Date: 02.06.2015 File:ST-PCS7SYS_sfc.1 SIMATIC PCS 7 Siemens AG 2003. All rights reserved. SITRAIN...

Date: 18.04.23File:ST-PCS7SYS_sfc.1

SIMATIC PCS 7Siemens AG 2003. All rights reserved.

SITRAIN Training for Automation and Drives

Configuring Sequences with SFC




Overview

Menu bar

START

END

S1

S2 S3

S4

T1

T2

T3

T4

S1...S4 StepsT1...T4 Transitions

Step symbols




Sequence Structures

S1

T12

S2

T23

Linear

S21S22

T23

T12

Parallel

S2 S3

T12 T13

T24 T34

Alternative

S2 T2

T23

Loop

S4S3S3

S1 S1

T12

S1

S2

T2

T23

Jump

S3

T12

S1

S3




Action and Transition

Step active

Transition fulfilled

Cycles ->

Cycles ->




Operating Mode Logic for a Given Sequence Control

Step Control Modes

T with TransitionT or C with Transition or Confirmation by UserT and C with Transition and Confirmation by UserC with Confirmation by User T/T and C with Step specific Confirmation by operator

Operating modes

Operator commands




Exercise: Sequence Control - Temperature

START

L<33

SP=70

H>67

SP=50

L<53

SP=30

L<32

END

70

50

30

SP_EXT

PV_IN

t

Step enabling condition:Process value PV_IN less than 33?

Step enabling condition:Process value PV_IN greater than67?

Action:Set setpoint SP_EXT to 70

• Linear sequence

• Conditions in transitions

• Actions in steps

• Test

Start step




SFC Operating Mode Logic

Command buttons for

SFC Test




SFC - Operational Sequence

M

Cy

cle

of

SF

C

Cy

cle

of

CF

C




External View of SFC




Sequence Control - Reactor

Move to basic position- Reactor C empty and cold

First component X fill up to Level 20 %

Speed MonitorMixer on

Speed Monitor Mixer on

Level >= 80%

Core temperature 90 Degr.

Process temp reached

Settle Time 2 Min

Open drain valve, mixer off, shut down temperatur controller

Second component Y fill

up to level 80 %End step

Level >= 20%

cold and empty

Tolerance Temp controller reached

End Basic pos. reactor empty + cold




Notes




Exercise: Modification to Reactor Sequence Control

Move to basic position- Reactor C empty and cold

First component X fill up to Level 20 %

Speed MonitorMixer on

Speed Monitor Mixer on

Level >= 80%

Core temperature 90°

Process temp reached

Settle Time 2 Min

Opendrain valve, mixer off, shut down temperature

controller

Second component Y fill

up to Level 80 %End step

Level >= 20%

cold and empty

Tolerance Temp controller reached

End Basic pos. reactor empty + cold




Exercise: Adding a Second Sequencer to the Sequential Control

Transitionmain-sequence

Transitionhold-sequence

DB

SFC_ReacC

Ensure state

Safe stateCommand outputSet operating modes foroperation

Restore state

HOLD!




Hold Sequencer with Data Block for Values to be Saved

"Normal" reactor sequencer

END(restore)

NOT_HOLD

START(save)




Preprocessing and Postprocessing for Sequencers

Possible for every

single sequencer




Creating an SFC Type

Several sequencers possible for

one SFC type




Creating an SFC Instance

Operating Modes

Commands

Command enable

Interlock

Control strategiesStep Control Mode

Operation Options

Operating Mode

Operating Mode

Group Display

Error Display

Control strategies




Miscellaneous Reference Data

Run Sequence

Date: 02.06.2015 File:ST-PCS7SYS_sfc.1 SIMATIC PCS 7 Siemens AG 2003. All rights reserved. SITRAIN...

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Transcript of Date: 02.06.2015 File:ST-PCS7SYS_sfc.1 SIMATIC PCS 7 Siemens AG 2003. All rights reserved. SITRAIN...