ABB CM592-DP 1SAP173200R0001 PLC Communication Module – AC500 Series

ABB CM592-DP 1SAP173200R0001 — PROFIBUS-DP Communication Module for AC500 PLC Platform

The ABB CM592-DP (order reference 1SAP173200R0001) is a dedicated fieldbus communication module designed exclusively for the ABB AC500 programmable logic controller family. It provides a single-channel PROFIBUS-DP interface that operates in either DP Master (Class 1) or DP Slave mode, enabling deterministic, cyclic data exchange between the AC500 CPU and up to 125 PROFIBUS-DP slave stations on a single network segment. The module occupies one of the two left-side communication slots on the AC500 CPU terminal base, drawing its operating power entirely from the AC500 backplane — no external 24 VDC supply is required for the module itself.

In a control architecture context, the CM592-DP functions as the fieldbus gateway between the AC500’s internal S-Bus backplane and the external PROFIBUS-DP segment. The AC500 CPU communicates with the CM592-DP over the high-speed internal S-Bus, which operates at a fixed internal clock rate independent of the PROFIBUS baud rate. This architectural separation means that PROFIBUS network load, cable length, or slave response latency does not directly affect the CPU’s internal scan cycle — a critical design advantage in mixed-speed installations where some PROFIBUS slaves operate at 93.75 kbit/s while others run at 12 Mbit/s on separate segments.

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Technical Parameters

Hardware Logical Analysis

The CM592-DP’s internal architecture is built around a dedicated PROFIBUS-DP ASIC (application-specific integrated circuit) that handles all protocol-layer processing — token passing, frame encoding/decoding, cyclic data mapping, and error detection — independently of the AC500 CPU. This offload architecture ensures that PROFIBUS bus management does not consume CPU processing cycles, preserving the AC500’s deterministic scan time even when the PROFIBUS segment is operating at maximum slave count or experiencing high diagnostic traffic.

Optical Isolation Boundary: The RS-485 physical layer driver is galvanically isolated from the module’s internal logic circuitry. This isolation barrier — rated to withstand transient voltages common in industrial cable runs — prevents ground loop currents and common-mode noise from propagating into the AC500 backplane. In environments with variable-frequency drives (VFDs) or large motor starters sharing cable trays with PROFIBUS cabling, this isolation is a primary line of defense against communication faults.

EMC Design: The module’s PCB layout follows IEC 61000-4 series immunity requirements. Decoupling capacitors are placed at the RS-485 driver stage to suppress high-frequency conducted emissions. The DB9 connector shell is bonded to the module’s chassis ground, providing a low-impedance path for shield drain currents — consistent with PROFIBUS installation guidelines that require cable shield continuity to be terminated at one end only to avoid circulating currents.

Watchdog and Fault Isolation: An internal hardware watchdog monitors the PROFIBUS ASIC’s communication state. If the ASIC fails to complete a bus cycle within a configurable timeout window, the watchdog asserts a fault signal to the AC500 CPU via the S-Bus, triggering a diagnostic event that the application program can read via standard IEC 61131-3 function blocks. This mechanism prevents silent data corruption — a scenario where a failed communication module continues to supply stale process data to the CPU without raising an alarm.

Backplane S-Bus Interface: Data exchange between the CM592-DP and the AC500 CPU occurs over the proprietary S-Bus, a synchronous serial bus embedded in the AC500 terminal base. The S-Bus operates at a fixed internal clock rate, decoupled from the PROFIBUS baud rate. This means the CPU’s process image update rate for PROFIBUS I/O data is governed by the AC500 task cycle configuration, not by the PROFIBUS bus cycle time — allowing engineers to configure fast CPU tasks that read PROFIBUS data at a rate faster than the PROFIBUS cycle itself, using the last-valid-value buffering in the CM592-DP’s dual-port RAM.

