Siemens C98043 Modules – C98043-A1240-L

Technical Dossier

Product Details And Specifications

Siemens C98043 Series Technical Notes

The Siemens C98043 series represents a core family of drive control and interface modules deployed across the SIMOREG DC Master and SIMOVERT drive platforms. These modules are embedded in critical continuous-process industries including petrochemical refineries, nuclear power auxiliary systems, steel rolling mills, cement plants, and offshore platform drive systems. The C98043 designation covers a broad range of functional boards — from firing pulse boards and current regulators to field supply controllers and serial interface adapters — making it one of the most referenced spare parts families in Siemens DC drive maintenance catalogs globally. Installed base across legacy SIMOREG 6RA24, 6RA26, 6RA27, and 6RA70 platforms ensures sustained demand for C98043 modules well into the 2030s.

The Evolution of C98043 Architecture

The C98043 board family was introduced alongside the SIMOREG 6RA24 and 6RA26 series in the late 1980s as modular plug-in control electronics for thyristor-based DC drives. Early revisions used discrete analog circuitry for current and speed regulation. By the mid-1990s, the architecture transitioned to hybrid analog-digital designs with onboard microcontrollers, reflected in sub-series such as the A1200, A1240, and A1680 variants. The introduction of the SIMOREG DC Master 6RA70 in the late 1990s brought a parallel C98043 board generation with enhanced serial communication capability (USS/PROFIBUS) and expanded diagnostic registers. Compatibility between early and late C98043 revisions is board-specific: mechanical form factor is largely consistent, but firmware and connector pinouts differ between A-suffix generations. Engineers performing like-for-like replacements must verify the full part number including letter suffix (e.g., -L, -L1, -L2) to ensure functional equivalence.

C98043 Full Catalog & Functionalities (SKU List)

The following SKUs represent confirmed members of the Siemens C98043 series, classified by functional role:

Control & Regulation Boards

• C98043-A1240-L: Main control board for SIMOREG DC drive; speed/current dual-loop regulation.
• C98043-A1240-L1: Revised control board variant with updated firmware register map.
• C98043-A1240-L2: Enhanced control board with extended diagnostic output capability.
• C98043-A1200-L: Base-generation control module for 6RA24/6RA26 platforms.
• C98043-A1200-L1: Updated revision of A1200 control board; improved EMC filtering.

Firing Pulse & Thyristor Interface Boards

• C98043-A1680-L: Firing pulse board for 6-pulse thyristor bridge; synchronization and gate drive.
• C98043-A1680-L1: Revised firing pulse board with enhanced isolation on gate outputs.
• C98043-A1682-L: 12-pulse firing pulse board for high-power DC drive configurations.
• C98043-A1690-L: Firing pulse interface board for extended current range drives.

Field Supply & Excitation Boards

• C98043-A1600-L: Field supply control board; regulates DC motor field excitation current.
• C98043-A1600-L1: Updated field supply board with improved current sensing accuracy.
• C98043-A1602-L: Dual-channel field supply board for motors with separate field windings.

Communication & Interface Adapters

• C98043-A1710-L: Serial interface board; USS protocol adapter for SIMOREG drives.
• C98043-A1710-L1: Updated serial interface board with PROFIBUS DP support.
• C98043-A1720-L: Parallel interface board for legacy PLC I/O integration.

Power Supply Boards

• C98043-A1300-L: Internal SMPS board; generates logic supply voltages for control electronics.
• C98043-A1300-L1: Revised power supply board with improved short-circuit protection.