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Advanced Configuration Features
890USE17700 April 2004 159
Nesting The Advantys configuration software allows you to create nested reflex actions. One
level of nesting is supported—i.e., two reflex blocks, where the result of the first
block is an operational input to the second block.
When you nest a pair of blocks, you need to map the results of both to the same
action module. Choose the action module type that is appropriate for the result of
the second block. This may mean that in some cases you will need to choose an
action module for the first result that does not seem to be appropriate according to
the table above.
For example, say you want to combine a counter block and a compare block in a
nested reflex action. You want the result of the counter to be the operational input to
the compare block. The compare block will then produce a Boolean as its result:
Result 2 (from the compare block) is the result that the nested reflex action will send
to an actual output. Because the result of a compare block needs to be mapped to
a digital action module, result 2 is mapped to channel 4 on an STB DDO 3410 digital
output module.
Result 1 is used only inside the module—it provides the 16-bit operational input to
the compare block. It is mapped to the same STB DDO 3410 digital output module
that is the action module for the compare block.
Instead of specifying a physical channel on the action module for result 1, the
channel is set to none. In effect, you are sending result 1 to an internal reflex buffer
where it is stored temporarily until it is used as the operational input to the second
block. You are not really sending an analog value to a digital output channel.
result 1
enable
operational input
falling-edge counter
counter direction
counter preset
reset
first nested action
action module: STB DDO 3410
channel: none
result 2
enable
operational input
less than threshold compare
threshold +/-
∆
second nested action
(result 1)
action module: STB DDO 3410
channel: 4