Siemens 6SL3040-1MA00-0AA0 CU320-2 DP Upgrade Solution

Product Overview

Siemens 6SL3040-1MA00-0AA0 CU320-2 DP Upgrade Solution: Seamless Transition from Legacy SINAMICS S120 Systems

The Siemens 6SL3040-1MA00-0AA0 is the CU320-2 DP Control Unit for the SINAMICS S120 drive system, communicating via PROFIBUS DP. As legacy S120 installations age and original CU320 (first-generation) units reach end-of-life, plant engineers and procurement teams face increasing pressure to source verified replacements or execute a structured upgrade path. TOPNLMS stocks the 6SL3040-1MA00-0AA0 as a direct replacement and supports customers through every stage of the migration — from pre-shipment inspection to on-site commissioning guidance.

The CU320-2 DP is the successor to the original CU320 control unit. It retains full backward compatibility with the S120 booksize and chassis power module family, including the ALM (Active Line Module) and SLM (Smart Line Module) configurations. Existing wiring to the Terminal Module TM31 and Terminal Module TM15 for digital and analog I/O expansion remains pin-compatible, eliminating the need for rewiring in most retrofit scenarios. The 24 VDC auxiliary power supply connection is unchanged, and the unit draws from the same DRIVE-CLiQ backbone used across the S120 platform.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful migration from a legacy CU320 to the 6SL3040-1MA00-0AA0 CU320-2 DP rarely involves the control unit alone. In practice, the upgrade touches several interconnected components within the S120 drive cabinet. The DRIVE-CLiQ Hub Module DMC20 is frequently required when the existing DRIVE-CLiQ ring topology needs to be extended or reconfigured after the control unit swap. If the installation uses a Sensor Module Cabinet SMC30 for encoder feedback from motors, its DRIVE-CLiQ connection to the new CU320-2 DP is plug-compatible, preserving existing motor feedback wiring.

For sites running mixed servo and vector drive axes, the Motor Module booksize units — such as the 6SL3120 series — continue to operate without hardware changes; only the drive object parameterization in STARTER or TIA Portal requires updating to reflect the new firmware baseline. The CompactFlash card 6SL3054-0EG01-1BA0 must be ordered separately and loaded with the correct SINAMICS firmware image before the CU320-2 DP is powered up for the first time.

Where the legacy system used a CBC10 Communication Board for CANopen connectivity alongside PROFIBUS, the CU320-2 DP’s option board slot remains compatible, allowing the existing CBC10 to be transferred directly. Sites that have already migrated their supervisory layer to PROFINET should note that the CU320-2 DP variant covered here is the PROFIBUS version; the PROFINET equivalent is the CU320-2 PN (6SL3040-1LA00-0AA0), which TOPNLMS also stocks for parallel upgrade projects.

Panel builders replacing the control unit within an existing SINAMICS S120 Cabinet Module will find that the CU320-2 DP occupies the same DIN-rail slot and uses the same front-panel connector layout, minimizing cabinet rework. The Basic Operator Panel BOP20 used for local parameter access and fault acknowledgment connects to the same interface port and requires no adaptation.

Retrofit Guidance FAQ

Q: Can I reuse my existing PROFIBUS cable and DP address settings?
A: Yes. The CU320-2 DP uses the same 9-pin Sub-D PROFIBUS connector and supports the same DP address range (1–125). Your existing GSD file and PLC configuration in SIMATIC S7 or S7-1500 remain valid without modification.

Q: Do I need to re-enter all drive parameters after swapping the control unit?
A: A parameter backup using STARTER (via the project file) or TIA Portal’s drive commissioning wizard is strongly recommended before removal. After installing the 6SL3040-1MA00-0AA0 and loading the correct firmware onto the CompactFlash card, parameters can be restored via the upload function. Axis-specific data such as encoder pulse counts, current limits, and ramp times are preserved in the backup.

Q: Is the wiring to Terminal Modules (TM31, TM15) affected?
A: No. Terminal Modules connect via DRIVE-CLiQ and retain their existing wiring to field devices. The DRIVE-CLiQ cable from the TM31 or TM15 plugs directly into the CU320-2 DP without modification.

Q: What is the physical installation clearance requirement?
A: The CU320-2 DP has the same booksize form factor as the original CU320. No additional cabinet space is required. Ensure the 24 VDC supply rail can deliver the rated auxiliary current (typically 0.8 A) before powering up.

Q: Can the CU320-2 DP control both servo and vector drive axes simultaneously?
A: Yes. The CU320-2 DP supports mixed drive object configurations — servo control objects (SCO) and vector control objects (VCO) can coexist on the same control unit, subject to the licensed axis count on the CompactFlash card.

Q: How do I handle the firmware version difference between the old and new unit?
A: The CU320-2 DP runs SINAMICS V4.x firmware, which is newer than the V2.x platform on the original CU320. After restoring parameters, run the parameter consistency check in STARTER or TIA Portal and accept any automatic adaptations. Test all safety functions (STO, SS1) before returning the drive to production.

Warranty Assurance

Every 6SL3040-1MA00-0AA0 CU320-2 DP Control Unit shipped by TOPNLMS is covered by a 12-month warranty from the date of delivery. Prior to dispatch, each unit undergoes a pre-shipment functional inspection covering power-up self-test, DRIVE-CLiQ port integrity, PROFIBUS interface verification, and firmware version confirmation. Units are packed in anti-static ESD-safe packaging with foam cushioning to prevent transit damage.

In the event of a confirmed defect within the warranty period, TOPNLMS provides a replacement unit or full refund — your choice. Our technical support team responds to warranty claims and commissioning queries within 1 business day. For urgent production-down situations, expedited air freight dispatch from Xiamen is available with same-day processing for orders confirmed before 14:00 CST.

Procurement teams can request a test report, serial number record, and packing list with each shipment for incoming quality control purposes. We support NET30 terms for qualified industrial accounts and accept T/T, L/C, and major credit cards.

Contact our drive systems team for volume pricing, cross-reference verification, or application-specific compatibility questions before placing your order.