Advantech PCI-1220U, User Manual, Page: 45 / 56

39 Appendix A
A.2 Digital Input/Output
A.3 Input Pulse for Encoder Interface
Input Signals Over Traveling
Limit Switch
Input* nLMT+, nLMT-
General Input
Signal* nIN0~1
Input Signal for
Servo Motor
Drives* nALARM (servo alarm); nINPOS
(position
command completed)
Emergency Stop EMG - one emergency stop input
Max. Input
Frequency 4 kHz
Input Voltage
(VEX = 24V)
(Support dry/wet
contact) Logic 0 21~24 V
DC
; open(dry
contact)
Logic 1 0~16 V
DC
; closed (dry
contact)
Protection 2,500 V
DC
photo coupler isola-
tion
General Purpose
Output Output Signal* nOUT0 ~ 3
Output Voltage Open Collector 5 ~ 40 V
DC
Sink Current 200 mA max./channel
Protection 2,500 V
DC
photo coupler isola-
tion
Input Signals nECAP/N, nECBP/N, nEZ+, nEZ-
Encoder Pulse Input Type Quadrature (A/B phase) or Up/Down
Counts per Encoder Cycle x1, x2, x4 (A/B phase only)
Max. Input Frequency 1 MHz
Input Voltage Low 0 ~ 2 V
DC
High 5 ~ 30 V
DC
Protection 2,500 V
DC
Isolation Protection