User manual

User Manual
man_905K_1.10.doc Page 31
⊂
GND
905U-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
905K module, external isolation such as a relay may be required for surge protection.
3.5.2 Shaft Encoder Connections
⊂
⊂
⊂
COUNT
DIRECTION
GND
DIN2
DIN1
905U-K
⊂
⊂
⊂
PHASE 1
PHASE 2
GND
DIN2
DIN1
905U-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 .
⊂
⊂
GND
AI-
905U-K
⊂
LOOP POWERED TRANSDUCER
⊂
⊂
⊂
+
-
AI+
ANALOG
SUPPLY
Each input has a loop resistance of 150Ω and zener diode protection against overvoltage and
reverse voltage.
⊂
+
-
AI+
905U-K
⊂
VOLTAGE INPUT
AI-
⊂
⊂
GND