SINAMICS Communication & Option Module Compatibility

Compatibility Overview

Siemens SINAMICS drives are engineered with a modular architecture that separates the physical Power Module (PM) from the Control Unit (CU) processor. This design allows engineers to select the exact processor performance, safety integrated standard, and communication capability required for an automation system. Fieldbus integration is primarily executed through the communication interfaces integrated directly on the Control Unit board or expanded via specialized hardware option boards.

Ensuring hardware compatibility across the SINAMICS ecosystem is a critical phase of system design and procurement. Using incompatible module configurations or running mismatched firmware versions will prevent your automation network from initializing, creating communication blockages. This technical guide outlines compatible pairings, hardware constraints, firmware limits, and protocol configuration notes for SINAMICS G120, S120, G120C, and V20 system architectures.

Supported Models

A key engineering distinction in the SINAMICS portfolio is whether a Control Unit contains fixed, integrated fieldbus ports or depends on dedicated option slots to handle card interfaces. The following matrix outlines the compatibility profiles across the primary SINAMICS modular families:

The G120 series relies specifically on selecting the correct "E" (Essential) or "S" (Standard/Superior) Control Unit. For example, a CU240E-2 PN can switch software stacks to speak Modbus TCP or EtherNet/IP via direct configuration adjustments, but it cannot mechanically accept a physical PROFIBUS or CANopen option card if a system-wide network transition is executed later.

Unsupported Models

Certain hardware designs prevent option module expansion. The entry-level SINAMICS V20 drive (e.g., 6SL3210-5BE22-2UV0) is manufactured exclusively with an RS485 terminal connection that communicates via USS or Modbus RTU protocols. The physical frame lacks expansion backplanes; consequently, you cannot run native PROFINET, EtherNet/IP, or PROFIBUS interfaces on the V20 without using external third-party communication gateways.

Furthermore, cross-family modular combinations are unsupported and electrically hazardous. The CBE20 Communication Board (6SL3055-0AA00-2EB0), designed for high-performance S120 CU320-2 modules, cannot be installed on a G120 CU240E-2 or CU250S-2. The G120 series does not possess the high-frequency internal backplane bus interface necessary to power and communicate with multi-port high-speed Ethernet boards. Legacy drives like the standard SINAMICS G110 are also entirely incompatible with current industrial Ethernet option modules due to legacy firmware structures.

Communication Options

When designing networked drive networks, several key option boards and modules can expand the physical network capabilities of SINAMICS drives:

• CBE20 Ethernet Option Board (6SL3055-0AA00-2EB0): Fits into the option slot of the SINAMICS S120 CU320-2. This board adds four RJ45 switched Ethernet ports. It supports PROFINET IO with Isochronous Real-Time (IRT), EtherNet/IP, or Modbus TCP. Firmware controls on the S120 allow the CBE20 to operate split-network diagnostics while running real-time control.
• CBC10 CANopen Board (6SL3055-0AA00-2CA0): Installs inside the option slot of S120 Control Units to integrate the drive system directly into CANopen fieldbus architectures. This board enables compatibility with DS301 profile structures.
• TB30 Terminal Board (6SL3055-0AA00-2TA0): While primarily used to expand analog and digital inputs, it mounts inside the option slot of the CU320-2, serving as a co-processor board for diagnostic integration.
• BOP-2 & IOP-2 Handheld Interfaces: While not standard fieldbus modules, these local operation panels plug into the front of G120 Control Units, serving as critical diagnostic hubs to parameterize and configure fieldbus options like IP addressing and fieldbus protocol mapping.

Integration Notes

Integrating SINAMICS communication modules into automated control environments requires careful parameter tuning and configuration files:

• Industrial Protocol Switching: On dual-protocol Control Units (like G120C and CU240E-2 PN), swapping from PROFINET to EtherNet/IP is managed via parameter p2030 (Fieldbus protocol selection). You must select value 10 for EtherNet/IP or 1 for PROFINET, followed by a RAM-to-ROM configuration save and a complete physical power cycle of the Control Unit.
• Engineering Files (GSDML & EDS): For master controllers inside TIA Portal, SINAMICS drives are catalog native. In third-party architectures (such as Rockwell Automation ControlLogix), developers must import the matching Electronic Data Sheet (EDS) file to map the Common Industrial Protocol (CIP) commands. For PROFINET masters (like Beckhoff or Omron), the matching GSDML schema file must match the physical drive family and firmware level.
• Firmware Requirements: Dual-protocol EtherNet/IP capability on G120 Control Units requires at least Firmware version v4.7 or higher. On S120 CU320-2 control units, native EtherNet/IP over the standard system PROFINET ports requires firmware v4.5 or newer, while CBE20 operation requires at least firmware v4.8 to support current ODVA compliance.

Common Compatibility Issues

1. RAM-to-ROM Storage Failure: Changing configuration parameters such as drive IP address mapping, subnet masking, or protocol flags (p2030) will run successfully until the drive is powered down. If parameter p0971 is not set to 1 to command a RAM-to-ROM write, all network adjustments revert on the next power cycle.
2. CBE20 Switch Mappings: If cyclic connection timeouts occur while utilizing the CBE20 inside S120 processors, review switch settings. The CBE20 is configured via parameter allocation (p0880). Ensure that hardware ports are configured consistently if running Device Level Ring (DLR) structures.
3. Physical Interference on Cabinet Mounts: Installing option cards such as standard encoder interface modules (SMC30, TM31) to the side of a G120 CU250S-2 increases the overall physical depth of the Control Unit frame. If mounting inside thin-profile electrical doors, ensure physical layout clearings are cross-checked before site integration.

FAQ

Q: Can I run a CBE20 option board on a SINAMICS G120 CU240E-2 control unit?

A: No. The CBE20 is designed specifically for the S120 CU320-2 control unit option slot. It cannot be mechanically or electrically interfaced with G120 series control units, which feature fixed native communication interfaces.

Q: What parameter switches a SINAMICS G120C PN drive from PROFINET to EtherNet/IP mode?

A: Set parameter p2030 to a value of 10. Once changed, execution requires saving the parameters to ROM (setting p0971 = 1) and cycling the drive's 24V supply to initialize the new industrial Ethernet stack.

Q: Can I run PROFINET and Modbus TCP simultaneously through a single G120 CU250S-2 PN control unit?

A: No. The internal Ethernet processor stack operates sequentially. You can select only one fieldbus protocol to run cycle operations at any time via parameter p2030 settings.

Q: What diagnostic tool is recommended for confirming the active communication status of a SINAMICS drive?

A: You can use a BOP-2 or IOP-2 local keypad interface to check diagnostic parameter r2050 or r2060 (Connector inputs to fieldbus), or connect directly using the Siemens Startdrive engineering software within TIA Portal to confirm active network status flags and cycle integrity.

Q: Does the SINAMICS V20 drive support communication option boards?

A: No. The V20 is designed exclusively for Basic Performance applications and does not have an option board slot. It has built-in RS485 terminals for Modbus RTU or USS, requiring an external interface gateway node if ethernet communication is required.