Siemens SIMATIC S7-1200 Handmatig - Pagina 18

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3 Mode of Operation

Program workflow

Figure 3-3

Index

Acyclic

The sequence for reading the input registers of each fan is processed cyclically as

a function of the running index "IndexCyclic". The information (access mode

"mode", register address "addr" and register length "len") are provided as start

values in the interface parameter "cyclic" in the field 0 to 7.

The following is written into the last field ("cyclic.last") via the HMI depending on the

request ("read", "readAll" or "write"):



the holding register to read (provided in the interface parameter "read")



the sequence for reading the acyclic registers as a function of the running

index "IndexAcyclic" (provided in the interface parameter "acyclic")



the holding register to write to (provided in the interface parameter "write")

The field ("cyclic.last") is only processed if the data length "len" is greater than zero.

Based on the running index "IndexCyclic", the information is transferred to the

static placeholder "statDataAct" and handed to the communication block

"Modbus_Master".

The system block "Modbus_Master" provides the interface for exchanging data with

the ebm-papst fans via Modbus RTU.

The 9-word field "dataPtr" in the static parameter "statModbusMaster" functions as

a data buffer for the read values/the values to write. It is limited to 9 words due to

the permitted maximum telegram length of the fan.

Controlling several fans (ebm-papst) via Modbus RTU

Entry ID: 109476801,

V2.0,

shows the schematic structure of the FB "EbmPapst".

read

readAll

write

09/2018

Index

Cyclic

read

mode

= 0

mode

Index

= 104

Fan

Index

Read

Index