Description
Product Introduction
The B&R 7EX484.50-1 is a bus receiver and slave controller module belonging to the legacy B&R System 2003 automation family. Designed for multi-rack automation architectures, this card allows industrial machines to distribute I/O modules across secondary backplane racks without requiring separate CPU processors in every rack.
Managed directly by the primary system CPU via B&R Automation Studio, the 7EX484.50-1 regulates local power delivery to the secondary sub-rack while continuously updating I/O image tables across the expansion bus. In our field experience, replacing a failing 7EX484.50-1 card resolves intermittent remote sub-rack offline faults, backplane communication drops, and I/O bus parity errors across multi-rack systems.
Key Technical Specifications
| Parameter | Value |
| Part Number | 7EX484.50-1 |
| Manufacturer | B&R Industrial Automation (Bernecker + Rainer) |
| System Family | B&R System 2003 / System 2005 |
| Module Function | Expansion Bus Receiver / Remote Sub-Rack Controller |
| Supply Voltage | 24 VDC Nominal System Input |
| Addressing | Dual Front-Panel Rotary Switches (Station Address Setting) |
| Status Display | Diagnostic LEDs (OK, TX, RX, STATUS) |
| Operating Temperature | 0°C to +55°C |
Application Scenarios & The “Trench” Experience
A large automated wood processing facility experienced sudden production stoppages when Expansion Rack 2 lost synchronization with the main System 2003 CPU rack. All digital and analog I/O cards in the secondary rack showed orange status indicators, and the main controller logged a “Remote Sub-Rack Bus Timeout” error.
- Automated Material Handling – Distributed Sub-Racks – Connects remote sensor/actuator racks located along extensive conveyor lines.
- Plastics & Injection Molding Machinery – Auxiliary Station Control – Interfaces remote mold-temperature and valve racks to the central controller.
- Woodworking & CNC Assembly Lines – Multi-Zone I/O Processing – Handles localized field signals while maintaining deterministic synchronization with the main PLC.
Diagnostics pointed to corrupted serial bus transceiver circuits inside the existing bus receiver module. Maintenance staff unlatched the power connector, noted the rotary station address settings (Station 02), and inserted a bench-tested B&R 7EX484.50-1 replacement. Upon restoring 24 VDC power, the TX/RX LEDs began flashing in sync with the central CPU, clearing all bus fault alarms immediately.
7EX484.50-1
7EX484.50-1
Transparency SOP: Quality Assurance & Testing
Every 7EX484.50-1 module undergoes rigorous physical and functional verification before clearing for shipment:
- Inbound Mechanical Inspection: Checking backplane edge connector pins, housing retention clips, front terminal blocks, and rotary address switches.
- Power Supply & Logic Circuit Test: Applying 24 VDC to verify onboard voltage regulators, internal power rails, and initial LED power-on sequences.
- Rotary Address Switch Verification: Testing rotary switch contacts across all hex positions to ensure clean station address encoding.
- Live Expansion Bus Communication Test: Inserting the card into a System 2003 expansion test bench linked to a master CPU, transferring high-frequency cyclic I/O data under thermal load.
- ESD Protective Packaging: Sealing the card inside anti-static ESD shielding bags with custom shock-absorbing foam inserts for transport.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
- ⚠️ Match Station Address Rotary Switches Exactly: Before applying power to the replacement module, set the front-panel rotary switches (
STATION) to match the exact hex/decimal address of the original unit. An incorrect address prevents the main CPU from assigning the rack to its memory map. - ❗ Verify Expansion Bus Termination: Ensure that the bus expansion cable is securely latched into the module’s interface ports. Loose expansion cables or missing line termination jumpers will cause intermittent packet loss and sporadic PLC halts.
- ⚠️ De-energize Backplane Power Before Swapout: Never pull or seat the 7EX484.50-1 module while the 24 VDC supply or backplane is energized. Hot-swapping backplane bus modules can trigger electrical arcing on bus communication pins and damage surrounding I/O cards.
Frequently Asked Questions (FAQ for Conversion)
Q: Does replacing the 7EX484.50-1 require downloading code from Automation Studio?
A: No. The 7EX484.50-1 is a hardware bus receiver interface. As long as you match the rotary station address switches to the original card’s settings, no PLC software download is needed.
Q: Can this module supply power to the local expansion rack I/O cards?
A: Yes, the module connects to incoming 24 VDC power and distributes regulated logic power to the local System 2003 backplane slots.
Q: Is the 7EX484.50-1 still manufactured by B&R?
A: The System 2003 product line is a legacy automation platform. Tested units are available through specialized industrial surplus and reconditioned automation suppliers.
Q: What do the TX and RX LEDs on the front panel indicate?
A: The TX (Transmit) and RX (Receive) LEDs indicate active data transmission between the main CPU master and this expansion sub-rack receiver.
Q: What warranty coverage comes with this surplus B&R module?
A: Every tested 7EX484.50-1 unit is backed by our full 12-month replacement warranty.
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