Description
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GRBTU 3BSE013175R1
GRBTU 3BSE013175R1
3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Designation | GRBTU |
| Ordering Number | 3BSE013175R1 |
| Function | Rack Bus Terminator / Backplane Termination |
| System Compatibility | ABB AC 800M with S800 I/O |
| Mounting Position | Last physical slot of the S800 I/O rack |
| Electrical Nature | Passive (no external power required) |
| Purpose | Impedance matching and reflection suppression on the I/O bus |
| Connector | S800 backplane edge connector |
| Operating Temperature | Typical industrial range (0 °C to +55 °C class) |
4. Product Introduction (Anti-Template)
Every S800 I/O rack in an AC 800M system requires proper termination of the backplane bus. The GRBTU (3BSE013175R1) is the passive terminator that performs this function. It is installed in the last occupied slot of the rack and matches the characteristic impedance of the parallel I/O bus.
Without correct termination, high-speed digital signals reflect along the backplane, producing ringing, data corruption, intermittent module communication failures, or complete I/O bus errors. The GRBTU eliminates these reflections, ensuring stable and reliable communication between the controller and all I/O modules in the rack. It contains no active electronics and draws no power.
GRBTU 3BSE013175R1
5. QC, Procurement & Logistics SOP
- Inbound Verification – Confirm full markings (GRBTU and 3BSE013175R1), edge-connector condition, and housing integrity. Photograph all labels.
- Live Rig Testing – Install in the last slot of a compatible S800 rack, power the system, and verify that the I/O bus initializes cleanly with no termination-related diagnostic alarms.
- QA & Packaging – After inspection, protect the edge connector, clean the unit, and pack in protective packaging with desiccant.
- Global Logistics & Export Compliance – Classify under the correct HS code for industrial control accessories. Packaging must protect against mechanical damage; export documentation is prepared to minimize customs delays.
GRBTU 3BSE013175R1
GRBTU 3BSE013175R1
6. Technical Pitfalls & Integration Warnings
Mandatory Installation – ABB design rules require a GRBTU in every S800 I/O rack. Omitting it frequently triggers “I/O bus error” or “module not responding” diagnostics.
Correct Slot – The terminator must be placed in the last physical slot of the rack. Installing it in an intermediate position leaves part of the bus unterminated.
Passive Device – No configuration or power connection is required. Attempts to treat it as an active module will lead to incorrect troubleshooting.
Physical Fit – Ensure the edge connector seats fully. Partial insertion can cause intermittent bus problems that appear as module faults.
7. Frequently Asked Questions (FAQ)
What is the realistic global lead time for a verified GRBTU?
Stock units typically ship within 1–5 business days after verification. Air freight adds standard transit time.
What does the GRBTU do?
It is a passive bus terminator that provides impedance matching on the I/O backplane to prevent signal reflections.
Where must it be installed?
In the last physical slot of each I/O rack.
Does it require power or configuration?
No. It is a completely passive device.
Is it required for every rack?
Yes. ABB system design rules mandate its use for proper bus operation and to avoid diagnostic alarms.
What system is it used with?
ABB AC 800M controllers with I/O modules.
Can the system run without it?
Technically the rack may power up, but communication reliability will be compromised and diagnostic errors are likely.
