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1-4
Series
505 High Speed Counter
and Encoder Module User
’
s Manual
1.2 Inputs
The
HSC module has two independent channels. Each channel has four
inputs.
Reset
Inhibit
T
wo counter inputs
Each input may be used as either sinking or sourcing (with external 5–24
VDC power supply). The input signals are connected to the field wiring
terminal block on the front bezel.
Counter Inputsą
Each channel has two counter inputs — Input A and
Input B.
Reset
Current flow through the reset input sets the channel’
s counter to
zero. The counter will be held at zero until the reset input becomes
inactive.
Inhibitą
Current flow through the inhibit input inhibits the channel from
counting. The counter holds at the last value and does not change until the
inhibit input becomes inactive.
NOTE:
When in the pulse counter mode, if the A or B input is in a
different state at the beginning and end of an inhibit signal, the count will
change according to the normal counting logic. If both A and B inputs are
in different states, the change may be as much as two counts.
NOTE:
There are also software reset and inhibit functions. See Section 3.