Unipulse M252A Specifications Page 57

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5. Optional interface
46
A signal is inputted to the signal input circuit by short-circuiting or opening the input terminal and the
COM terminal. Short-circuiting is effected by means of a contact (such as a relay or a switch) or a
noncontact (such as a transistor or an open-collector TTL).
Input equivalent circuit
TTL open collector output
*
IC=0.5mA
IN
short-circuited when IN is ‘H’
toggle
relay
transistor
IN
approx.
Logic Negative Positive
Open OFF ON
Short ON OFF
Vcc
inside
COM
push
switch
+5V
1
outside
M252A
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