Instruction manual

Introduction
890USE18300 September 2003 33
The action module is specified as the STB DDO 3200 output module located at
logical address 4 on the island bus (item 1 above). The physical output is mapped
to channel 1 of the action module (item 2 above).
For efficiency, you may reuse the bit in the output process image previously
assigned to channel 1 of the action module as the reset input. Functionally, this
means that the fieldbus master will be able to reset (stop) the timer accumulator by
writing a value of 0 to that data bit in the output process image. To make this happen,
select Action Module from the Reset input pull-down list box (item 3 above), then
select Channel 1 as the Reset input channel.
Selecting None
as the Physical
Output Channel
In the two examples above, you always selected a channel (1, 2, 3, etc.) along with
the action module as the physical output from the reflex action. Among the channel
options in the pull-down list box is the entry None. Select this entry only when the
action block you are configuring is the first block in a nested reflex action (See
Nesting Two Reflex Blocks, p. 36).
When you select None as the physical output channel, the output from the block
goes to a temporary storage buffer, and it can be used as an input to the second
block in the nested reflex action.