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3 Mode of Operation

Name

P type

error

OUT

errorStatus

OUT

fanNumber

IN_OUT

req

IN_OUT

dataPtr

IN_OUT

manual

IN_OUT

The FC "ReadWrite" was made to resemble the instruction "Modbus_Master" and

places the manual register access to the last position of the data transfer of FB

"EbmPapst" that is to be processed cyclically.

Execution of the FC "ReadWrite" may hence be delayed by max. 400 ms * number

of fans to be addressed ("lastFan").

Note

For a more detailed description of the communication instructions

"Modbus_Comm_Load" and "Modbus_Master", see the STEP 7 V15 online help

or the chapter

3.5.1

Mode of operation

The function mechanism is demonstrated at the example of "reading the 6 holding

registers starting from address 16#D108 of fan no. 2" in

Figure 3-5

FC „ReadWrite"

Controlling several fans (ebm-papst) via Modbus RTU

Entry ID: 109476801,

V2.0,

Data type

FC "ReadWrite" was completed with errors (active for one

Bool

cycle)

Status evaluation (error code) of FC "ReadWrite"

Word

USInt

Fan to be addressed

(is limited by the FC: 1 ≤ fanNumber ≤ lastFan)

Request of manual access via FC "ReadWrite" (is reset after

Bool

completion)

Array[0..8] of

Data buffer with the values to read or write

UInt

PLC data type to exchange data with the FB "EbmPapst"

"typeManual"

"Modbus RTU"

in the S7-1200 system manual (\8\).

InOut „manual"

req

done

09/2018

Comment

Figure

3-5.

FB „EbmPapst"

Index

Cyclic

[fan

Index]