Kollmorgen 620-AS S62001 Analog Input Assembly – S600 Series

Kollmorgen 620-AS S62001 Analog Input Assembly: Signal Acquisition Architecture Within the S600 Servo Control Loop

The Kollmorgen 620-AS (S62001) is a plug-in analog input expansion assembly engineered specifically for the S600 series servo drive platform. Its primary function within a closed-loop motion control architecture is to digitize external analog reference signals — including ±10 V velocity/torque command inputs, 4–20 mA process feedback, and potentiometer-derived position references — and present them to the S600 drive’s DSP control core within the same deterministic scan cycle. This eliminates the latency and signal degradation introduced by external signal conditioning hardware, preserving loop bandwidth and phase margin in high-performance servo applications.

Unlike generic analog-to-digital converter boards, the 620-AS is firmware-aware: it synchronizes its sampling clock to the S600 drive’s internal PWM and control interrupt cycle, ensuring that analog data is coherent with the drive’s current and velocity loop execution. This synchronization is critical in multi-axis gantry and coordinated motion applications where analog cross-coupling between axes must be minimized.

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Technical Parameters

Hardware Logical Analysis

The 620-AS assembly addresses a specific architectural constraint of the S600 platform: the base drive unit provides a limited number of onboard analog input channels, which are insufficient for applications requiring simultaneous acquisition of multiple analog references (e.g., external velocity command + torque limit override + process feedback). The 620-AS expands this capacity through the drive’s dedicated expansion slot, which provides both power and a high-speed parallel data bus to the host DSP.

Differential Input Architecture and EMC Immunity: The module employs a differential input topology on all analog channels. In industrial environments where servo drives share enclosures with variable-frequency drives, contactors, and high-current bus bars, common-mode noise voltages of several volts are routine. The differential architecture rejects this common-mode interference, preserving signal integrity at the ADC input stage. The common-mode rejection ratio (CMRR) of the input stage is sufficient to maintain ADC accuracy even in the presence of 50/60 Hz ground-loop noise — a practical requirement in multi-machine cells where ground potential differences between control cabinets are non-negligible.

Sampling Coherence and Control Loop Integrity: The 620-AS does not operate as an asynchronous peripheral. Its ADC conversion is triggered by the S600 drive’s control interrupt, which is phase-locked to the PWM carrier frequency. This means analog samples are always acquired at a fixed, known phase relationship to the drive’s current and velocity loop execution. In applications using analog feedforward — for example, a master encoder velocity signal fed as an analog reference to a follower axis — this coherence prevents the feedforward term from introducing phase error into the velocity loop, which would manifest as tracking error at the mechanical output.

Expansion Slot Bus Protocol: The S600 expansion slot uses a proprietary parallel bus with handshaking logic. The 620-AS implements the full bus protocol, including slot-identification registers that allow the S600 firmware to auto-detect the module type at power-up and configure the appropriate signal scaling and channel mapping without manual parameter entry. This reduces commissioning time and eliminates the risk of misconfiguration in multi-module expansion scenarios.

ESD and Overvoltage Protection: Input terminals incorporate transient voltage suppression (TVS) diodes rated for the expected overvoltage transients in industrial wiring environments. This protects the ADC front-end from damage caused by cable capacitance discharge during hot-plugging of field transducers — a common failure mode in maintenance scenarios where technicians connect or disconnect signal wiring with the drive powered.

System Integration Benefits

• Eliminates External Signal Conditioning Hardware: Analog signals from field transducers connect directly to the 620-AS terminal interface. No separate signal conditioner, isolation amplifier, or DIN-rail ADC module is required, reducing panel component count and potential failure points in the signal chain.
• Deterministic Real-Time Response: ADC sampling is synchronized to the drive control cycle. Analog reference updates are available to the velocity and torque loops within the same execution frame, maintaining loop bandwidth without introducing additional transport delay.
• Reduced Panel Wiring Complexity: The plug-in form factor eliminates the inter-device wiring between an external ADC and the drive’s digital I/O interface. Fewer terminal connections directly reduce the probability of wiring faults and simplify panel documentation.
• Diagnostic Transparency: The S600 firmware can read the 620-AS channel values as drive parameters, making analog input states visible through the drive’s commissioning software (DriveGUI / WorkBench). This allows technicians to verify signal levels without oscilloscopes or external measurement equipment during commissioning and fault diagnosis.
• Multi-Axis Scalability: In multi-axis systems where each S600 drive requires an independent analog reference channel, the 620-AS provides a consistent, repeatable hardware configuration across all axes, simplifying spare-parts management and reducing the risk of configuration drift between axes.
• Firmware-Managed Channel Scaling: Input scaling (gain, offset, deadband) is managed through S600 drive parameters rather than hardware potentiometers or jumpers. This allows scaling adjustments to be made through the commissioning software and stored in the drive’s non-volatile parameter set, ensuring repeatability after drive replacement.
• Compatibility with Legacy S600 Infrastructure: The 620-AS is designed for the S600 platform, which remains in active use across a large installed base of CNC, packaging, and printing machinery. Availability of this module directly extends the operational life of existing S600-based machines without requiring drive platform migration.
• Reduced Commissioning Time: Auto-detection of the module type at power-up, combined with firmware-managed scaling, reduces the commissioning steps required compared to external ADC solutions that require separate configuration and wiring verification procedures.

Quality Assurance & Global Logistics

Each Kollmorgen 620-AS S62001 unit dispatched from our Xiamen, China facility undergoes a structured pre-shipment verification process. Visual inspection confirms label authenticity, PCB condition, and connector integrity. Functional continuity checks verify that the expansion slot interface pins meet the impedance and continuity specifications required for correct S600 bus communication. Units sourced from OEM surplus channels are cross-referenced against Kollmorgen part number databases to confirm authenticity before acceptance into stock.

Packaging follows anti-static ESD protocols: each unit is sealed in a conductive poly bag with desiccant, placed in foam-lined cartons rated for international air and sea freight handling. Moisture barrier packaging is applied for shipments to high-humidity destinations. Lot and serial number documentation is retained and available on request for traceability requirements.

From Xiamen, we ship globally via DHL Express, FedEx International Priority, and UPS Worldwide Expedited. Standard transit times are 3–5 business days to Europe and North America, 2–4 business days to Southeast Asia and Japan. Customs documentation — including commercial invoice, packing list, and certificate of origin — is prepared to HS Code 8537.10 standards to minimize customs clearance delays. For orders requiring a Certificate of Conformance or inspection report, documentation is prepared and included with the shipment.

A 12-month functional warranty covers all units from the date of shipment. Warranty claims are processed through direct technical assessment: the unit is returned to Xiamen, inspected, and either repaired or replaced at no charge if the failure is determined to be a manufacturing or component defect. Expedited replacement units can be dispatched prior to return receipt for customers with documented production-critical requirements.

Contact Information

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