Instruction manual

Integer Compares
890USE18300 September 2003 67
Enable Input An outside-the-window integer compare block can be enabled either by a Boolean
1 or an always enabled constant. It can be disabled by a Boolean 0 or an always
disabled constant.
If the enable input is a Boolean, it may be produced by:
a digital input from a module on the island
a digital output from the virtual module (See The Virtual Module, p. 28)
an output on the action module (See Using the Action Module as an Input to a
Block, p. 32) written to by the fieldbus master
When the enable input is a Boolean 0 or an always disabled constant, the block is
disabled—the action does not execute and the output is frozen in the state it was in
when the block became disabled. The block continues to process inputs but does
not act on them. If the block becomes enabled, it immediately begins acting on the
latest set of inputs received.
Thresholds Outside-the-window compares require two threshold values, which define the upper
and lower bounds of the window. Each TH value needs to be a signed integer in the
range -32 768 to +32 767. TH 1 defines the lower boundary of the window; TH 2
defines the upper boundary.
Operational
Input
An outside-the-window compare block uses one operational input. It must be a word
with an integer value in the range -32 768 to +32 767. The input can come from:
an analog input from a module on the island
an analog output from the virtual module
if the outside-the-window compare is the second block in a nested reflex action
(See Nesting Two Reflex Blocks, p. 36), the operational input may be configured
as the output of the first reflex block
Note: The value of TH 2 must be greater than the value of TH 1.