Omron ACC-36E 16-Input 16-Output UMAC I/O Board

Description

Product Introduction

The Omron Delta Tau ACC-36E is a high-density digital I/O expansion board designed specifically for the 3U Eurocard UMAC system architecture. It expands the machine-level discrete interfacing capabilities of PMAC2, Turbo PMAC, and Power PMAC controllers by adding 16 optically isolated digital inputs and 16 optically isolated digital outputs on a single slot card.

Unlike generic PLC remote I/O modules that rely on slow industrial bus scanning, the ACC-36E maps its inputs and outputs directly onto the internal UMAC memory bus. This allows execution loops in the motion processor—such as high-speed part registration, solenoid sequencing, interlocking, and alarm triggering—to read and set discrete states within the main servo clock or motion program execution cycle.

Key Technical Specifications

Application Scenarios & The “Trench” Experience

When an automated assembly cell or wafer handler suddenly halts with an unexplainable I/O fault, dead output drivers on a digital card are frequently the culprit. A shorted 24V pneumatic solenoid coil can blow out output transistors on an unbuffered card, leaving the PMAC unable to actuate vacuum grippers or safety interlocks. Swapping the damaged board for a fresh ACC-36E restores full isolated switching across all 32 channels without requiring changes to PLC memory pointer variables (M-variables) or motion programs in the Turbo PMAC IDE.

• Semiconductor & Wafer Handling – Interfacing pneumatic valves, vacuum sensors, and proximity switches in cleanroom robotic loaders.
• Precision CNC & Glass Processing – Managing coolant pumps, safety doors, tool changer position switches, and status beacons.
• Automated Packaging Lines – Handshaking trigger signals between inspection vision systems, reject actuators, and sorting gates.
• Test Benches & Flight Simulators – Reading control panel switches and driving LED indicators or relay coils in real-time hardware-in-the-loop (HIL) simulators.

ACC-36E

ACC-36E

Transparency SOP: Quality Assurance & Testing

We don’t just ship boxes; we test them on actual Omron Delta Tau UMAC chassis. Every surplus or refurbished ACC-36E undergoes a strict 5-stage verification process before shipping:

1. Inbound Physical Inspection: Complete audit of the 3U Eurocard edge connector, front-panel pin headers, checking for trace corrosion, burn marks, or solder joint fatigue.
2. UMAC Backplane Power-On Diagnostic: Board mounted into an active UMAC rack; verified logic voltage levels and bus decoding logic.
3. Optically Isolated Input Test: 24V DC signals applied across all 16 input channels individually to verify LED indication and exact register bit state changes in PEWIN32 / Power PMAC IDE.
4. Digital Output Load Testing: Actuated all 16 output switches under a 24V DC load to confirm current-sinking/sourcing capacity, voltage drop across switches, and zero cross-talk between pins.
5. Memory Clear & ESD Packaging: Base address jumpers verified, board cleared of previous field debris, and sealed in static-shielding ESD packaging.

The Veteran’s Tech Trap Guide (Crucial Value-Add)

⚠️ Watch the Base Address Jumper Settings (E-Points): The ACC-36E uses onboard jumpers to define its base address on the UMAC backplane bus. If you drop a replacement card into a rack with different jumper configurations, your PMAC M-variables (which point to specific memory addresses like Y:07C000) will read blank or incorrect data. Always mirror the jumper block layout from your old board before sliding the replacement into the rack.

❗ Don’t Forget the External Field Power: The optical isolation on the ACC-36E completely isolates the UMAC backplane +5V supply from the field side. For the field inputs and outputs to function, you must connect an external 12–24V DC field power source to the V+ and COM pins on the front connector. If field devices fail to actuate while software shows outputs turning ON, check your external 24V supply fuses.

⚠️ Output Current Limits: The output channels are solid-state drivers designed for logic handshakes, small relays, and indicator LEDs (typically 100 mA max per channel). Connecting large inductive loads—like heavy motor contactors or unsuppressed inductive solenoids—directly to the card will fry the onboard opto-couplers. Always use flyback diodes or interposing relays for heavy inductive loads.

❗ Ribbon Cable Pin Alignment: The front 34-pin ribbon connectors are easily plugged in shifted by one pin row if using non-shrouded headers. Double-check pin 1 alignment (marked by the red stripe on ribbon cables) before applying 24V field power to prevent shorting adjacent input and output channels together.

Frequently Asked Questions (FAQ for Conversion)

Q: What is the difference between the ACC-36E and other ACC-36 series cards? A: The “E” designation explicitly indicates the 3U Eurocard form factor designed to slide into the UMAC rack backplane. Non-E versions (like the legacy ACC-36A or ACC-36P) were built for older standalone PMAC board layouts or PCI slot forms.

Q: Can I install multiple ACC-36E cards in a single UMAC rack? A: Yes. You can install multiple ACC-36E cards in the same rack as long as each board is set to a unique base address via its onboard jumpers and your UMAC power supply has sufficient 5V overhead.

Q: Is the ACC-36E compatible with both Turbo PMAC and Power PMAC CPUs? A: Yes. The board interfaces directly via the standard 3U Eurocard UMAC backplane bus. Both Turbo PMAC2 and Power PMAC UMAC CPUs support the ACC-36E; you simply configure the corresponding I/O address mapping structure in the respective IDE software.

Q: Is the ACC-36E hot-swappable in a live rack? A: No. Standard UMAC expansion cards are NOT hot-swappable. Pulling or inserting the ACC-36E while the UMAC main power supply is active can cause backplane bus contention, potentially destroying the bus drivers on both the expansion card and the CPU card. Always shut down power before replacing hardware.

Q: What warranty is included with this replacement board? A: All our new surplus and bench-tested refurbished Omron Delta Tau cards come backed by a full 12-month direct replacement warranty. If a board fails during normal operation within one year, we will swap it out immediately from our stock.