Table of contents
1 Security information......................................................................................................................................9
2 What is a Compact Field Unit? ...................................................................................................................11
3 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
4 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
5 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
6 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 3
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