Security information......................................................................................................................................9

What is a Compact Field Unit? ...................................................................................................................11

Product overview ........................................................................................................................................17

3.1

Inclusion in the automation environment................................................................................17

3.2

Overview of the components..................................................................................................18

3.3

Front view of the CFU ............................................................................................................20

3.4

2D matrix code (QR code / EAN code) ..................................................................................21

Operation planning .....................................................................................................................................23

4.1

Rules for the operation...........................................................................................................23

4.2

CFU PA: Overview of the interfaces ......................................................................................24

4.3

CFU DIQ: Overview of the interfaces.....................................................................................25

4.4

"Counter" and "Frequency measurement" operating modes .................................................26

4.5

CFU PA: PA profiles for field devices on PROFIBUS PA ......................................................27

4.6

CFU PA: Voltage relationships (galvanic isolation)................................................................28

4.7

CFU PA: Functions of the fieldbus connections (FB).............................................................28

4.8

System change during operation ...........................................................................................28

4.9

Use in hazardous areas .........................................................................................................29

Operating modes and functions..................................................................................................................35

5.1

Actuator shutdown .................................................................................................................35

5.2

Introduction to counting and frequency measurement ...........................................................36

5.3

Counting.................................................................................................................................37

5.3.1

Gate control............................................................................................................................39

5.3.2

Counter in operation (startup and stop) .................................................................................40

5.3.3

Reaction to violation of the high counting limit .......................................................................41

5.3.4

Behavior when the comparison value is reached (status bit STS_DQ and output DQ) .........41

5.3.5

Loading the count value .........................................................................................................44

5.4

Measure frequency ................................................................................................................45

Installation ..................................................................................................................................................47

6.1

Installation rules .....................................................................................................................47

6.2

Installing the mounting rail .....................................................................................................48

6.3

Installing the CFU...................................................................................................................50

6.4

Removing the CFU.................................................................................................................52

SIMATIC CFU

Commissioning Manual, 08/2019, A5E39252870-AD