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2 Solution

Solution

2.1

Schematic layout

The figure below shows a schematic overview of the most important components of

the solution:

Figure 2-1

Configuration

A SIMATIC S7-1200 CPU with firmware V4.2.1 is used as the controller.

It exchanges the motor data with up to 32 ebm-papst fans sequentially using the

serial communication board CB 1241 RS485 via the Modbus RTU data protocol.

To operate and monitor the motor data, a SIMATIC HMI KTP900 BASIC (or its

simulation in the TIA Portal) is used.

Configuration is performed with STEP 7 V15.

Note

Instead of the CB 1241 RS485, the CM 1241 RS422/485 with 9-pin D-sub

connector (6ES7241-1CH32-0XB0) may be used alternatively (\3\).

However, the CB 1241 RS485 is better suited for direct wiring of the fan (without

D-sub connector).

Controlling several fans (ebm-papst) via Modbus RTU

Entry ID: 109476801,

V2.0,

SIMATIC

S7-1200

PROFINET IE

CB 1241

RS485

MODBUS RTU

09/2018

SIMATIC HMI

KTP900 BASIC

ebm-papst

Modbus fans