17 2TLC172001M0211_A
4.4 Counter inputs Pluto D45
For Pluto D45 the inputs IA0 – IA3 can be configured as counter inputs (pulse counting) which
work for frequencies up to 14000 Hz. As counter inputs IA0 – IA3 can be used in two ways, Up
counting or Up/Down counting.
4.4.1 Up count
When the input is configured for Up count Pluto counts the pulses on the input. Via a function
block the user gets the pulse rate which for example can represent a speed. The sensor is
typically a proximity switch or photocell. For description of the use of Function blocks see Pluto
Programming Manual.
IA0 µA
µB
+24V
Pluto
IA4
µB
µB
µA
IA1
IA3 µA
µA
µB
0V
+24V
0V
T
R
Example of sensor solution for speed monitoring. The sensors can for example be proximity switches or
photocells.
Any of the inputs IA0..IA3 can be used.
Configuration of counter input
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