Siemens SIMADYN D Modules – 6DD1683-0CC0 Power Supply Module

Technical Dossier

Product Details And Specifications

Siemens SIMADYN D Series Technical Notes

The Siemens SIMADYN D is a modular, rack-based digital control system developed by Siemens AG for high-demand industrial process control applications. It has been deployed extensively across global heavy industry sectors including petrochemical refineries, nuclear power generation facilities, steel rolling mills, cement plants, and offshore oil & gas platforms. The system's architecture is based on a parallel backplane bus structure that supports deterministic real-time processing, making it a reference platform for closed-loop drive control and coordinated multi-axis regulation. SIMADYN D installations remain operational in critical infrastructure worldwide, with many sites maintaining active spare parts programs to extend system life beyond the manufacturer's standard support window.

The Evolution of SIMADYN D Architecture

SIMADYN D was introduced in the mid-1980s as the successor to Siemens' analog SIMADYN C platform, transitioning process control logic from hardware-wired analog circuits to software-configurable digital modules. The system uses a proprietary CS (Control System) bus for inter-module communication and a separate I/O bus for field signal acquisition. Early hardware generations used CMOS-based processor cards with clock speeds under 10 MHz; later revisions incorporated faster DSP-class processors capable of sub-millisecond cycle times for drive regulation tasks.

The system was designed for compatibility across hardware generations within the same rack chassis, allowing incremental module replacement without full system redesign. However, firmware dependencies between CPU modules (6DD16xx series) and I/O modules (6DD17xx series) require careful version matching during maintenance. As Siemens transitioned its control portfolio toward SIMATIC PCS 7 and SINAMICS drive platforms through the 2000s and 2010s, SIMADYN D entered a managed phase-out, with official Siemens support for most modules ending between 2010 and 2020. Migration paths to SIMATIC S7-400 and SINAMICS S120 are documented in Siemens application notes, but the capital cost and process risk of full migration means a large installed base continues to operate on original SIMADYN D hardware.

SIMADYN D Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced modules within the SIMADYN D platform. Modules are classified by functional category.

Power Supply Modules

• 6DD1683-0CC0: 24 VDC rack power supply module, provides regulated bus voltage to SIMADYN D backplane, supports hot-swap in redundant configurations.
• 6DD1683-0BB0: 24 VDC power supply module, earlier revision with lower output current rating, compatible with standard 9-slot and 18-slot racks.
• 6DD1683-0AA0: Base-generation power supply for SIMADYN D, single-rail output, non-redundant configuration.

CPU / Processor Modules

• 6DD1600-0AE0: Central processing module (PM5), 80186-based, executes CFC control programs, interfaces to CS bus.
• 6DD1600-0AF0: PM5 processor module, enhanced clock speed variant, backward-compatible with 6DD1600-0AE0 firmware base.
• 6DD1606-0AA0: PM6 processor module, DSP-based, supports fast closed-loop drive control cycles down to 1 ms.
• 6DD1606-0AB0: PM6 enhanced variant, increased SRAM capacity for larger CFC program storage.
• 6DD1607-0AA0: PM7 processor module, latest SIMADYN D CPU generation, supports PROFIBUS-DP master functionality onboard.

Digital Input Modules (DI)

• 6DD1681-0AE0: 32-channel 24 VDC digital input module, optically isolated, 1 ms input filter, compatible with standard SIMADYN D I/O bus.
• 6DD1681-0AF0: 32-channel DI module, extended temperature range variant for harsh environment enclosures.

Digital Output Modules (DO)

• 6DD1682-0AE0: 32-channel 24 VDC digital output module, transistor sourcing outputs, 0.5 A per channel, short-circuit protected.
• 6DD1682-0AF0: 32-channel DO module, relay output variant, rated for 230 VAC switching applications.

Analog Input Modules (AI)

• 6DD1661-0AA0: 8-channel analog input module, ±10 V / 0–20 mA selectable, 12-bit resolution, for process variable acquisition.
• 6DD1661-0AB0: 8-channel AI module, 14-bit resolution variant, used in precision measurement applications.

Analog Output Modules (AO)

• 6DD1662-0AA0: 8-channel analog output module, ±10 V / 4–20 mA selectable, 12-bit resolution, for setpoint transmission to field devices.

Communication / Interface Modules

• 6DD1642-0AA0: PROFIBUS-DP slave interface module, connects SIMADYN D rack to PROFIBUS network segments, supports up to 12 Mbit/s.
• 6DD1642-0AB0: PROFIBUS-DP master/slave module, allows SIMADYN D to act as network master for distributed I/O.
• 6DD1660-0AA0: CS bus coupler module, enables multi-rack SIMADYN D configurations via inter-rack CS bus extension.

Sourcing Hard-to-Find & Obsolete SIMADYN D Parts

For end-users operating SIMADYN D systems in facilities where full migration to SIMATIC or SINAMICS platforms is not feasible within the current budget cycle, DriveKNMS provides lifecycle extension support including: verified replacement modules, exchange programs for failed units, and technical cross-reference assistance for identifying compatible substitute part numbers across SIMADYN D hardware revisions.

Quality Control for the SIMADYN D Range

SIMADYN D modules present specific testing challenges due to their proprietary CS bus protocol and backplane-dependent initialization sequences. DriveKNMS applies a structured verification process for all SIMADYN D inventory:

• Visual inspection for PCB damage, capacitor condition, and connector integrity on all backplane and front-panel connectors.
• Power supply modules (6DD1683 series) are bench-tested under load to verify output voltage regulation, ripple specification, and overcurrent protection response.
• Processor modules (6DD16xx series) are powered in a reference SIMADYN D rack to confirm firmware boot sequence completion and CS bus communication handshake.
• I/O modules are channel-tested using automated signal injection to verify input threshold accuracy and output drive capability against original Siemens datasheet specifications.
• Communication modules are tested for PROFIBUS address recognition and data frame integrity at 1.5 Mbit/s and 12 Mbit/s baud rates.
• All tested units are labeled with test date, technician ID, and pass/fail result prior to packaging.