Key Technical Specifications
- Product Model: PMAC-2ACC8T
- Manufacturer: Delta Tau Data Systems
- Device Type: 8-Axis PMAC2 Servo Interface Board
- Memory: 8K x 16-bit Dual-Port RAM (DPRAM)
- Compatibility: Delta Tau PMAC and PMAC2 architectures
- Data Transfer: Real-time data and servo information sharing
- Bus Interface: ISA (Industry Standard Architecture)
- Axis Channels: Supports up to 8 axes (via PMAC2 CPU)
- Signal Types: Analog (±10V), PWM, Pulse/Direction
- Mounting: Internal PC expansion slot
- Dimensions: Standard ISA full-length form factor
- Standards Compliance: Industrial motion control standards
Product Introduction
The DELTA TAU PMAC-2ACC8T is an 8-axis servo interface accessory designed to expand the capabilities of PMAC2 motion controllers. It bridges the gap between the PMAC CPU and external servo amplifiers while providing dedicated memory for host communication.This board integrates 8K x 16-bit Dual-Port RAM to enable high-speed data sharing between the PMAC system and the host PC. Motion engineers value this specific PMAC-2ACC8T model because it eliminates communication bottlenecks during complex multi-axis interpolation, ensuring real-time servo updates without CPU overhead.
Installation & Configuration Guide
Preparation (10 min)
Power down the host PC and unplug all cables. Open the chassis and locate an available ISA slot. Gather your mounting screws and anti-static wrist strap. Review the DIP switch settings on the old board.Removal (5–10 min)
Disconnect the ribbon cables from the PMAC-2ACC8T. Remove the two mounting screws securing the bracket. Gently pull the card straight up from the ISA slot. Store in an anti-static bag immediately.Installation (10 min)
Align the PMAC-2ACC8T edge connector with the ISA slot. Press down evenly until fully seated. Secure the bracket with mounting screws. Reconnect the ribbon cables exactly as they were on the old board.Power-On & Test (10 min)
Power on the host PC. Open your Delta Tau software (e.g., Pcomm32). Execute a “Download” to verify communication. Check I-variables to confirm the 8K DPRAM is recognized. Run a basic jog test on all 8 axes.
Troubleshooting Quick Reference
| Symptom | Probable Cause | Immediate Action |
|---|---|---|
| No Comm | Bad ISA seating | Reseat card. Check for bent pins. |
| DPRAM Error | Memory conflict | Verify base address DIP switches. |
| Axis Fault | Ribbon cable | Inspect cable for damage. Reseat connectors. |
| Download Fail | Firmware mismatch | Check PMAC2 CPU firmware revision. |
| Intermittent | Loose connection | Tighten mounting screws. Clean contacts. |
Dimensions, Mounting & Wiring Notes
The DELTA TAU PMAC-2ACC8T uses a standard ISA full-length form factor. It mounts via a single rear bracket screw. The board connects to the PMAC2 CPU via a high-density ribbon cable. Ensure the cable is not pinched during chassis closure. Verify the ISA slot is not shared with other legacy cards to avoid IRQ conflicts.
FAQ
Can I use this with a Turbo PMAC?
No. The PMAC-2ACC8T is specifically designed for PMAC2 architecture. Turbo PMAC uses different accessory boards.I forgot my DIP switch settings. What now?
Check the silkscreen on the board itself. I always photograph DIP switches before removal. If unmarked, consult the original PMAC2 manual for default base addresses.Is the 8K DPRAM enough for my application?
For most standard motion tasks, yes. If you are streaming massive trajectory data, consider upgrading to a newer Power PMAC platform.Does this board handle analog and digital outputs?
No. This is an interface and memory expansion board. Actual analog/digital signal generation is handled by the PMAC2 CPU or dedicated axis interface boards.What is the lead time on refurbished units?
We typically ship within 24 hours if in stock. All units undergo full functional testing before shipment.I need to replace a PMAC-2ACC8T. Any gotchas?
Yes. Always verify the exact revision letter. Some early revisions had different DPRAM addressing schemes. Send us a photo of your old board’s label for confirmation.
