This sequence control module manages the execution order of CNC machine operations. It coordinates tool changes, spindle speeds, and axis movements precisely. The unit integrates into the FANUC Series control architecture seamlessly. Its advanced logic processing ensures smooth transitions between machining sequences.
Control Architecture and Processing Capabilities
The module features a dedicated microcontroller for sequence logic execution. It processes up to 256 discrete steps per machining program. The unit stores multiple sequence programs in its onboard memory. Each program can contain conditional branches and subroutine calls.
| Parameter | Specification |
|---|---|
| Model | A20B-0003-077 |
| Processor Type | 16-bit dedicated logic controller |
| Clock Speed | 20 MHz |
| Program Memory | 64 KB RAM |
| Storage Memory | 32 KB EEPROM |
| Sequence Steps per Program | 256 maximum |
| Conditional Branches | 64 per program |
| Subroutine Levels | 8 nesting levels |
| Discrete Inputs | 16 points, 24 V DC |
| Discrete Outputs | 12 points, relay type |
| Timers | 8 onboard, 0.01-999.99 seconds |
| Counters | 4 onboard, 16-bit |
| Power Supply | 24 V DC ±10%, 350 mA |
| Power Consumption | 8.4 W maximum |
Physical Dimensions and Mounting
This sequence module measures 220 mm in length and 160 mm in width. Its PCB thickness is 1.6 mm for mechanical durability. The module weighs approximately 0.42 kg including all components. You can mount the unit inside the CNC control cabinet using standoffs.
Component Architecture and Onboard Features
The A20B-0003-077 incorporates over 150 surface-mount components on the PCB. Major components include the processor, memory chips, and I/O drivers. The board also features an onboard crystal oscillator for precise timing. Test points on the PCB facilitate diagnostic measurements during maintenance.
Interface Connectivity and Signal Routing
A 50-pin ribbon cable connector handles all I/O signal connections. The module also provides a separate programming port for configuration uploads. Each I/O point connects to field devices through terminal blocks. The board routes signals through opto-isolators for noise immunity.
Sequence Programming and Configuration
You can program the module using ladder logic or mnemonic instruction sets. The unit supports both online and offline programming methods. Stored programs retain their data during power-off conditions. The module includes password protection for program security.
Diagnostic Functions and Fault Detection
The module continuously monitors its internal operating conditions. It triggers an alarm output when it detects a programming error. The unit also logs the last 50 sequence events for troubleshooting. This diagnostic data helps you identify root causes quickly.
Details
| Weight | 0.25 kg |
|---|---|
| Dimensions | 220 × 160 × 20 mm |
Reviews
There are no reviews yet.