System Integration Benefits

• Zero-Gateway Architecture: The CM592-DP plugs directly into the AC500 CPU terminal base, eliminating the need for an external PROFIBUS master gateway, reducing panel footprint, wiring complexity, and potential single points of failure introduced by standalone gateway hardware.
• Dual-Role Flexibility: A single hardware SKU covers both DP Master and DP Slave roles, configured entirely in software via ABB Automation Builder. This allows the same spare part to be deployed in either a master controller station or a subordinate slave station, simplifying spare parts inventory management for maintenance teams.
• Deterministic I/O Update Latency: In DP Master mode, the CM592-DP executes a fixed-cycle PROFIBUS bus scan. The bus cycle time is deterministic and calculable based on slave count, data volume, and baud rate — enabling engineers to guarantee worst-case I/O latency figures required for process control loop tuning and safety function response time calculations.
• Isochronous Mode Support: For motion control and high-precision process applications, the CM592-DP supports PROFIBUS-DP isochronous mode (with compatible AC500 CPU firmware), synchronizing the PROFIBUS bus cycle to the AC500 task clock. This reduces jitter in I/O data delivery to sub-millisecond levels, meeting the timing requirements of coordinated multi-axis positioning systems.
• Comprehensive Diagnostic Transparency: The module surfaces PROFIBUS-DP diagnostic data — including slave station status, bus fault codes, and cyclic error counters — directly into the AC500 process image. Application programs can read these diagnostics via standard IEC 61131-3 function blocks without requiring proprietary diagnostic tools, enabling in-application fault logging and HMI alarm integration.
• Interoperability with Third-Party PROFIBUS Devices: As a DP Master, the CM592-DP uses standard GSD (General Station Description) files for slave configuration, ensuring compatibility with any PROFIBUS-DP certified device regardless of manufacturer — including Siemens ET 200 distributed I/O, ABB drives, Pepperl+Fuchs barriers, and Phoenix Contact I/O modules.
• Slave Mode for DCS Integration: When configured as a DP Slave, the CM592-DP allows the AC500 to appear as a standard PROFIBUS-DP slave to any third-party DP Master — including Siemens S7-300/400/1500, Schneider Modicon, or Yokogawa DCS systems — enabling seamless integration of AC500-based subsystems into existing plant-wide PROFIBUS networks without protocol conversion hardware.
• Scalable Network Topology: Two CM592-DP modules can be installed simultaneously in a single AC500 CPU station (occupying both left-side communication slots), creating two independent PROFIBUS-DP networks from one CPU. This supports architectures where safety-related and standard I/O networks must be physically separated, or where network segmentation is required to manage bus load across large slave populations.
• Long-Term Installed Base Compatibility: PROFIBUS-DP is deployed in an estimated 60 million installed nodes globally. The CM592-DP ensures that AC500-based control systems can interface with this installed base without requiring network migration, protecting capital investment in existing field instrumentation and distributed I/O infrastructure.

Quality Assurance & Global Logistics

Every ABB CM592-DP 1SAP173200R0001 unit dispatched from our Xiamen, China facility is sourced through verified industrial distribution channels with full supply chain traceability. Pre-shipment inspection covers visual integrity of the module housing, label authenticity verification against ABB documentation, connector pin condition check, and anti-static packaging with humidity indicator card. Batch traceability records are retained for a minimum of three years.

Shipments originate from Xiamen, China — a major international logistics hub with direct access to air freight services via Xiamen Gaoqi International Airport and sea freight via Xiamen Port. Standard international delivery options include DHL Express (3–5 business days to most destinations), FedEx International Priority, and UPS Worldwide Express. For project orders requiring DDP (Delivered Duty Paid) terms, customs documentation support including commercial invoice, packing list, and certificate of origin is provided as standard. Emergency same-day dispatch is available for orders confirmed before 16:00 CST on business days.

All units carry a 12-month warranty from the date of dispatch, covering manufacturing defects and confirmed functional failures under normal operating conditions. Warranty claims are processed with a target response time of 48 hours from receipt of the defective unit.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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