Allocation request and allocation status
● The allocation requirements are defined in the master data library under "Shared
Declarations > Enumerations > ES_AcquireTypes".
The following table describes the available allocation requests sorted by their priorities.
The lowest priority is at the top.
Allocation request
(Type according to
ES_AcquireTypes)
Priority Network
share
Description
No request (NoRequest) 0 - Default value of the allocation variable
Is also used to withdraw an allocation request.
Preliminary (wait)
(PrelimWait)
1 Implicit Similar to "Wait", only with implicit release in a
subsequent, higher-level allocation request.
Preliminary (now)
(PrelimNow)
2 Implicit Allocation must be immediately successful or it
fails. Implicit release for a subsequent, higher-
level allocation request.
Wait
(Wait)
3 Explicit If no immediate allocation is possible, there is a
wait for the release.
If the passed wait time is zero, the wait may last
indefinitely.
This allocation request fails when a wait time
greater than zero has been configured and this
time has expired.
Explicit release required.
Immediate
(Now)
4 Explicit Allocation must be immediately successful or it
fails.
Explicit release required.
Takeover
(TakeOver)
5 Implicit With the same allocation identifier (for example,
unit name), an immediate change of ownership
takes place. With regard to errors and wait time;
otherwise like the "Wait" type.
Force (safe)
(ForceSafe)
6 Explicit Once the equipment module (EM) to be alloca‐
ted is at an end position (IDLE, ABORTED, etc.
– ORing possible as well) that can be deter‐
mined by parameter, it changes ownership.
Force (now)
(ForceNow)
7 Explicit Immediate, unconditional change of ownership
by the requesting object.
● The allocation states (plural) are defined in the master data library under "Shared
Declarations > Enumerations > ES_AcquireStates".
The following table describes the available allocation states.
Allocation status Comment
Idle Free
Equipment module (EM) is available.
Owner Owner
Allocation has succeeded.
Appendix
7.1 Allocation request and allocation status
SFC Visualization (V9.0)
88 Programming and Operating Manual, 05/2017, A5E41356392-AA
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