Communication Protocols and Module Configuration of Siemens 3WL1116/3WL1216 1600A ETU45B-G-LCD-3P

Communication Protocols and Module Configuration of Siemens 3WL1116/3WL1216 1600A ETU45B-G-LCD-3P

1. Core Communication Protocols and Module Types

The communication function of this circuit breaker model is implemented via optional communication modules, supporting two mainstream industrial protocols, as detailed below:

1. Protocol Functions and Application Scenarios
2. PROFIBUS DP (COM15 Module)

Supports DPV1 functions (diagnosis, alarm, parameterization), facilitating integration into upper-level systems such as Siemens TIA Portal.

Transmissible data: attuale, voltaggio, power, switch status, trip cause, fault records, ecc.

Typical applications: industrial automation production lines, large-scale factory power distribution systems, seamless connection with S7 series PLCs.

2. MODBUS RTU (COM16 Module)

Adopts standard Modbus RTU frame format, supporting commonly used function codes such as 03 (Read Holding Registers), 06 (Preset Single Register) E 10 (Preset Multiple Registers).

Enables remote opening/closing, protection parameter setting, and energy data acquisition.

Typical applications: building automation, infrastructure projects, compatible with third-party SCADA systems.

III. Integration of Communication and Measurement Functions

Plus Measurement Function (optional): Cooperates with communication modules to achieve high-precision energy management, with measurement accuracy as follows:

Current: ±1%

Voltage: ±1.5%

Energia: ±2%

Data Logging Capability: Can store 100 fault records (trip type, time, current value), supporting fault tracing and system diagnosis.

Remote Control: Realizes remote opening/closing and parameter modification through communication module + electric operating mechanism, without on-site operation.

1. Configuration and Selection Notes
2. Communication modules are optional accessories: The basic model does not include communication functions; COM15 or COM16 modules need to be ordered separately.
3. Compatibilità del protocollo: Select the protocol according to the upper monitoring system (PROFIBUS DP is suitable for Siemens systems, while MODBUS RTU is suitable for third-party systems).
4. Wiring requirements:

PROFIBUS DP: Use shielded twisted pair cables; the bus length is related to the transmission rate (maximum length of 100m at 12 Mbps).

MODBUS RTU: Adopt RS485 bus, supporting up to 32 connected devices, with a maximum bus length of 1200m (at 9.6 kbps).

4. ETU45B-G-LCD Support: The electronic trip unit has a built-in communication interface, allowing direct installation of COM15/COM16 modules without additional hardware.
5. Upgrade and Replacement Solution

The Siemens 3WL series has been gradually upgraded to the 3WA series (per esempio., 3WA1116-3EG45-4GA4). In addition to retaining PROFIBUS DP and MODBUS RTU, it has added an Ethernet communication module (supporting PROFINET and EtherNet/IP), making it more suitable for Industry 4.0 and Internet of Things applications.