Siemens SINAMICS S120 Function Manual page 858

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Communication

11.4 Communication via MODBUS TCP

General information about communication

Communication with Modbus TCP runs via the Ethernet/PROFINET interfaces:

For Modbus TCP with a CU320-2 PN or CU310-2 PN.

For Modbus TCP with a CU320-2 PN or a CU320-2 DP via a CBE20.

Precisely one Modbus connection can be established. Simultaneous connection via the

interfaces X150 and X1400 is not possible and is acknowledged with alarm A08555(1).

However, you can use one interface for Modbus TCP, and the other as PROFINET interface.

Drive object that can be addressed via Modbus

With Modbus TCP, you always address the first control-drive object from the list of drive

objects (p0978[0]). A servo or vector drive object must be in this parameter.

● However, Modbus TCP is only activated if, under p0978[0], there is a drive object that is

supported by Modbus TCP.

● If p0978[0] does not contain a valid drive object, then establishing communication is

acknowledged with alarm A08555(2).

Diagnostics LEDs in Modbus TCP

Diagnostics states are shown as follows using LEDs with Modbus TCP:

● X150: "PN" LED

● X1400 (CBE20): "OPT" LED

The following states can be displayed by these LEDs:

Significance

Connections and setpoints are OK.

Flashing light

Connection is OK, but no setpoints (dependent on timeout).

Flashing light

No connection or setpoint timeout.

Function Manual, 11/2017, 6SL3097-4AB00-0BP5

Drive functions

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