Description
Key Technical Specifications
| Parameter | Value |
|---|---|
| Model Number | 1MRS050729 |
| Brand | ABB |
| Series | AC500 |
| Product Type | Relay Output Module |
| Output Channels | 16 (Form 1A, 3NO) |
| Load Current | 1 A AC/DC per channel |
| Load Voltage | 250 V AC/DC |
| Switching Time | ≤ 10 ms |
| Power Supply | 24 V DC |
| Power Consumption | 20 W |
| Operating Temperature | -20°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Protection Rating | IP20 |
| Mounting | DIN rail |
| Weight | 0.708 kg |
| Certifications | UL 508, CE, C-Tick, CSA C22.2 No. 142 |
Product Introduction & Supply Chain Strategy
The ABB 1MRS050729 is a 16-channel relay output module for the AC500 PLC platform. It switches discrete loads — motor contactors, solenoid valves, pilot lights, and alarm annunciators — directly from the PLC backplane. Typical installations include manufacturing lines, material handling systems, and skid-mounted process equipment.
This module is offered as New Surplus, not refurbished or used. The cost sits below OEM list pricing but above a refurbished gamble. That delta buys you verified OEM-origin, a full warranty, and zero prior operational stress. Refurbished modules carry hidden risk: degraded relays, capacitor aging, and undocumented repairs. When a used relay module fails, the cost isn’t the replacement — it’s the emergency shutdown, the production loss, and the maintenance overtime. Stocking a genuine new spare is a low-cost insurance policy against unplanned downtime.
- 1MRS050729
- 1MRS050729
Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
- Lock out and tag out the PLC chassis power.
- Gather tools: ESD wrist strap (mandatory), small flathead screwdriver, and a digital camera or phone.
- Critical: Photograph the existing module’s wiring and any DIP switch or jumper settings before removal.
Stage 2: Removal
- Disengage the retaining clips at the top and bottom of the module.
- Gently pull the module straight out from the backplane. Do not rock it side-to-side — this bends backplane pins and damages the chassis.
Stage 3: Installation (Clone & Seat)
- Verify any configuration switches on the new module match the old unit exactly (node address, baud rate, or range settings).
- Align the module with the backplane guide slots and press firmly until both retaining clips snap into place.
Stage 4: Power-On & Testing
- Re-energize the chassis power.
- Observe the LED status: RUN should illuminate (steady or flashing per normal operation). ERR should remain off.
- Cycle the outputs from the PLC logic to confirm switching and correct wiring termination.
Firmware/Software Versions & Upgrade Notes
The 1MRS050729 is a hardware relay module with no user-accessible firmware. All configuration is handled via the AC500 CPU’s I/O mapping and the Control Builder software.
Version compatibility note: Verify the hardware revision level if replacing an older module. Confirm that the AC500 firmware supports the module revision (typically revision D or later for full compatibility with newer CPU firmwares).
Critical warning: Do not hot-swap this module. Always power down the PLC rack before insertion or removal to prevent backplane damage or output state faults.
Frequently Asked Questions (FAQ)
Q: Why is this New Surplus cheaper than ABB list price but more expensive than refurbished units?
A: The price reflects the cost of sourcing verified, OEM-origin new units from global inventory. You avoid the OEM’s full retail margin but also avoid the hidden failure risk of refurbished stock. It’s the sweet spot between price and reliability.
Q: Is this module still active or is it EOL?
A: The 1MRS050729 remains in ABB’s active lifecycle support phase. That means new units are still available, but AC500 hardware revisions change over time. For legacy control cabinets, securing a verified new spare now prevents the scramble when the module eventually enters the Limited phase.
Q: Can I hot-swap this module while the PLC chassis is powered?
A: No. Always power down the chassis before removal or installation.
Q: Does replacing this module require downloading the PLC program?
A: No. The program resides in the CPU. Once the new module is installed and powered up, the CPU automatically re-initializes the I/O bus and applies the existing configuration.
Q: What is the warranty period and coverage?
A: The module carries a standard 1-year warranty against manufacturing defects. Coverage applies to the module hardware — not to any field wiring, external loads, or damage from improper installation.
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