Representation as state machine step 1
The requirements described above are shown in the following diagram as a state machine. It
must be considered that the state must be initialized first when the ACU is switched on (or in
the case of a reset). In this example, initialization is performed in order to switch to the correct
state. At first, the initiators are evaluated. If one of the initiators signals that the position has
been reached, the corresponding state is activated. If no initiator signal is present, the lower
position is approached.
Travel
up
Initiator
bottom
Position
top
Door open
top
Position
bottom
Travel
down
Lower lamp on
Drive stopped
Warning
signal
Lower lamp off
Drive start
(up)
Upper lamp off
Drive start
Upper lamp on
Drive stopped
Initiator top
reached
Toggle switch
bottom
(down)
Initializing
Initiator bottom
reached
Initiator
top
No
Initiator
bottom
Toggle switch
top
Warning
signal
Door open
Representation as state machine step 2
The events and actions are assigned to the digital signals of the ACU. At first, the signals are
linked to the input and output buffer. An EM-IO-03 extension module is available.
Function ACU Input buf-
fer
Output
buffer
toggle switch (top/bottom) S5IND (1/0) 2005
top position initiator (reached/not
reached)
S4IND (1/0) 2004
bottom position initiator (reached/not
reached)
S2IND (1/0) 2002
door open (open/closed) S3IND (1/0) 2003
bottom LED (on/off) S1OUTD (1/0) 2401
top LED (on/off) S3OUTD (1/0) 2402
bottom position door lamp (on/off) MFO1D (1/0) 2403
top position door lamp (on/off) EM-S1OUTD (1/0) 2404
start drive (up)
Start Clockwise
068
2410
start drive (down)
Start Anticlock-
wise
069
2411
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