Description
Description
The Allen-Bradley 1746-BLM is a high-performance, intelligent specialty module engineered for the plastics industry, specifically for use within the SLC 500 control system. It provides a tightly integrated solution for controlling blow molding machinery, including continuous extrusion, accumulator head, and reciprocating screw machines. The module functions as a co-processor, performing complex parison profile control and servo-loop tasks independently of the SLC 500 processor's scan time, ensuring high-speed, deterministic performance.
Features
- Four independent axes of PID control, typically configured for parison and accumulator push-out applications.
- High-speed loop update time of 100 microseconds for precise motion control.
- 256 points of profile resolution with interpolation for smooth wall thickness transitions.
- Dynamic profile adjustment capabilities, allowing for part weight changes without altering the established parison profile shape.
- Integrated 14-bit resolution analog I/O and digital I/O for comprehensive machine interface.
Applications
This module is designed for demanding plastic processing environments, including:
- Continuous extrusion blow molding machines.
- Accumulator head blow molding systems.
- Reciprocating screw blow molding machinery.
- Applications requiring high-speed, synchronized parison profile control.
Technical Specifications
| Brand |
Allen-Bradley |
| Product Line |
SLC 500 |
| Module Type |
Blow Molding Specialty Module |
| Axes |
4 Independent |
| Analog I/O |
4 Inputs / 4 Outputs (14-bit) |
| Digital I/O |
4 Inputs / 4 Outputs |
| Loop Update Time |
100 µs |
| Backplane Current (5V DC) |
110 mA |
| Backplane Current (24V DC) |
85 mA |
| Isolation Voltage |
500V DC |
| Operating Temperature |
0 to 60 degC (32 to 140 degF) |
Installation Guidelines
- Ensure the SLC 500 rack is powered down before inserting or removing the 1746-BLM module to prevent electrical damage.
- Install the module in an appropriate slot within the SLC 500 chassis, ensuring it is fully seated and the retaining screws are tightened.
- Follow standard industrial grounding practices for the chassis and I/O wiring to minimize EMI.
- Use shielded cables for analog signal connections to maintain signal integrity and prevent noise interference.
- Maintain adequate ventilation within the control cabinet to ensure the module operates within its specified temperature range of 0 to 60 degC.
FAQ
What is the primary function of the 1746-BLM?
The 1746-BLM acts as a dedicated co-processor for the SLC 500 system, offloading complex parison profile control and servo-loop tasks from the main CPU to provide high-speed, independent control of blow molding machinery.
Can I adjust the part weight while the machine is running?
Yes, the module allows operators to dynamically adjust profile parameters, such as overall part weight, without the need to alter the established shape of the parison profile.
