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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
Date: 18.04.23File:ST-PCS7SYS_sfc.2
SIMATIC PCS 7Siemens AG 2003. All rights reserved.
SITRAIN Training for Automation and Drives
Overview
Menu bar
START
END
S1
S2 S3
S4
T1
T2
T3
T4
S1...S4 StepsT1...T4 Transitions
Step symbols
Date: 18.04.23File:ST-PCS7SYS_sfc.3
SIMATIC PCS 7Siemens AG 2003. All rights reserved.
SITRAIN Training for Automation and Drives
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
Date: 18.04.23File:ST-PCS7SYS_sfc.4
SIMATIC PCS 7Siemens AG 2003. All rights reserved.
SITRAIN Training for Automation and Drives
Action and Transition
Step active
Transition fulfilled
Cycles ->
Cycles ->
Date: 18.04.23File:ST-PCS7SYS_sfc.5
SIMATIC PCS 7Siemens AG 2003. All rights reserved.
SITRAIN Training for Automation and Drives
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
Date: 18.04.23File:ST-PCS7SYS_sfc.6
SIMATIC PCS 7Siemens AG 2003. All rights reserved.
SITRAIN Training for Automation and Drives
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
Date: 18.04.23File:ST-PCS7SYS_sfc.7
SIMATIC PCS 7Siemens AG 2003. All rights reserved.
SITRAIN Training for Automation and Drives
Date: 18.04.23File:ST-PCS7SYS_sfc.8
SIMATIC PCS 7Siemens AG 2003. All rights reserved.
SITRAIN Training for Automation and Drives
SFC Operating Mode Logic
Command buttons for
SFC Test
Date: 18.04.23File:ST-PCS7SYS_sfc.9
SIMATIC PCS 7Siemens AG 2003. All rights reserved.
SITRAIN Training for Automation and Drives
SFC - Operational Sequence
M
Cy
cle
of
SF
C
Cy
cle
of
CF
C
Date: 18.04.23File:ST-PCS7SYS_sfc.10
SIMATIC PCS 7Siemens AG 2003. All rights reserved.
SITRAIN Training for Automation and Drives
External View of SFC
Date: 18.04.23File:ST-PCS7SYS_sfc.11
SIMATIC PCS 7Siemens AG 2003. All rights reserved.
SITRAIN Training for Automation and Drives
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
Date: 18.04.23File:ST-PCS7SYS_sfc.12
SIMATIC PCS 7Siemens AG 2003. All rights reserved.
SITRAIN Training for Automation and Drives
Notes
Date: 18.04.23File:ST-PCS7SYS_sfc.13
SIMATIC PCS 7Siemens AG 2003. All rights reserved.
SITRAIN Training for Automation and Drives
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
Date: 18.04.23File:ST-PCS7SYS_sfc.14
SIMATIC PCS 7Siemens AG 2003. All rights reserved.
SITRAIN Training for Automation and Drives
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!
Date: 18.04.23File:ST-PCS7SYS_sfc.15
SIMATIC PCS 7Siemens AG 2003. All rights reserved.
SITRAIN Training for Automation and Drives
Hold Sequencer with Data Block for Values to be Saved
"Normal" reactor sequencer
END(restore)
NOT_HOLD
START(save)
Date: 18.04.23File:ST-PCS7SYS_sfc.16
SIMATIC PCS 7Siemens AG 2003. All rights reserved.
SITRAIN Training for Automation and Drives
Preprocessing and Postprocessing for Sequencers
Possible for every
single sequencer
Date: 18.04.23File:ST-PCS7SYS_sfc.17
SIMATIC PCS 7Siemens AG 2003. All rights reserved.
SITRAIN Training for Automation and Drives
Creating an SFC Type
Several sequencers possible for
one SFC type
Date: 18.04.23File:ST-PCS7SYS_sfc.18
SIMATIC PCS 7Siemens AG 2003. All rights reserved.
SITRAIN Training for Automation and Drives
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
Date: 18.04.23File:ST-PCS7SYS_sfc.19
SIMATIC PCS 7Siemens AG 2003. All rights reserved.
SITRAIN Training for Automation and Drives
Miscellaneous Reference Data
Run Sequence