SIEMENS SIMOREG C98043-A1242-L1 Modules

Technical Dossier

Product Details And Specifications

SIEMENS SIMOREG Series Technical Notes

The SIEMENS SIMOREG DC Master series represents one of the most widely deployed DC drive control platforms in global heavy industry. Installed across petrochemical refineries, nuclear power auxiliary systems, steel rolling mills, paper processing lines, and large-scale chemical plants, the SIMOREG platform has served as the backbone of variable-speed DC motor control for decades. The C98043 board family — including the C98043-A1242-L1 spindle control board — is a core component within the SIMOREG 6RA70 and legacy 6RA24/6RA26 drive families, providing closed-loop armature current regulation, field weakening control, and spindle orientation logic for CNC and heavy-duty machine tool applications.

The Evolution of SIMOREG Architecture

The SIMOREG product line originated in the early 1980s as SIEMENS transitioned from analog thyristor controllers to digitally supervised DC drive platforms. The first generation — the 6RA24 and 6RA26 series — used discrete analog circuitry with limited parameterization capability. By the early 1990s, SIEMENS introduced the 6RA70 SIMOREG DC Master, which replaced analog control boards with microprocessor-based modules communicating over an internal CUD (Control Unit Drive) bus. This architecture allowed full digital parameterization via the PMU operator panel or PROFIBUS-DP interface.

The C98043 board family was introduced as part of the 6RA70 generation, providing modular plug-in expansion for technology functions including spindle control (C98043-A1242), encoder evaluation (C98043-A1680), and serial communications (C98043-A1690). Compatibility between board revisions (L1, L2, L3) is generally maintained within the same drive frame size, but firmware version alignment must be verified before substitution. The 6RA70 series reached end-of-production status; SIEMENS now positions the SINAMICS DCM (6RA80) as the direct successor, offering backward-compatible parameter migration tools.

SIMOREG Full Catalog & Functionalities (SKU List)

The following SKUs represent verified components within the SIMOREG C98043 board family and the broader 6RA70 ecosystem. Each entry reflects a distinct functional role within the drive system.

C98043-A1242-L1: Spindle technology board for CNC axis orientation and M19 spindle stop control.
C98043-A1242-L2: Revised spindle board with extended encoder input range and improved EMC filtering.
C98043-A1242-L3: Latest spindle board revision; supports higher-resolution encoders up to 2048 PPR.
C98043-A1680-L1: Encoder evaluation board; supports HTL/TTL incremental encoders for speed feedback.
C98043-A1680-L2: Encoder board revision with dual-channel input for tandem motor configurations.
C98043-A1690-L1: Serial interface board; provides RS-232/RS-485 communication for legacy SCADA integration.
C98043-A1690-L2: Enhanced serial board with USS protocol support and extended baud rate range.
C98043-A1600-L1: Basic technology board for standard closed-loop speed control expansion.
C98043-A1600-L2: Technology board revision with additional analog I/O channels.
C98043-A7002-L1: CUD1 main control unit for 6RA70 drives; central microprocessor and parameter storage.
C98043-A7002-L2: CUD1 revision with expanded EEPROM and improved watchdog circuit.
C98043-A7004-L1: CUD2 supplementary control board for extended I/O and dual-axis coordination.
C98043-A1220-L1: Pulse encoder interface board for high-accuracy speed measurement in rolling mill drives.
C98043-A1220-L2: Revised pulse encoder board with differential input protection.
C98043-A1260-L1: Field current regulation board for separately excited DC motor field winding control.
C98043-A1260-L2: Field regulation board revision with auto-tuning field weakening algorithm.
C98043-A1300-L1: Analog I/O expansion board; adds 4 analog inputs and 2 analog outputs to the drive.
C98043-A1310-L1: Digital I/O expansion board; provides 8 additional binary inputs and 4 relay outputs.

Sourcing Hard-to-Find & Obsolete SIMOREG Parts

The SIMOREG 6RA70 series has been officially discontinued by SIEMENS, with standard spare parts support transitioning to RFQ availability review through authorized service channels. For operators running installed base equipment in refineries, power generation facilities, or continuous process plants where drive replacement is not operationally feasible, DriveKNMS maintains a dedicated inventory of C98043 series boards sourced from decommissioned equipment, factory overstock, and verified third-party channels.

All obsolete boards are catalogued by part number, revision level, and firmware compatibility. DriveKNMS provides cross-reference support to identify equivalent revision substitutes where the original revision is no longer available. For critical applications, we recommend maintaining a minimum of one spare CUD1 board (C98043-A7002) and one technology board per installed drive to ensure continuity of operations without dependency on spot market availability.

Quality Control for the SIMOREG Range

SIMOREG C98043 boards incorporate multi-layer PCB construction with surface-mount components and proprietary SIEMENS ASICs that require specialized test procedures. DriveKNMS applies the following verification protocol to all boards prior to dispatch: