Range comparators 1–8 control eight hardware outputs every 500
s using one ON
preset, one OFF preset and two pulse timers (TIMER1, TIMER2) per output. Range
comparator faceplate outputs 1–4 are always available. The four faceplate hardware
output terminals used by range comparators 5–8 are shared by input points 9–12. A
%Q bit is provided as an output enable for each configured hardware output.
In order for a hardware output to operate, the associated %Q Output
Enable bit must be ON.
The status of each range comparator output is reported to the PLC using a %I bit. If a
hardware output is not configured for a range comparator, the %I status bit is still
updated. This feature allows PLC logic to perform bit operations using range
comparator 5–8 status even if the associated hardware output terminal is used as an
Range comparators 1–8 can be configured to operate in one of two modes:
mode, the range comparator output operates as follows
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