Siemens SIMATIC S7-1200 Руководство - Страница 30

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4 Installation and Commissioning

No.

Open the "User constants" register and

increase "FAN_MAX" to the maximum number

of fans to be operated. This expands the array

"fan" and therefore also the RAM usage of the

CPU project.

Note: When decreasing "FAN_MAX"

(< 4), the tag references of the HMI are also

deleted which leads to errors during

compilation!

Open the DB "Register".

Under "fan[x].mbAddr", enter the Modbus

address of the respective fan as a start value

(1 ≤ x ≤ "FAN_MAX"; 0 serves as a

placeholder for the HMI display "Fan view").

Open the DB "Tags".

Enter the actual number of fans under

"ebmPapst".lastFan. The actual value is

limited by the FB "EbmPapst" to 1 ≤ lastFan ≤

"FAN_MAX".

4.3.3

Downloading the controller project part

Table 4-6

No.

If changes have been made, save and compile

the project.

Select the program folder of the S7-1200 and

transfer the program into the controller by

clicking the "Download to device" option.

Select the option "Start module" in the "Load

results" under "Start modules" and complete

the loading process.

Controlling several fans (ebm-papst) via Modbus RTU

Entry ID: 109476801,

V2.0,

Action

09/2018

Remarks

see S7-1200 manual (\8\)→

Chapter 15.2