ABB CM574-RS (1SAP170400R0001) Communication Module | Replacement, Equivalent & Selection Guide
The ABB CM574-RS (part number 1SAP170400R0001) is a dedicated RS-485 serial communication module designed for the ABB AC500 PLC platform. It enables reliable Modbus RTU/ASCII and other RS-485 protocol communications between the AC500 CPU and field devices, drives, HMIs, and third-party controllers. This page provides full technical specifications, compatible replacement models, application guidance, and ordering information to help engineers and procurement teams make the right selection decision.
Technical Specifications
- Manufacturer: ABB
- Part Number: CM574-RS / 1SAP170400R0001
- Module Type: Serial Communication Module (RS-485)
- Interface: RS-485 (2-wire and 4-wire)
- Supported Protocols: Modbus RTU, Modbus ASCII, CS31
- Baud Rate: Up to 115,200 bps
- Isolation: Galvanically isolated serial interface
- Compatible Platform: ABB AC500 PLC (PM5xx, PM5xx-ETH CPU families)
- Mounting: Plugs directly into AC500 CPU communication slot
- Operating Temperature: -25°C to +60°C
- Supply Voltage: Powered via CPU backplane (no external supply required)
- Dimensions: Standard AC500 communication module form factor
- Weight: Approx. 200 g
- Certifications: CE, UL, cUL
Compatible Replacement & Equivalent Models
If the CM574-RS is unavailable or end-of-life in your region, the following models may serve as functional replacements or equivalents depending on your protocol and platform requirements:
- ABB CM572-DP (1SAP170200R0001) – PROFIBUS DP communication module for AC500; use when migrating to PROFIBUS networks
- ABB CM575-DN (1SAP170600R0001) – DeviceNet communication module for AC500; suitable for DeviceNet-based architectures
- ABB CM577-ETH (1SAP170700R0001) – Ethernet/IP & Modbus TCP module; recommended upgrade path when transitioning from serial to Ethernet
- ABB CM578-CN – CANopen communication module for AC500
- Third-party RS-485 gateways – Moxa NPort or Advantech EKI series can bridge RS-485 serial to Ethernet when a direct module replacement is not feasible
Note: Always verify firmware compatibility and CPU slot availability before substituting communication modules. Contact Konmask for pre-sales compatibility verification.
Why Choose the Original CM574-RS
- Native AC500 Integration: Designed and validated by ABB specifically for the AC500 platform — no gateway, no additional configuration overhead.
- Galvanic Isolation: Protects the CPU from ground loops and electrical noise common in industrial RS-485 networks.
- Dual RS-485 Mode: Supports both 2-wire (half-duplex) and 4-wire (full-duplex) wiring topologies.
- Proven Reliability: Widely deployed in power, water treatment, building automation, and manufacturing applications globally.
- Seamless Programming: Fully supported in ABB Automation Builder / PS501 Control Builder Plus with pre-built function blocks.
Typical Applications
- Modbus RTU communication with variable frequency drives (VFDs) and soft starters
- RS-485 network integration with energy meters, flow meters, and sensors
- HMI serial communication in panel-based control systems
- CS31 remote I/O expansion over RS-485
- Building automation systems (BAS) using Modbus protocol
- Water and wastewater SCADA integration
- Industrial serial device servers and legacy equipment interfacing
System Compatibility
- Compatible CPUs: ABB AC500 PM554, PM556, PM564, PM566, PM571, PM573, PM581, PM583, PM585, PM591, PM592, PM595 (and ETH variants)
- Software: ABB Automation Builder 1.x / 2.x, PS501 Control Builder Plus
- Communication Slot: Occupies one CM slot on the AC500 CPU module
- Not compatible with: AC500-S Safety CPUs (dedicated safety communication modules required), AC500-XS (extreme environment) without additional enclosure rating verification
Selection Guide
Use the table below to select the correct ABB AC500 communication module for your protocol:
- RS-485 / Modbus RTU / CS31 → CM574-RS (this module)
- PROFIBUS DP → CM572-DP (1SAP170200R0001)
- DeviceNet → CM575-DN (1SAP170600R0001)
- Ethernet / Modbus TCP / EtherNet/IP → CM577-ETH (1SAP170700R0001)
- CANopen → CM578-CN
- PROFINET → CM589-PNIO
Key selection criteria: Match the fieldbus protocol used by your field devices → verify CPU slot availability → confirm firmware version compatibility → check operating temperature range for your installation environment.
Quality Assurance & Sourcing
- Authenticity: All ABB modules supplied by Konmask.com are sourced from authorized distributors or verified surplus channels with full traceability documentation.
- Inspection: Each unit undergoes visual inspection and label verification prior to shipment.
- Packaging: Ships in original or equivalent ESD-safe anti-static packaging.
- Warranty: 12-month warranty against manufacturing defects. Replacement or refund issued for confirmed defective units.
- Documentation: ABB datasheet, wiring diagram, and firmware compatibility notes available upon request.
How to Order
- Part Number: CM574-RS / 1SAP170400R0001
- Minimum Order Quantity: 1 unit
- Lead Time: In-stock items ship within 1–3 business days; sourced items 7–21 business days
- Payment: T/T (bank transfer), PayPal, credit card via Shopify Payments
- Shipping: DHL Express, FedEx International, sea freight available for bulk orders
- RFQ: For volume pricing (>5 units) or urgent requirements, email [email protected] with your quantity and delivery timeline.
Replacement & Compatibility FAQ
Q: Can the CM574-RS replace the CM572-DP?
A: No. CM574-RS is RS-485/Modbus RTU; CM572-DP is PROFIBUS DP. They are not interchangeable — protocol and physical interface differ.
Q: Is the CM574-RS compatible with the AC500 V3 (PM5xx-ETH) CPUs?
A: Yes, the CM574-RS is compatible with both standard AC500 and AC500-eCo CPUs that have a CM slot. Verify your specific CPU model in the ABB compatibility matrix.
Q: Can I use two CM574-RS modules in one AC500 CPU?
A: This depends on the CPU model. Some AC500 CPUs support multiple CM slots. Refer to your CPU hardware manual for the maximum number of communication modules supported.
Q: What is the difference between CM574-RS and a standalone RS-485 converter?
A: The CM574-RS integrates directly into the AC500 backplane with native driver support in Automation Builder, offering lower latency, galvanic isolation, and no external power supply. A standalone converter requires additional wiring and configuration.
Q: Do you supply new or refurbished units?
A: We supply both new (factory-sealed) and tested-surplus units. Condition is clearly stated on each listing. Contact us if you require new-only supply.
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