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Input Circuits 37
HP289
Switch Settings
The following switch settings are recommended for different input
signal types.
Input Signal Type Input Terminals Switch Settings
CH1
(+) (-) 1 2 3 4 5 6 7 8
a. Logic Signal,
CMOS, Pulse
9 8 off off off off on off off off
b. Open Collector or
Reed switch
9 8 off off off off on off on off
c. Namur Proximity
(set DC out to 8
volts)
11 9 off off on on on off off off
d. Switch or Reed
Switch with
debounce circuit
(200Hz max)
9 8 off off off off on off on on
e. Coil (20mV P-P
minimum)
9 8 off on off off off off off off
f.. Coil (low
Impedance;
22mV pp
minimum)
9 8 on on off off off off off off
General Specification
Switching Threshold: 2.5 Volts (except for input type c, e, and f)
Maximum Input Voltage: 50V peak
Input Impedance:
Input type a: 100K
Input types b & d: 10K
Input type c: 1K
Input type e: 100K
Input type f: 2.4K