 mA at 24V DC.
- Connect the non-isolated DH-485 terminal to a network using an external 1747-AIC converter.
- Maintain an ambient operating temperature between 32 and 140 degrees Fahrenheit.
TECHNICAL INFORMATION
Configuration Guidelines
- Create and test custom routines using the integrated BASIC programming environment.
- Configure PRT1 and PRT2 communication parameters between 300 and 19200 Baud.
- Allocate 8 input words and 8 output words in the processor I/O table.
- Be aware that enabling DF1 on PRT2 turns off the DH-485 port.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley SLC 500 modular chassis and fixed hardware systems.
- Supports standard 8-word I/O data transfers with SLC 5/01 and higher processors.
- Connects to DH-485 networks when paired with a 1747-AIC link coupler.
TECHNICAL INFORMATION
Compliance and Certifications
- Standard NEMA electrical noise immunity.
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley SLC 500 modular chassis and fixed hardware systems. Supports standard 8-word I/O data transfers with SLC 5/01 and higher processors. Connects to DH-485 networks when paired with a 1747-AIC link coupler.
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 communication ports are provided on the 1746-BAS module?
The module provides PRT1, PRT2, and DH-485 communication ports for serial and network connectivity.
What happens to the DH-485 port when PRT2 is configured for DF1?
Configuring PRT2 for DF1 protocol or modem communication automatically disables the DH-485 port.
How much user memory is available on the 1746-BAS module?
The 1746-BAS module includes 24 KB of battery-backed RAM for user programs and data storage.
