Industrial Serial Communication Solution – ABB CI531 3BSE003825R1 | AC 500 Series
The ABB CI531 (Part No. 3BSE003825R1) is a dedicated RS-232 interface submodule engineered for the ABB AC 500 and Advant Controller platforms. It provides a reliable, electrically isolated serial communication channel that bridges modern PLC infrastructure with legacy field devices, HMI panels, barcode readers, weigh scales, and third-party instrumentation — all without additional protocol converters or external gateways.
Where This Product Is Used
The CI531 is specified by control engineers across industries where RS-232 serial communication remains the dominant or legacy-mandated interface standard:
- Water & Wastewater Treatment Plants — connecting PLCs to flow meters, analyzers, and SCADA terminals over point-to-point RS-232 links
- Pulp & Paper Mills — integrating ABB Advant controllers with legacy DCS operator stations and historian servers
- Power Generation & Substations — serial link to protection relays, RTUs, and energy meters using ASCII or Modbus RTU protocols
- Food & Beverage Packaging Lines — interfacing with checkweighers, label printers, and vision inspection systems
- Pharmaceutical Manufacturing — GMP-compliant serial data logging to batch record systems and LIMS
- Oil & Gas Terminals — point-to-point communication with tank gauging systems and custody transfer meters
- Building Automation & HVAC — serial integration with chillers, boilers, and BMS gateways
Technical Specifications
| Part Number | CI531 / 3BSE003825R1 |
| Manufacturer | ABB |
| Module Type | RS-232 Interface Submodule |
| Compatible Platform | ABB AC 500, Advant Controller 31/41/70/110/160/410/450/510 |
| Interface Standard | RS-232C (EIA/TIA-232) |
| Connector Type | 9-pin D-Sub (DB9) |
| Baud Rate | Up to 19,200 bps (configurable) |
| Communication Mode | Full-duplex, point-to-point |
| Supported Protocols | ASCII, Modbus RTU, proprietary ABB serial protocols |
| Electrical Isolation | Optically isolated |
| Operating Temperature | 0 °C to +55 °C |
| Storage Temperature | -40 °C to +70 °C |
| Weight | 140 g |
| Housing | DIN-rail mountable submodule form factor |
| Power Supply | Supplied via backplane from host CPU module |
| Certifications | CE, UL (refer to ABB documentation for full listing) |
Why Engineers Specify This Model
- Native backplane integration — slots directly into the AC 500 CPU submodule bay; no external wiring harness or adapter required
- Optical isolation — protects the CPU from ground loops and transient voltages common in industrial environments
- Protocol flexibility — supports ASCII framing and Modbus RTU, covering the vast majority of legacy serial device requirements
- Proven longevity — part of ABB’s long-lifecycle Advant/AC 500 ecosystem, with spare parts availability extending well beyond typical product EOL
- Compact form factor — adds a serial port without consuming a full I/O slot, preserving rack space for I/O expansion
- Deterministic latency — hardwired serial path with no Ethernet stack overhead, critical for time-sensitive polling applications
Complete System Bill of Materials
A typical AC 500 node with CI531 serial communication requires the following components:
- ABB AC 500 CPU Module (e.g., PM571, PM581, PM591, PM631, PM665, PM695)
- CI531 3BSE003825R1 — RS-232 Interface Submodule (this item)
- ABB TB511 or TB521 Terminal Base Unit (CPU mounting base)
- ABB PS501 Control Builder Plus (programming software, if not already licensed)
- DB9 serial cable (null-modem or straight-through, depending on target device)
- 24 VDC power supply (e.g., ABB CP-E 24/5.0 or equivalent)
- DIN rail and enclosure (customer-supplied)
Contact Konmask for bundle pricing on multi-component orders.
Compliance & Industry Standards
- CE Marking — compliant with EU Low Voltage Directive and EMC Directive
- UL Listed — suitable for use in North American industrial control panels
- EIA/TIA-232-F — full compliance with the RS-232 electrical and mechanical standard
- IEC 61131-2 — programmable controller hardware standard (via AC 500 platform)
- RoHS Compliant — restriction of hazardous substances per EU Directive 2011/65/EU
Always verify the current ABB datasheet (Doc. No. 3BSE003825R1) for the latest certification status applicable to your jurisdiction.
Quality Assurance & Sourcing
- Authentic ABB product — sourced through verified industrial distribution channels; not refurbished or third-party remanufactured
- Pre-shipment inspection — each unit is visually inspected and packaging integrity verified before dispatch
- Traceability — ABB original part number and date code retained on label; available for documentation upon request
- Warranty — 12-month Konmask warranty against manufacturing defects; RMA process available
- Stock location — held in climate-controlled warehouse; ships within 1–3 business days of order confirmation
How to Source This Part
- Add to cart — click the purchase button above to place an order directly on Konmask.com
- Request a quote — for quantities >1 or project BOM pricing, email support@konmask.com with your project details
- Lead time inquiry — if the item shows out of stock, contact us; we maintain supplier relationships for expedited sourcing
- Export & cross-border orders — we support international shipping with commercial invoice and packing list documentation; HS Code available on request
- Payment — T/T bank transfer, credit card, and trade account terms available for qualified buyers
Application-Specific FAQ
Q: Can the CI531 communicate with a Modbus RTU slave device?
A: Yes. The CI531 supports Modbus RTU master and slave modes when configured via ABB Control Builder. It is commonly used to poll Modbus-enabled meters, drives, and sensors.
Q: Is the CI531 compatible with the AC 500 V2 (PM5xx) CPU range?
A: The CI531 is designed for the Advant Controller and early AC 500 submodule architecture. Compatibility with specific PM5xx CPUs should be verified against ABB’s compatibility matrix or by contacting our technical team.
Q: What is the maximum cable length for RS-232 with this module?
A: The EIA-232 standard specifies a maximum of 15 m (50 ft) at full baud rate. In practice, lower baud rates and shielded cable can extend this; however, for longer distances, consider an RS-485 interface module instead.
Q: Can I use the CI531 for ASCII printer or barcode scanner integration?
A: Yes. ASCII mode allows the AC 500 CPU to send and receive raw character strings, making it suitable for label printers, barcode readers, weigh terminals, and similar peripherals.
Q: Do you provide the ABB programming cable or software?
A: Programming cables and PS501 Control Builder licenses are available separately. Contact us with your existing license details and we can advise on the correct accessories.
Q: What is the lead time for this part?
A: In-stock units ship within 1–3 business days. For out-of-stock situations, typical sourcing lead time is 2–4 weeks depending on ABB supply chain availability.
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