HYDAC CMU 1000 - Manual (Page 85)

Condition Monitoring Unit CMU 1000 Page 85
Revised 17.12.2009 HYDAC ELECTRONIC GMBH Mat.-No.: 669749
Additional points for sequency controls in the CMU
The two interrelated function components Sequency and Transition can be used to
implement the functionality of sequency controls or finite state machines.
7.2.11 Sequency
The Sequency component has a numerical output. This represents
the current state of the sequency. At the same time, a number is
allocated to all states. The term 'sequency' has been taken from
control engineering. Typically several steps are completed one
after the other in a sequency. Branches and backward jumps are
however possible. A sequence can adopt several states which are
numbered in ascending order starting at "0". "0" is always the state
following switch-on. A change in state is always triggered by a
transition
.
Inputs: -
Outputs: y: (Numerical)
Parameters: -
-
7.2.12 Transition (in the field "Result values / Actions")
The Transition component serves to bring about a change from one
state to another in a sequency. A transition has a Boolean input
and has 4 parameters.
Inputs: x: (Boolean)
Outputs: -
Parameters: p
1
: Sequency
Name of the related sequency in the application
program
p
2
: Current state
Number of the state while the input condition is
scrutinized.
With the "ignore" setting, the current sequency state is
ignored, i.e. the input condition is continually
scrutinized, irrespective of the current state of the
sequence.
p
3
: Successor state
• S
tate which is adopted once the input condition occurs.
p
4
:
Dwell time [s]
Indicates how many seconds the sequency must be in
the current state before the input condition is
scrutinized for the successor state.
For one sequency, several transitions with identical current and
successor states but with differing input conditions can be used in
the application program. This enables branching into different
sequency cascades within a sequency.