User Manual v1.9
Manual
WI-I/O 9-K
v1.9
Page 31
3.5
Input Signal Connections
3.5.1
Digital/Pulse Inputs
Digital and pulse inputs share the same input channel. Each input is connected between the DIN
connector and COMMON. Inputs can be voltage-free contacts, NPN transistor switches, or a
TTL voltage signal (ON < 1.5 volt DC, OFF > 3.5 volts DC).
⊂
GND
WI-I/O-K
DIN1
⊂
⊂
DIN2
Inputs can be voltage free contact or
open-collector transistor
NPN
Inputs do not have any surge protection. If the sensor or switch is mounted a long way from the
WI-I/O K module, external isolation such as a relay may be required for surge protection.
3.5.2
Shaft Encoder Connections
⊂
⊂
⊂
COUNT
DIRECTION
GND
DIN2
DIN1
WI-I/O -K
⊂
⊂
⊂
PHASE 1
PHASE 2
GND
DIN2
DIN1
WI-I/O-K
INCREMENTAL SHAFT ENCODER
QUADRATURE SHAFT ENCODER
3.5.3
Analog Input
Current (mA) Input
The analog input has a positive and a negative terminal, and may be placed at any point in the
current loop, as long as neither input rises more than 27V above COMMON or ground. An
internal DC/DC converter provides 24 VDC 50mA supply for powering analog loops .
